176 DR. T. S. COBBOLD ON PARASITES COLLECTED 



DiESiNG. — Syst. Helm. vol. ii. 1851, p. 278. Denkschr. d. kais Akad. 



Wien, xiii. 1857, S. 19 (plates). Revis. d. Nemat. 1860, S. 709. 

 MoLiN. — Monogr. d. Filarien, in Sitzungsber. d. k. Akad. Wien, 



xxviii. 1858; S. 416. 

 CoBBOLU. — Catalogue of Entozoa in Museum Roy. Coll. Surg. 1866, 



p. 8. Proceed. Zool. Soe. of Lond., Nov. 1873, p. T'^l (figs.). 

 Schneider. — Monogr. d. Nemat. 1866, S. 89. 

 O. VON LiNSTOvv^. — Compend. d. Helminth. 1878, S. 126. 



2. OxTUEis OBESA, Diesing. 



In Mr. Darwin's list this species is marked " Worm from duo- 

 denum of Oavia Capyhara, floating amidst the green digesting 

 mass : Kio Plata, May 1833." The bottle contained five females. 

 The original find of this species was made by Natterer at 

 Ypaneraa, in 1819, when be obtained large quantities from the 

 caecum of a Cajiyhara. They were all females ; at least, Diesing's 

 description implies so. When in 1876 I gave some notice of 

 Mr. Darwin's find, I was not aware that Schneider had already 

 described this species. Diesing had said that the head was 

 armed with three or four prominent papillae, but Schneider 

 observed and figured six, the same number of papillae having 

 been seen by myself. At present, no one appears to have seen 

 the male Oxyuris obesa, which is not surprising considering the 

 rarity of the males of several allied species. Schneider remarks 

 upon the variable size of the female, his smallest specimen mea- 

 suring only 7 millim. and the longest 30 millim. ; nevertheless 

 all the worms were mature. I may state that the variable length 

 of the female Oxyuris curvula of the horse is even more striking ; 

 for, whilst Schneider fixes the extreme length at less than 2 inches 

 (45 millim.), I, on the other hand, have frequently obtained speci- 

 mens between 3 and 4 inches, and in one example nearly 5 inches 

 in length (118 millim.). 



The literature of 0. obesa is meagre. 



Diesing. — Syst. Helm. 1851, vol. ii. p. 141. Denkschr. d. kais. Akad. 

 Wien, xiii. 1857, S. 12. Eevis. [op. cit.) S. 141. 



Schneider. — Monogr. d. Nem. 1866, S. 121 (figs.). 



CoBBOLD.— Proceed. Zool. Soc. March 1876, p. 297 (figs.). 



O. v. LiNSTOW. — Compend. 1878, S. 26. 



3. ASCARIS SIMPLEX, Rucl. 

 A. delphini, Rud. 



In Mr. Darwin's list some parasites referable to this species 

 are marked " Worms from stomach of a Porpoise off" the 1. of 



