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 Cysticcrcus tennicollis are the best guides for distin- 

 guishing this cysticercus from the Taenia solium, 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. i; Mule Deer (Female). — Greatly ema- 

 ciated, visible mucous membranes angemic ; abdominal cavity 

 contained about 3 pints straw-colored serous fluid, without in- 

 flammatory coagula. Abdominal surface of diaphragm almost 

 wdioUy covered with hydatids varying in size from a pea to a 

 walnut, several of them being fully ^ inch in diameter. The 

 scolex seen through the walls and fluid of the cyst as a pearly- 

 w'hite 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 nuiscle of the heart excepting two small 

 ones on the surface of the right appendix auriculce 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. 



