138 



THE FUR SEALS OF THE PRIBILOF ISLA.NDS. 



The adult females (fig. 40) vary in leugth froTii 37 to 44'"'", in breadth from 1.5 to 

 2""^', and are attenuated slightly toward each extremity. The vulva, aecording to 

 Diesing, lies distal of the middle of the body; according to Drasche, about in the 

 middle. In one of our specimens, 44""" long, the vulva was found 20""" from the head. 

 The vagina measured G'"'" long, the body of the uterus 8""", the horns 8""". The eggs 

 (fig. 48) are globular, 40 /< to 56 //, and undergo segmentation in the uterus. The anus 

 is about 0.2G'"'" from the tip of the conical tail. 



Nomciiclature. — The specific term /y/^icahas priority, while Diesing's (1850) name 

 Feritravheliiis can not be applied to this form, either as generic or subgeneric name, 

 even should, as Drasche thinks, A. typica be genericaily (or subgeiierically) related to 

 PeritracheHtm insiffnLs, since A. typica belongs in Dujardin's (1845) subgenus AnisaMs, 

 of which we make it the type, 



YoKiifi HjicchiH'iis of Ascaris typica. — Besides the adults described above, U.S.N.M. 

 No. 5015 contains numerous specitneus (figs. 49-52) of young ascarides corresponding 



Fig. 50. 



Fig. 5K 



to the young forms of A. decipiens described on page IIG, They measure 15 to 22""" 

 in length by 0,25 to 0,.'54'"'" in bieadth, and present the characters usually given for 

 "A. capsular la?'' The ventral tooth is slightly more prominent than in the young of 

 A. (lecipiens. Specimens may be found with the larval cuticle, or with this cuticle 

 partially discarded. 



We do not hesitate to look upon these as tlie young of A. typica and to assume that 

 the host ])ecoines infected by eating lish. 



4. ASCARIS BICOLOR Baird, 1868 [nee Rudolphi, 17931. Sp. inq. 



(Fi<,'s. 53-.57.) 

 ? 1809, Aacarin simpler, Rudolphi, se(i piigf^s 120-12(). 



1808, Ancarig hicolor IJ.viui) [iico KuDOi.i'iii, 179:5], Proc. Zool. Soc. London, p. 71. figs. A-C— Miirie, 



1868, I'roc. Zool. Soc. Loudon, jiages 67-71. — VoN Linstow, 1878, Compendium der Helniin- 



tliologie, p. 42.— Stos.sich, 1896, Boll. Soc. adriatica Sci. nat. Trie.ste, Wll, p. 67. 



Diagnosis. — Tntermeiliato lips absent; lateral cervical alao absent; lips distinct, prominent, 



rounded, of moderate si/.is more disdnct and l;irger than in A. simpler, and provided with a dcnfiger- 



oiis ridjic. Body cyliiidric^al, attenuated anteriorly (but less so Ibau ./. •vi/»/)/e,(), of a brownish color, 



except at the anterior extremity which iswliite; the posterior extremity is sometimes red. Cutiele 



