1861.] DR- T. s. cobbold's list of entozoa. 123 



16. Strongylus acuticaudatus, Cobbold. (PI. XX. f. 5, 6.) 

 Caput angustatum obtusum, nudum ; corpus Jlexuosum, compres- 



siusculum ; bursa maris biloba, subterminaliy magna, lobo sin- 

 gula quinqueradiato ; extremitate caudali maris acuta; cauda 

 femincB subulata recta, apice acuminata. 



Longit. mar. ^-|, fem. ^, crassit. -^^ unc. 



Numerous examples in the caeca of Chloephaga poliocephala, asso- 

 ciated with the foregoing. 



17. Strongylus spiculatus, Cobbold. (PL XX. f. 7, 8.) 

 . Ascaris strongylina, Rudolphi, Dujardin, Diesing. 



Caput conicum, nudum ; corpus cequale, Jlexuosum ; bursa maris 



biloba, lobis jlabellatim multiradiatis ; extremitate caudali 



maris longe spiculata, parum inflexa ; cauda femincB subulata, 



recta. 



Longit. mar. et fem. | unc. 



Numerous specimens in the intestines of a species of Tinamou 



(Tinatnus ?). Ex. Feb. 16, 1859. Natterer found it at Brazil 



iu T. tataupa and Perdix dentata. 



18. Ascaris lineata, Cobbold. 



Caput nudum, conicum; os labiis indistinctis ; corpus utrinque • 

 eequaliter attenuatum, rectum ; extremitate caudali femince 

 obsusata. 

 Longit. 1|, crassit. ^^y- unc. 



One female specimen only in the intestines of an AUigator (Alliga- 

 tor mississippiensis), evidently not referable to A. tenuicollis, but 

 probably distinct. Ex. Dec. 25, 1860. 

 Cab. Coll. T.S. C.no. 93. 



Larval, immature, and doubtful forms of Nematodes. 



19. FiLARIA COLUBRI AMERICANI. 



In a cyst within the walls of the small intestine. Ex. Feb. 20, 

 1857. 



20. FiLARIA COLUBRI BLUMENBACHII. 



Enclosed in a cyst in the muscular substance of the heart. Ex. 

 Jan. I,;i858. 



Note. Linn. Trans, xxii. p. 366. t. 63. f. 30. 



21. FiLARIA ARDE.E NYCTICORACIS (in OVo). 



I have thought it worth while to notice under this head some very 

 peculiar encysted ova, whose chitinous shell or chorion consists of 

 regularly disposed coils like those described by Claparfede in the eggs 

 of Ascaris spirotheca, which infests the intestines of Triton tceniatus*. 



Some genetic relation may subsist here. The cysts were nume- 



* Claparede, ' De la formation et de la fecondation chez les vers nematodes. 

 Geneve, 4to, 1859. 



