DESCRIPTIONS OF NEW INTERNAL PARASITES 



By Edward A. Ciiapin 



0/ the Bureau of Animal Induslnj, United States Deparlmenl of Agriculture 



Among the collections made by Dr. Alexander Wetmore, while a 

 member of the U. S. S. Tanager Expedition of 1923 imder the joint 

 auspices of the Biological Survey, United States Department of 

 Agriculture, and the Bishop Museum of lionohilu, were two lots 

 of nematodes and one of ccstodes, representing as many species. 

 Both of the nematode species proved to be now to science and are 

 herewith described. According to Doctor Wetmore, ail of the monk 

 seals {MonacJcus schauinslandii) which were examined for parasites 

 had nematoda in abundance within the stomach. Owing to the 

 exigencies of the situation, it was difhcult to preserve parasitic 

 material and only samples were obtained. He also says that, so far 

 as his memory serves, the wall of the stomach of a parasitized 

 animal did not show ulcers. This condition indicates that there 

 may be a division of the genus Contracaecum into ulcer-forming and 

 non ulcer-forming species just as there is in the genus Ileierakis. 



NEMATODA 

 FAMILY ASCARIDAE , 



CONTRACAECUM TURGIDUM, new species 



Male: Length 45 mm., gi-eatest diameter L8 mm., near the middle 

 of the body length. Lips large and nearly quadrate, subequal, 210fx 

 high. Dorsal lip bears two double papillae, each subventral lip with 

 a single double papilla. Interlabia comparatively large; those adja- 

 cent to the dorsal lip carry the amphids which appear in transverse 

 section as circular spaces. Excretory pore opens at the base of the 

 ventral interlabium; 75jLt behind the base of the lips is a rather deep 

 constriction, causing the anterior portion of the neck region to as- 

 sume a collarlike form. Cervical papillae oval, slightly prominent, 

 47ju behind the cervical constriction. Esophagus 6.3 mm. long. In- 

 testinal appendix six-elevenths as long as esophagus, esophageal ap- 



NO. 2603.-PROCEEDINGS U. S. NATIONAL MUSEUM. VOL. 68, ART. 2 

 63197— 25t j^ 



