154 



THE FUR SEALS OF THE PRIBILOF ISLANDS. 



Baird (1853, p. 18) cites A. oscuUta in the collectiou of the British Museum, the 

 specimens coming from the stomach of Phoca vitulina (collectiou of Siebold) and of 

 P. barhata {=Erignathus barbatm), collected by Leach at Baflns Bay. 



Schneider (1866, p. 44) appears to be the first to clearly define this worm and to 

 figure it (see figs. 76 and 77) ; his diagnosis reads : 



C. Lippen ohne Zahnleiste mit Aurikelu und Zwisohenlippen. . 



14. ASCARIS OSOULATA. K. 



5 SO"! 



i 40" 



Eckzahn klein und stumpf, hinterer Eand dor Aurikeln beginnt mit eiuem convexen Bogen. 

 Kinne tief. An der Basis der Lippen und Zwischenlippen unter der Haut lauft rings herum ein car- 



Vil. 



Fig. 79. 



Kg. 81. 



Fig. 82. 



minrotlier Pigmentstreif. Schwanz des ^ 8 Papillen iinter dem After, 1 und 2 mit kegelformiger 

 Pnlpa, 7 und 8 bilden eine Doppelpapille, dann folgen vor dem After 20 und mehr Papillen unregel- 

 miissig zu 2, 3, uud 4, und zuletzt eine Eeihe Papillen. Im Ganzen 70 geziihlt. 

 Phoca groenlanclica. Darm. 



Bastain (1866) in his extensive discussion of the anatomy of nematodes refers a 

 number of times to a worm determined as A. osoulata. One of his figures of the 

 anterior extremity shows three lips, but no intermediate lips; he states that the 

 intestinal caecum is present, but the oesophageal caecum absent. It is not at all 

 improbable that Bastain had some other form, possibly A. decipiens, as suggested by 

 von Liustow, rather than A. osculata. 



Krabbe (1878, p. 45) mentions the worm from various hosts. It was found ten 

 times in Phoca groenlandiea, in Greenland, by Vahl, M0rch, Olrik, and Pfaff; in 



