112 



THE FUR SEALS OF THE PEIBILOP ISLANDS. 



defined by Krabbe; the second portion is shorter than the first, and may be united 

 with the intestine in two different manners ; either the dorsal surface of the oesophagus 

 may be united with the ventral surface of the intestine, thus leaving the distal portion 

 of the second part of the oesophagus and the proximal portion of the intestine as two 

 caeca (fig. 5), or the distal end of the oesophagus may be united with the intestine in 

 such a way that the intestinal caecum is present, the oesophageal caecum on the other 

 hand, absent (fig. 6). The excretory organ is developed in the same peculiar manner 

 as in A. osculata and A. spiouUgera, but discharges between ventral lips, while in 

 A. osculata and A. spiouUgera it discharges distally of the intermediate lip; the gland 

 extends beyond the middle of the body. The vulva is situated about in the middle of 

 the body, or somewhat distal to the middle. " The vagina, which first runs cephalad 

 for about 5""» and then turns, becomes widened into the uterus a few millimeters back 



Fig. 8. 



Ifdrseil. 



Fig. 7. 



Fig. 9. 



Tentral. 



Fig. 10. 



of the turning point; about e™"" back of the foremost point of the vagina, that is, 

 immediately distal of the vulva, the uterus branches into two horns 8™" long." 



Jagerskiold calls attention to the resemblance which A, bullosa Cobb bears to 

 this form; he believes they are identical, but owing to the lack of certain details 

 regarding the lips of Oobb's form, he reserves definite judgment upon the case. 



The observations by Krabbe, Cobb, and Jagerskiold seem to be the only original 

 work upon A. decipiens which has been published, and in this connection it must be 

 recalled that the specific identity of the worms described by Baird and Cobb, with 

 the parasites discussed by Krabbe ^.nd Jagerskiold is probable, but not absolutely 

 established; furthermore, that Eudolphi's (1809) original A. simplex may possibly 

 belong to this species rather than to A. angulivalvis (see p. 124). 



Stiles and Hassall (1894, p. 340) catalogued specimens found in the Leidy collec- 

 tion (No. 259=U.S.N.M., No. 5051), collected by Dr. Chapman fromi Macrorhinus 

 angustirostris, and determined as Ascaris osculata. An examination of this material 



