DESCRIPTION OF FIGURES. 175 



Fi". 20. A young Ascaris found in the stomach of tbo Alaskan fur seal, auil coi're8i)on(ling' to "A. cap- 

 SKhirin." Zeiss 4/a* 10, stage, afterwards reduced one- third. Original. 



Fii^. 21. Anterior extremity of same. Zeiss 4/8, stage, afterwards reduced one-third. Original. 



Fin-. 22. Posterior extremity of same. Zeiss 4/8, stage, afterwards reduced one-third. Original. 



Fig. 2.3. Dorsal lip of Ascaris simjjiex, showing basal portion with bilobed anterior projection and 

 dentigcrous ridge. After Krabbe, 1878, pi. i, fig. 4. 



Fig. 24. Ventral view of tail of male .specimen of Ascaris aimjilcr, showing cloaca and sense papillae. 

 The postanal papillae are divided into two groups; four pairs of conical iiapillae near the 

 tip; one and a half pairs of sessile papillae near the cloaca; the praeanal papillae near 

 the cloaca are less prominent than those situated further cephalad. x 100. After Krabbe, 

 1878, p. 48, fig. 2. 



Fig. 25. Ascaris simplex from Otariajuhata. Natural size. After von Linstow, 1888, pi. I, tig. 1. 



Fig. 26. Dorsal view of dorsal lip of Ascaris simplex from Otaria jubata. After von Linstow, 1888, 

 pi. I, fig. 2. 



Fig. 27. Apex view of lips of Ascaris simplex fiom. Otariajuhata : a., upper lip ; 6., mouth ; c, ventral lip. 

 After von Linstow, 1888, pi. i, fig. 3. 



Fig. 28. Egg of Ascaris simplex from Otariajuhata. After von Linstow, 1888, pi. i, fig. 4. 



Fig. 29. Proximal end of intestinal tract of Ascaris simplex from Balaenoptera sihbaldii, showing two 

 divisions of the oesophagus and proximal end of the intestine. Zeiss 2/A*2. After 

 Jagerskiold, 1894, pi. xxviii, fig. 42. 



Fig. 30. One of Diesing's original figures of "Conocephalus typicus" {= Ascaris typica). The drawing 

 shows a partially dissected female, with the umbrella-like structure on the head which 

 was mistaken for a generic character; the intestine and one of the longitudinal lines are 

 visible in the body cavity; the vulva is distal to the middle of the body; an error has 

 undoubtedly been made in the original drawing in the structure of the genital tract, since 

 the vagina and body of the uterus should be comparatively short. After Diesing, 1860, 

 fig. 10. 



Fig. 31. Dorsal lip of "Ascaris conocephalus " (= Ascaris typica), showing the structures described in the 

 text. X 100. After Krabbe, 1878, pi. i, fig. 5. 



Fig. 32. Ventral view of tail of male specimen of "Ascaris conocephalus" {=^ Ascaris typica), showing 

 the caudal jiapillae as described by Krabbe. x 100. After Krabbe, 1878, p. 50, fig. 3. 



Fig. 33. Ventral view of dorsal lip of " Peritracheliits typicus'' (^Ascaris typica), showing the structure 

 described in the text, x 125. After Drasche, 1883, pi. iii, fig. 6. 



Fig. 34. Dorsal view of dorsal lip of "Feritrachelius typicus" {^^^^ Ascaris typica), showing the structures 

 described in the text, x 125. After Drasche, 1883, pi. iii, fig. 7. 



Fig. 35. Inner surface of ventro-lateral lip of "Feritrachelius typicus" {= Ascaris typica), nhowing the 

 structure described in the text, x 280. After Drasche, 1883, pi. iii, fig. 1. 



Fig. 36. Inner surface of right ventro-lateral lip of "Feritrachelius typicus" {=^Ascaris typica), showing 

 the structure described in the text, x 280. After Drasche, 1883, pi. in, fig. 2. 



Fig. 37. Apex view of lips and mouth of "Feritrachelius typicus" (^^Ascaris typica), showing the rela- 

 tive position of the lips and the absence of intermediate lips, x 125. After Drasche, 1883, 

 pi. Ill, fig. 5. 



Fig. 38. Ventral view of tail of male specimen of "Feritrachelius typicus" {—Ascaris typica), showing 

 the cloaca and caudal papillae as seen by Drasche. x 60. After Drasche, 1883, pi. iii, fig. 9. 



Fig. 39. Male specimen of Ascaris typica from Leidy's collection (U.S.N.M., No. 5015) determined by 

 Leidy as "Ascaris simplex." Natural size. Original. 



Fig. 40. Female specimen of Ascaris typica from U.S.N.M., No. 5015. Natural size. Original. 



Fig. 41. Dorsal view of anterior portion of Ascaris typica from U.S.N.M., No. 5015, showing dorsal lip, 

 ventro-lateral lips, and cervical papillae. Zeiss 4/16, stage. Original. 



Fig. 42. Ventral view of anterior portion of Ascaris typica from U.S.N.M., No. 5015, showing ventral 

 lips and cervical j)apilae. Zeiss 4/16, stage. Original. 



Fig. 43. Apex view of isolated cuticle of lips of Ascaris typica from U.S.N.M., No. 5015, showing gen- 

 eral form of lips and the dentigerous ridge. The cuticle of the dorsal lip is somewhat 

 misplaced. Zeiss 4/4, stage, afterwards reduced one-half. Original. 



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