In C. nigrescens and in some other species a zooid may contain a pair of ovaries, a pair of testes, or an ovary and a testis, although the males, females and hermaj phrodites do not differ from one another in external characters.
Both right and left testes are functional.
Or one of them for the testes, and XIII for the ovaries.
The testes during development become hollowed out and are prolonged into the vasa efferentia.
The ovary and testes are heaped-up masses of red or yellow cells due to a proliferation of the cells lining the coelom.
The former consist of one pair or more of vesicular testes communicating by fine ducts with a vesicula seminalis.
The sexes are not distinct, the sexual organs being represented by a pair of testes and a single ovary, which open together into the posterior end of the alimentary canal.
The incisive foramina are large and usually confluent; the bony palate is very narrow from before backwards; there is no alisphenoid canal; the fibula is welded to the tibia, and articulates with the calcaneum; and the testes are permanently external.
Io) consist of a pair of testes (te), a pair of seminal vesicles (v), vasa deferentia (v.d.), and accessory glandular tubules (f).
Gonads limited in number of pairs, testes and ovaries always present in the same individual.
The prevalent number of testes is one pair in the aquatic genera and two pairs in earthworms. But there are exceptions; thus a species of Lamprodrilus has four pairs of testes.
These sacs contain the developing sperm cells or eggs, and are with very few exceptions universal in the group. The testes are more commonly thus involved than are the ovaries.
In Acanthobdella the testes are, however, not contained in the general coelom, and the nephridia lie in the septa.
The testes vary in numbers of pairs.
The testes reach forward to the fifth and even to the second segment, and open one each side of the anus.
The testes descend into a scrotum.
The reproductive organs, both ovaries and testes, become fused together in the middle of the body.
The testes are inguinal or abdominal.
The testes in the pairing-season form projections in the groins, but (except in the Duplicidentata) do not completely leave the cavity of the abdomen.
The male organs consist of paired testes communicating by delicate canals with a protrusible penis.
The .- trunk contains a spacious body-cavity filled during the breeding season by the swollen ovaries, and the same is true of the tail if we substitute testes for ovaries.
The two testes lie in the tail and are formed by lateral proliferations of the living peritoneal cells.
If, for instance, the testes fail to develop normally, the secretion which they discharge into the blood is abnormal in character and amount, with the result that the characters of the remotest parts of the body are more or less profoundly affected.
The paired testes extend through the greater part of the body and end in two vasa deferentia which unite with the intestine to form a cloaca.
The genital glands, ovaries and testes, are attached to the dorsal wall of the body-cavity, in the immediate vicinity of the kidneys, with which the male glands are intimately connected.
In most male batrachians the testes are drained by transverse canals which open into a longitudinal duct, which also receives the canals of the kidneys, so that this common duct conveys both sperma and urine.
The body bears tentacles, but shows no division into hydrorhiza, hydrocaulus or hydranth; it is temporarily fixed and has no perisarc. The polyp is usually hermaphrodite, developing both ovaries and testes in the same individual.
Testes and ovaries always free.
The testes are more numerous than the ovaries, of which latter there are never more than one pair.
The testes are permanently abdominal.
Among the common characters may be noted the possession of: (i) pectoral mammae; (2) abdominal testes; (3) a bifid apex of the heart; (4) bilophodont molars with a tendency to the formation of an additional lobe from the posterior part of the cingulum.
The testes are situated in a distinct sessile or slightly pedunculated scrotum, into which they descend from the sixth to the tenth month after birth.
Testes, and occasionally ovaries, enclosed in sacs.
Hermaphrodite, the ovaries and testes distinct, with separate apertures.
In Acanthobdella, however, the testes of each side of the body have grown together to form a continuous band, which extends in front of external pore.
The ovaries arise like the testes as rounded bodies in the ligament.
Entocolax, mouth at free extremity, animal fixed by aboral orifice of pseudopallium, Pacific. Entoconcha, body elongated and tubular, animal fixed by the oral extremity, protandric hermaphrodite, parasitic in testes of Holothurians causing their abortion.