ASCARIS TYPICA. 



127 



3. ASCARIS TYPICA (Diesing, 1860) Jiigerskiold, 1894. 



(Figs. 30-51.) 



1 1845, "Ascaris simpUx Eudolphi, 1809," of Dujdrdin, see p. 161. 

 1860, Conoeevlialus typieiis Diesing, Sitzungsber. k. Akad. Wias. Wien, XLII, No. 28, p. 669. — Von 



LiNSTOW, Compendium : d. Helminthologie, p. 59. — Cabus, 1863, in Peters, Cams & Ger- 



staeoker, Handbuch der Zoologie, II, p. 462. 

 f 1870, Asoaris Dussumierii Benedbn, see p . 161. 

 1878, Ascaris conoceplialus Krabbe, Oversigt K. Danske Videnskab. Selskabs Forhand., 1, pp. 49-51, 



fig. 3, pi. I, fig. 5, r^sum6 J). 12. 

 1889, "Asearis eonocephala Krabbe," in von Linstow, Compendium : Nachtrag, pp. 25, 26. — Stossich, 



1896, Boll. Soc. adriatica Sci. nat. Trieste, XVII, pp. 17-18. 

 1883, Peritraohelius typicus (Diesing, 1860) voN Draschb, Verhandl. k. k. zool.-bot. Gesellsoh. Wien, 



XXXIII, pp. 109-111, pi. Ill, figs. 1-9. 

 1886, "Ascaris simplex Eudolphi," misdetermined, Leidy, Proc. Acad. Nat. Sci. Pliila., p. 311. 

 1894, Ascaris {Peritrachelius) typious (Diesing, 1860) JXgerskiOld, Zool. Jahrb., VII, p. 453. 



Diagnosis. — Intermediate lips absent; lateral cervical alae abB,ent; lips with very different outjiue 

 and witli dentigerous ridge ; dorsal lip with basal portion 0.16 to 0.2""'" broad by 80 to 88 /t long, which 

 is divided into two large lateral lobes, bearing in its median line a prominent anterior double-lobed 

 projection 48 j.i long by 48 to 64 /t broad; the latter contains on each side a lobe of parenchyma and 

 on its inner surface a dentigerous ridge ; the lateral lobes' bear laterally what appears to be a very 

 delicate dentigerous ridge, but what is evidently a striation; ventro-Iateral lips with large, almost 

 semicircular basal portion 0.16""™ broad, bearing on the inner surface of the anterior portion a par- 

 tially concealed double-lobed projection provided with a dentigerous ridge; they bear laterally also 

 what appears to be a very delicate dentigerous ridge, which resolves itself into a striation ; cervical 

 papillae 0.66""" from anterior extremity. Body attenuate more toward anterior than toward posterior 

 extremity, which ends conically. Cuticle with cuticular bands 32 /i broad, but apparently without 

 finer striae. Oesophagus composed of two portions: anterior portion 4""™ long by about 0.3 to 0.4""" 

 in diameter at distal end; posterior portion 1.25™"' long by 0.25'"™ in diameter, generally sigmoid; 

 oesophageal and intestinal caeca absent. 



Male: 31 to 70"'™ long by 1 to 1.5™'" in diameter; tail compressed dorso-ventrally with dorsal 

 median rounded keel and with lateral alae. It is curved ventrally and bears numerous papillae ; 9 to 

 10 (occasionally 11) pairs of postanal papillae, of which 1, 2, 3 are conical and near the tip ; 4 to 10 

 ( 11) shorter and nearer the cloaca ; 3 and 9, 10, 11 may occasionally be wanting ; more than 75 praeanal 

 papillae each side, arranged in three rows; those nearer the cloaca smaller and more irregularly 

 arranged; cloaca 0.27™'" from tip of tail; spicules unequal, left spicule (3™™) about three times as long 

 as right spicule (0.96™™). 



Female: 37 to 90™™ long by 1.5 to 2™™ in diameter; vulva in middle third (generally near 

 middle) of the body. Eggs globular, 40 to 56 //, segment to morula stage in the uterus. 



Types : Diesing's types in Vienna Museum ; Krabbe's types in Kopenhagen Museum. Typical 

 specimens (Stiles &,Hassall det.) in Coll. Leidy (U.S.N.M. No. 5015); from which specimens will be 

 distributed as follows: U.S.N.M. No. 2813; Coll. B. A. I. (U.S.N.M. No. 2812); Coll. Stiles (U.S.N.M. 

 No. 5456) ; South Kensington Museum, London; Berlin Museum; Coll. E. Blauchard, Paris; Copenhagen 

 Museum; Vienna Museum. 



Habitat : Stomach of marine mammals. 



