142 NEW YORK ZOOLOGICAL SOCIETY. 
after infection, and at the end of seven weeks they measured 
15 m.m. The scolex is well developed at 45 days, possessing a 
double row of hooklets like the Taenia solium, but are more nu- 
merous, 34-38, slender, and root of the hooklets longer than those 
of the latter, and the blades less curved. The different habitat, 
larger size of cyst, number of hooklets, and the long, slender 
neck of the Cysticercus tennicollis are the best guides for distin- 
guishing this cysticercus from the Taenia soliwm, with which it 
might be confounded. While the peritoneum and pleura are by 
far the most frequent habitats of this species of hydatid it has 
been found in liver, lungs, and heart muscle. They may be found 
attached to the surface of the liver, or to the adipose tissue of 
the mesentery or omentum. The number varies from several, 
which were found in a mule deer, to over 100 found in another 
mule deer. In several instances I found the hydatid shriveled 
up and undergoing caseous degeneration, but on microscopic 
examination I could distinguish numerous free hooklets. 
Two cases of cysticerci are, I think, of sufficient interest to 
warrant a brief summary of the autopsies. In both instances 
two mule deer were the infected animals, arriving at the Park 
together, and obtained from the same source. 
Autopsy on Case No. 1; Mule Deer (Female).—Greatly ema- 
ciated, visible mucous membranes anemic; abdominal cavity 
contained about 3 pints straw-colored serous fluid, without in- 
flammatory coagula. Abdominal surface of diaphragm almost 
wholly covered with hydatids varying in size from a pea to a 
walnut, several of them being fully 34 inch in diameter. The 
scolex seen through the walls and fluid of the cyst as a pearly- 
white spot. The size of the scolex varied according to the size 
of the cyst. The hydatids were more numerous upon the ten- 
dinous portion, but there were eight upon the fleshy part; on the 
thoracic surface of the diaphragm there were six of the largest 
cysts; the smallest about the size of a hazel-nut. Upon the peri- 
cardium—that portion covering the apex—were three large cysts, 
none appearing in the muscle of the heart excepting two small 
ones on the surface of the right appendix auricule along its outer 
serrated border. On the gastro-splenic and gastro-hepatic omen- 
tum were numbers of scattered cysts, but the greatest collection 
was the group upon the gastro-colic omentum, where great 
masses of these cysts were found hanging in clusters, reminding 
one of grapes. The accompanying picture shows a small portion 
of this omentum. 
