13G 



THE FUR SEALS OF THE PRIBILOF ISLANDS. 



These specimens, wbicli we have determined as A. fi/pica, represent various stages 

 of development, from younji- worms 10""" loii^' by 0.27"'"' broad to fully grown worms 

 44'"'" long- by 2""" broad. 



The head of a female specimen examined measures 0.288'"'" broad, and 0.112"'"' 

 long. The base of the dorsal lip measured 0.2'"'" broad by 88 // long, while its anterior 

 projection measured only 04// broad by 48// long (compare figs. 41,4.'?); the deuti- 

 gerous ridge of the dorsal lip located on the inner surface of this dorsal prolongation, 

 as was figured by Krabbe. 



Our observations also agree with those of Krabbe, in that we find the anterior 

 margin (figs. 41, 43) of the median projection indented in the median line, thus 

 forming two lobes, and at this point a prominent tootli is occasionally noticed. The 

 parenchyma fornis an anterior lobulate branch into each side of the projection. The 

 basal portion is divided into two lateral rounded lobes, near the antero lateral margin 

 of which a round papilla is plainly visible. Drasche states that the lateral lobes also 



Fie. 4R. 



bear a dentigerous ridge. This we have not been able to verify, altliough on the margin 

 of tlie lobes we noticed a structure which might be interpreted as a dentigerous ridge, 

 but whicli appeared to us more like a striation. 



The ventro-lateral lips do not, upon first examination, show the distinct division 

 into a prominent anterior narrower and a basal broader portion, such as is described 

 for the dorsal lip; upon careful investigation, however, and especially upon isolation 

 of the cuticle, a bilobed anterior projection may be seen extending into the space 

 between the three lips, similar to but broader than the bilobed anterior portion of the 

 dorsal lip; this projection bears a dentigerous ridge; the base of the lip is about 

 0.16""" broad, and tlie lip is 0.12""" tliick; ordinarily tlie ventro-lateral lips a])])ear 

 nearly semicircular but asymmetrical in outline. We have not been able to clearly 

 define any dentigerous ridge on the !\ase, but we find a number of striae, whicli might 

 easily be mistaken for such a. ridge. The usual papilla is found on the basal portion 

 of each ventro lateral lip. Intermediate lips are absent; cervical alae absent. The 

 cervical papillae ar_ plainly visible 0.0(5"'"' from the anterior extremity. The cuticle of 

 the body is provided with 32 jj transverse cuticular bands, apparently without the finer 



