A, View of the heart of a dog infested with Filaria immitis Leidy; the right ventricle and base of the pulmonary artery have been opened: a, aorta; b, pulmonary artery; c, vena cava; d, right ventricle; e, appendix of left auricle; f, appendix of right auricle.
The essential feature of the asymmetry of Gastropoda is the atrophy or disappearance of the primitively left half of the circumanal complex (the right half in sinistral forms), including the gill, the auricle, the osphradium, the hypobranchial gland and the kidney.
D, The branchial efferent vessel carrying aerated blood to the auricle, and here interrupting the circlet of gill lamellae.
The heart in Patella consists of a single auricle (not two as in Haliotis and Fissurella) and a ventricle; the former receives the blood from the branchial vein, the latter distributes it through a large aorta which soon leads into irregular blood-lacunae.
Heart has only a single auricle, neither heart nor pericardium traversed by rectum.
No ctenidium, but a pulmonary cavity; heart with a single auricle, not traversed by the rectum.
The heart c lying in the pericardium is seen in close proximity to the renal organ, and consists of a single auricle receiving blood from the gill, and of a single ventricle which pumps it through the body by an anterior and posterior aorta.
X, Auricle of the heart.
H, The heart (auricle and ventricle).
When the pericardium is cut open from above in an animal otherwise entire, the anterior face of the kidney is seen forming the posterior wall of the pericardial chamber; on the deep edge of this face, a little to the left of the attachment of the auricle to the floor of the pericardium, is seen a depression; this depression contains the opening from the pericardium into the kidney.
The heart lying within the adjacent pericardium has the usual form, a single auricle and ventricle.
Six or seven species of mosquitoes are also the intermediate hosts of Filaria immitis, which infests the right auricle and pulmonary artery of the dog, and occurs throughout the tropics, in southern Europe, the United States of America, and elsewhere.
Aperture by which the left auricle joins the ventricle.
The afferent vessel of the' ctenidium receives blood from the vena cava or principal blood-sinus of the body, the efferent vessel opens into the auricle of its own side.
On either side of the ventricle, in the primitive condition, is a thinwalled auricle, opening into the ventricle by a valved opening.
Each auricle forms the terminal enlargement of the efferent vein of the ctenidium of its own side.
In the majority of Gastropoda one gill and one auricle are lost.
B, buccal mass; m, retractor muscles of the buccal mass; ov, ovary; od, oviduct; i, coils of intestines; ao, aorta; c', left auricle; c, ventricle.
A form of contraction intermediate in character between the tonic and the rhythmic is met in the auricle of the heart of the toad.