1876.] DR. T. S. COBBOLD ON ENTOZOA. 297 



cules slightly winged at the extremity ; tail of the female with the 

 terminal spine continuous and scarcely distinct. Males measuring 

 up to |" in length ; females to f " long, with a thickness of - 2 y at the 

 widest part. 



I have given two illustrations representing the tails of either sex 

 (figs. 14 and 15). The profile view shows hut one spiculum, the 

 other being concealed by its side. I could not find the situation of 

 the reproductive opening in the female. The uterine branches were 

 filled with nearly spherical ova, measuring from g-J-g" to jjj-^" from 

 pole to pole. The more advanced in development contained coiled 

 embryos. 



16. ASCAR1S SIMPLEX, Rud. 



Dr. John Anderson's small but interesting collection of parasites 

 also showed four characteristic specimens of this species. They had 

 been obtained by the donor from the intestines of the Dolphin of the 

 Ganges (P/atanista gangetica). Singular to say, all the examples 

 were of the female sex, the two largest measuring about IJ-" from 

 head to tail. The smaller worms did not either of them exceed one 

 inch in length. In connexion with these specimens, all of which 

 were carefully examined by me on the 28th of last September, I have 

 only to add that they presented the peculiarly flexed state of the 

 chylous intestine or stomach as described by Dujardin. As that 

 distinguished helminthologist had already accurately surmised, the 

 Asca?-is delphini of Rudolphi must clearly be regarded as identical 

 with this species. 



1/. ASCARIS LEPTURA, Rlld. 



In addition to the above-described species, Dr. Auderson's collec- 

 tion also shows three specimens of a small nematode taken from the 

 intestine and cloaca of a tortoise (Testudo elongata). Two of them 

 are of the male sex, measuring a trifle over half an inch, the female 

 being nearly three quarters of an inch long. 



18. Oxyuris obesa, Diesing. (Plate XXI.) 



In the collection of entozoa which I received from Mr. Charles 

 Darwin, F.R.S., in the month of August, 1862, there were five 

 specimens of this nematode. Unfortunately Mr. Darwin's MS. 

 has been mislaid. I have little doubt, however, that these parasites 

 were obtained from the intestinal canal of a Capybara in the year 

 1832. All the worms were females, their heads displaying six very 

 conspicuous papillae, three of which I have represented in profile in 

 the accompanying Plate (fig. 16). The point of the tail varied so 

 considerably in form that 1 have added representations of it from two 

 specimens. The extremity was in all cases marked by the presence of 

 asmall conical transparent process, thecentreof which showed a distinct 

 cavity containing fine granules (figs. 17 and 18). The eggs have a 

 long, oval, almost elliptical form, some of them exhibiting a finely 

 sculptured external envelope. Three membranes were distinctly 

 visible (fig. 19). Some of them showed a distinct separation of the 



