130 



THE FUR SEALS OF THE PRIBILOF ISLANDS. 



Kiabbe proposed the name "AstrtWs conocephalus n. sp." for this parasite, which 

 was collected by llygoin nine times, by Iverson ouce, aud by Andrea twice, from the 

 stomach of dolphins of the Atlantic between America and Africa, ranging from 4° 

 south latitude to IH)-^ north latitude, and from 23° to 07'^ west longitude. Reinhardt 

 determined the toothed whales in which Andrea found the worm as belonging to the 

 genus Clymenia (-= Prodelphinus) ; but regarding the other hosts he was unable to 

 state anything definite. 



In one lot of 370 specimens the proportion of males to females was 1:1. The 

 males attained 70""" in length, the females !►()"'"'. The worms are somewhat similar to , 

 ".1. .simplex,^' but differ in essential details of the lips and caudal papillae. The lobes 

 of the lips are provided with a dentigerous ridge, are narrower, and more distinctly 

 separated from the rest of the lip (see lig. 31) than is the case in .1. simplex. Nine or 

 ten pairs of postanal papillae are found on the tail of the male (tig. 32). Of these 



Fii;. ;i9 



Fig. :!«. 



Fig. 40. 



generally three pairs, occasionally two pairs, arc coni(;al and near the tip. The other 

 seven pairs are shorter and situated near the cloaca. The numerous praeanal papillae 

 are conical and arranged on each side in three rows, well separated from one another, 

 those situated nearer the cloaca being shorter and more irregularly arranged. 



Drasche (1883, pp. 109-111), evidently overlooking Krabbe's paper, reexamined 

 Diesing's original specimens. He found one male with the umbrella-like structure 

 on the head, as described and ilgured by Diesing, one worm without the head, and 

 two which plaiuly showed three lips. Upon closer examination he found that the 

 umbrella-like structure on the head was simply a i)ortion of the mucosa of the host. 

 Upon the removal of this mucosa the three lips were plainly visible. These lips 

 (tigs. 33-37) Drasche (p. 110) describes as follows: 



Die Lippen zeilallon in eine Kiickeu -mid /wci Bauclilippoa. Niclit alleiii jedocb (lass die eretoro 

 von den let/.tcreu sclir vorscliied.Mi ist, ja s.dhst die Baucblippcn siiid nicht ganz symmetriscb zn 

 ncnnen. Die Dorsallippo (Taf. Ill, Fig. (i iind 7) bcsit/t eine scbriig iiacb ansseii genoigte Basis und 

 zerflillt in zwei balbkreisloimige Seitenlappeu imd oineu zweigetbeilteu Mittollappcu. In lotztercu 



