ASCARIS SIMPLEX. 



121 



1851, Asonris angiiliralvis Creplin, Arch. f. Natnrg., 17 .Ihg., I, pp. 158-ltiO. — Diesinc;, 1860, Sitziingsber, 

 k. Akad. Wiss. Wien, XLII, No. 28, pp. 656-657. 



1878, Jscaris simplex Rudolphi, of Krabbe, Oversigt k. Danske Videnskab. Selskab Forband., 1878, 1. 

 pp. 47-49, fig. 2, pi. I, fig. 4, rosnmo, p. 12. — VON Linstow, 1888, Report H. M. S. Challenf/vr, 

 Zool., XXIII, part lxxi, pp. 2-3, pi. i, figs. 1-4. — Bkaun (1891), Arch. d. Fr. d. Naturg. i. M., p. 

 110. — J.\GEESKi(')LD (1891), Biol. Fciren. FJhbandl., Stockholm, III, No. 7, p. 132. — .Jageks- 

 KioLD, 1894, Zool. Jahrb., VII, pp. 474-476, pi. xxviii, fig. 42.— Stossigh, 1896, Boll. Soc. adri- 

 atica Sci. nat., XVII, p. 17. 



? 1889, Ascaris Eiikenthal'd Cobb, see j). 144. 



Diagnosis. — Intermediate lips absent; lateral cervical alae absent; lips of nearly equal size 

 (Krabbe), or (von Linstow) dorsal lip (0.12'"'") smaller than ventro-lateral lips (0.30'"™) ; lips with two 

 anterior lobes, constricted from the base, and armed on their inner surface with a dentigerous ridge; 

 cervical papillae. Bodj' attenuated more toward the anterior than toward the posterior end. Cutic- 

 ular bauds 23 /( broad, with finer striae about one-eighth as broad ; lateral lines 0.23 /( broad, dorsal 

 and ventral lines 35 /». Oesophagus composed of two portions; anterior jiorti on increases gradually 

 in diameter; posterior portion begins with a swelling and then decreases; caeca absent. 



Male: 37 to ISOi"'" long by 0.9 to 2.5'"'" in diameter; tall with lateral alae about 2.5™'" long; 6 to 

 8 pairs of postanal papillae; of these, 4pairs are near the tip, the outer pair being the longest; the 

 other 2 or 3 pairs are shorter and nearer the anus; 50 or more (pairs?) praeanal papillae; of these, 6 

 pairs of shortly pedunculate paiiillae lie antero-Iateral of the cloaca; then follows cephalad on each 

 side one row of long papillae, or two rows which are closely approximate; spicules long (1.68™""), with 

 saber-like curvature (Linstow). 



Female: 79 to 200""" long by 2.2 to 2.75'"'" thick; vulva three-sevenths the length from the ante- 

 rior end (Linstow), about one-half (36 : 72 and 70 : 150) the length from the anterior end (Jiigerskiold). 

 Eggs spherical, 52 /t with roundish elevations. 

 Habitat : Stomach of marine mammals. 



Host. 



Locality. 



Collector. 



Authority. 



halaenoptera rostrata.. 

 Balaenoptera rostrata . 

 Balaenoptera rostrata.. 

 Salaennptera sibhaldii. 

 Delphinapterus leucas . 

 Delphinapterus leucas . 



Delphinus sp 



Eyperoodon rostratus 



Lagenorhynchus albirostris . 



Monodon monoceros 



Monodon monoceros 



Otaria jubata 



Phoccena phoccena^ 



Phoccena phoccena'' 



Plantanista gangetica'^- 

 Porpoise, gen.? sp.?^... 



Koren . 

 Koren . 



Specimens from Sparre 



Greenland 



SepecimensfromLev- 



iiisen of Copenhagen. 



Patagonia 



Faroe 



Denmark 



Greenland 



Specimens from Steen- 



strup. 

 Kerguelen Tsland.s 



Schneider of Troniso . 

 Olrik, Pfaff, Andersen 



Chiloe Island . 



Chlerchia 



Suenson 



Ibsen, Eeinhart. 

 Olrik, Pfatf 



Challenger expedition 



Albers 



Anderson 



Darwin, :835. 



Creplin, 1857, pp. 158-160.1 

 Krabbe, 1378, p. 12. 

 Jagerskiold, 1894, p. 475. 

 Jagerskiold, 1894, p. 475. 

 Krabbe, 1878. p. 48. 

 Jagerskiold, 1894, p. 475. 



Monticelli, 1889, p. 69. 

 Krabbe, 1878, p. 48. 

 Krabbe, 1878, p. 48. 

 Krabbe, 1878, p. 48. 

 Diesing, 1860, p. 657. 



Linstow, 1888, p. 2. 

 Krabbe, 1878, p. 48. 

 Kudolphi, 1809, p. 170. 

 Cobbold, 1876, p. 297. 

 Cobbold, 188B, p. 176. 



' Becorded as Ascaris anguUvalvis. 



'In need of verification, see p. 124. 



Summary. — Our first exact statements regarding this species we owe to Krabbe 

 (1878), who determined certain worms from toothed whales as Ascaris simplex Eudolphi, 

 and upon examination of material collected by Koren, a part of which was described by 

 Creplin (1851) as A. anguUvalvis, determined the latter form as identical with the former. 

 We have at present absolutely no exact knowledge of the forms determined as A. simplex 

 prior to the appearance of Krabbe's work, and some of the later determinations are 

 exceedingly doubtful. The exact status of A. delphini, quoted by most authors as a 

 synonym of A. simplex, can not be ascertained (see p. 162), but further investigation 



