A similar pair of coxal glands, lobate instead of ovoid in shape, was described by Lankester in Mygale, and it was also shown by him that the structures in Limulus called " brick-red glands " by Packard have the same structure and position as the coxal glands of Scorpio and Mygale.
In Mygale (figs.
Their movement in an upward or downward direction in Limulus and Mygale must exert a pumping action on the blood contained in the dorsal arteries and the ventral veins respectively.
Idem, " On the Skeletotrophic Tissues of Limulus, Scorpio and Mygale," Quart.
Lankester, " Coxal Glands of Limulus, Scorpio and Mygale," Quart.
Viii., 1884; Pelseneer, " On the Coxal Glands of Mygale," Proc. Zool.
The largest of these is the Mygale with a body 2 in.
A large Mygale found on the island of Siriba, of the Abrolhos group, feeds upon lizards, and has been known to attack and kill young chickens.
Among the venomous reptiles and insects are the rattlesnake, the Gila monster (Heloderma suspectum), a poisonous lizard, and the tarantula (Mygale Heintzii), which, however, are common only in certain places and at certain seasons.