132 



THE FUR SEALS OF THE PRIBILOF ISLANDS. 



Ocean." The collection was made by Dr. William H. Jones, U. S. N. Leidy does not 

 describe the specimens, but in his collection we find a bottle (GoU. Leidy, No. 23= 

 U.S.N.M., No. 5015) containing numerous specimens of Ascaris, with the label '^Ascaris 

 simplex. Belphinus. Dr. W. H. Jones." As these are the only specimens we find in 

 Leidy's collection bearing a label which in any way corresponds to the data given in 

 Leidy's article, they are probably the worms which Leidy had before him at the time 

 he quoted "Ascaris simplex^' from the Pacific Ocean. These specimens, as will be 

 shown below, agree in essential characters with the description of Diesing's Conoeeph- 

 alus typicus as given by Krabbe and Drasche. ^ 



Jforsal- 



Fig. 44. 



Von Linstow (1889, p. 26) cites "Ascaris conocepJiala" with " Oonocephalus typicus''^ 

 and "Peritrachelius typicus^ as synonyms. 



Jagerskiold (1894, p. 453) does not state that he has examined this species; his 

 remarks are of historical and nomenclatural nature, and he accepts the name 

 "Ascaris {PeritraoJielius) typicus." 



Stossich (1896, pp. 17, 18) has evidently overlooked Drasche's article on this 

 worm, but gives a diagnosis by which, however, it would scarcely be possible to 

 recognize the parasite. He has evidently not examined specimens, but bases his 

 statements upon Diesing (1860) and Krabbe (1878). He includes Leidy's specimens 

 under J., simplex. 



