1912. | E. GHosuH : The Anatomy of a Slug. 187 
and the dorsal one convex. The auricle is thin-walled and is 
smaller than the ventricle. 
Minute structure of the ventricle.—The ventricle is surrounded 
by a single layer of columnar epithelium. The muscles are arran- 
ged in various directions. The cavity of the ventricle is irregular 
and is traversed by numerous strands of muscle fibres. There is 
no epithelial lining in the cavity. 
The aorta, just after its origin from the anterior end of the 
ventricle, divides into two; one passes forwards to the buccal 
bulb, while the other curves backwards and passes beneath the 
ventral aspect of the albumen gland closely applied to it, and 
seems to enter into the substance of the ovary; it also gives 
origin to several small vessels which supply the albumen 
gland. 
The pulmonary artery (8) lies along the left side of the kidney, 
before it ends in the auricle; it receives numerous vessels from the 
kidney. 
IV..~ Kapney, (plo xxv, figs 5): 
The kidney is a flattened triangular body lying on the roof of 
the pulmonary chamber at the back. In position it lies just over 
the accessory digestive gland to the right. The surface of the 
kidney is provided with a network of vessels which open into the 
pulmonary arteries. The margins of the kidney are thinned out 
and is continuous with the membranous wall of the pulmonary 
chamber. The ureter could not be traced. 
In A. strvubellt (10), the pulmonary chamber is a more or less 
round sac with the heart placed transversely and kidney to the 
left extending over more than half of the pulmonary chamber. 
Minute structure.-—The kidney consists of a mass of tubules 
which converge to open into the ureter which seems to lie along 
the right (?) side of the kidney. The tubules are long and wavy 
with wide lumen. They are all placed side by side with thin 
layers of intervening connective tissue. The wall of the tubules 
consists of a single layer of polyhedral cells placed on basement 
membrane. The nuclei of the cells are oval, and are placed at 
the bases of the cells. 
The sections of kidneys from two specimens show numerous 
cystic bodies contained in the cells of the tubules. These cystic 
bodies, which are doubtlessly parasitic, seem to be the oocysts of a 
sporozoon. They are mostly round or oval, although many are 
irregular in shape. The wall seems to consist of a thick layer of 
cuticle which did not allow the staining fluid to penetrate into 
the interior. The cysts contain from one to six spores with 
distinct round nuclei. The spores are spherical, or facetted when 
there are more than one ina single cyst. The oocysts were too 
little advanced to show the formation of sporozoits. This 
sporozoon seems to belong to the genus K/ossza (fam. Polysporocy- 
stidae, order Coccidiidea). 
