174 THE FUR SEALS OF THE PRIBILOF ISLANDS. 



Stiles, Ch. Wardeli, and Hassali,, Alheut — Continued. 



18fl9. Internal parasites of the Fur Seal. The present jiaper, pp. 99-177, 98 figs, in text. 

 Stossich, M. 



1896. II genere Ascaris Liuno <^Boll. Soc. adriatica Sci., uat. Trieste, XVII, pp. 9-120. 

 Zeder, .1. G. H. 



1803. Anleitung ziir Natnrgeschichte der Eingeweidewiiruier. Haniberg. 432 pp., 8^, 4 pis. 



DESCRIPTION OF FIGURES. 



Fig. 1. Dorsal lip o{ Ascaris decipiens, showing the basal portion, the anterior hilobed projection and 

 the dentigerons ridge, x 100. After Krabbe, 1878, pi. i, fig. 3. 



Fig. 2. Tail of male specimen oi Ascaris decipiens, ventral view, showing the cloaca, the six pairs of 

 postanal papillae, and some of the ]>raeanal papillae, x 100. After Krabbe, 1878^ p. 46, 

 tig. 1. 



Fig. 3. Dissection of a male specimen oi\lscaris hiilhosa (=.l. decipiens) from Erignathns harbatus : "b., 

 bulb of the oesopiiagus; d., intestine; de., dnctus cjacnlatorins; eo., excretory organ; A., 

 testicles; inb., bursal muscle; »/., lateral line; sL, vas deferens; ss., vesicula seniinalis 

 ("Samenschlancli"). x 2. After Cobb, 1888, pi. v, fig. 29. 



Fig. 4. Ventral view of tail of Ascaris bulbosa (^A. decipiens) from Krujnathiis harbatus, showing the 

 cloaca and the caudal pajjillae. x 80. It will bo noticed that postanal papillae .5 -)- 6 are 

 double; otherwi.se this figure agrees essentially with Krabbe's figure given above (tig. 2). 

 After Cobb, 1888, pi. v, fig. 30. 



Figs. 5 and 6. Two variations of the anterior portion of the intestinal tract of Ascaris decipiens IVom 

 Halichoerus grypus. Cf. figs. 16 and 17. Fig. 5 shows the two portions of the oesoi)hagus, 

 the oesoi)hageal caecum, the 2)roxlnial portion of the intestine and the intestinal caecum. 

 Fig. () shows the two portions of the oesoi)hagu8 without formation of an oesophageal 

 caecum, and the proximal portion of the intestine with intestinal caecum. Zeiss 2/A2. 

 After Jiigerskii'lld, 1894, pi. xxviii, figs. 40 and 41. 



Figs. 7 and 8. Two female sitcciuiens of Ascari'< decipiens from the Alaskan fur seal and tlie hair seal. 

 The transverse ridge on the ventral surface designates the position of tlie vulva. Natural 

 size. Original. 



Fig. 9. Male s|)ecimcn of Ascaris decipiens from the Alaskan fur seal, showing the curved. Hatted tail. 

 Natural size. Original. 



Fig. 10. Transverse section of the liead of Ascaris decipiens from the Alaskan fur seal, showing three 

 lips with their .seiise-i)ai)illae; the triangular lumen of the oe8o])hagus, with apex extend- 

 ing between the ventral lijjs. The section is slightly diagonal. Zeiss 1/8, stage. 

 Original. 



Fig. 1 1. .Vpex view of theciiticlo of the lips of Ascaris decipiens from the Alaskan fur seal. The excre- 

 tory pore is seen between the ventral lips. Zeiss 4/8, stage. Original. 



Fig. 12. Dorsal view of the anterior portion of Ascaris decipiens from the Alaskan fur seal, showing the 

 <lorsal and ventral lips aud the cervical papillae. Zeiss 4/16, stage. Original. 



Fig. 13. Ventral view of the anterior portion oi Ascaris decipiens from the Alaskan fur seal, sliowiTig 

 the ventral lips and cervical papillae. Zeiss 4/16, stage. Original. 



Fig. 14. Apex vi(!W of tlie lips of Ascaris decipiens from the Alaskan fur seal, showing the anterior 

 double-lobed pl■ojl^ctions; the excretory pore is seen between the ventral lii)8. Free- 

 hand drawing under a magnifying glass. Original. 



Fig. 15. Transverse section througli anterior extremity of the lips of Ascaris decipiens from the Alaskan 

 fur seal, showing the double-lobefl projections with dentigerons ridge. Zeiss 1/1, stage, 

 afterwards reduced one-half. Original. 



Figs. 16, 17. Two views of the proximal portion of the intestinal tract of Ascaris decipiens from the 

 Alaskan fur seal. Cf. figs 5 and 6. Zeiss 4/a'lO, stage, afterwards reduced one-half. 



Fig. 18. Lateral view of tail of male of Ascaris decipiens from the Alaskan fur seal, showing carinated 

 dorsal ridge, lateral alae, concave ventral surface, sense papillae, and spicules. Zei.ss 

 4/16, stage. Original. 



Fig. 19. Ventral view of tail of male of Ascaris decipiens from the Alaskan fur seal, showing some- 

 what the swollen lateral alae, the cloaca, and sense papillae. Original. 



