ASCAKIS DECIPIENS. 



113 



shows that the worms agree in essential characters with A. decipiens. There are 

 also a few unrecorded female specimens of the same species in the Stiles collection 

 (U.S.N.M., No. 5341), taken from Phoca vituUna, at Leipzig, in July, 1890; the origin 

 of the host is not noted on the label. 



After this manuscript was ready for press we received a sending of parasites 

 from Dr. von Marenzeller, of the Vienna Museum. The labels do not give the history 

 of the specimens, but an examination of the material has resulted in the following 

 determinations: 



B. A. I., No. 2829, contains several young specimens, labeled Ascaris decipiens. 

 No host is given. There are no males present, but we believe the determination to be 

 correct. 



Fig. H. 



One bottle with the label "Asearis oseulata, Phoca barhata," contains both Ascaris 

 decipiens (B. A. I., No. 2841), and A. oseulata (B. A. I., No. 2831). One bottle, with 

 the label "Ascaris oseulata, Phoca groenlandica,^' contains both Ascaris decipiens, 

 (B. A. I., No. 2843) and A. oseulata (B. A. I., No. 2835). 



Specimens from Bering Sea. — Among the parasites collected by Lucas, from 

 the Alaskan fur seal, Phoca largha and Mimetopias stelleri, we find quite a number 

 of ascarides (figs. 7-9) which agree in essential characters with A. decipiens, as 

 diagnosed by Krabbe. The worms represent various stages of development, from 

 larval forms 14'n'>' long by 0.5""" broad, described below, to adults 80™'" long by 2"'" 

 in diameter. 



Adults. — The head of the adult is about 0.46"" broad in an average specimen, 



but varies, of course, with the size and development of the worm. Intermediate lips 



are absent, as shown by transverse sections (fig. 10) and other views (figs. 11-14). 



Transverse sections show that the bases of the lips are of nearly equal size; dorsal and 



5947_PT 3 8 



