ASCARIS LOBULATA. 



161 



Stossich (1896, p. 43) takes bis diagnosis from the other authors and evidently did 

 not examine specimens. 



III. Data concerning the intermediate lips are wanting, 

 a. Spicules unequal. 



11. ASCARIS DUSSUMIBRII Beiieden, 1870. Sp. inq. 



1845, "Ascaris simplex Rudglpmi, 1809" misdetermined, Du,Jardin, 1845, Hist. Nat. Helminthes, pp. 



220-221. 

 ?1860, Conocephalus typiciis Diesing, see p. 127. 

 1870, Aacaris Diissiimierii Beneden, Bull. Acad. E. Belgique, 2 ser., XXIX, No. 4, p. 362-363. Dujardin's 



specimens renamed. 



Diagnosis. — Intermediate lips?; lateral cervical alae absent; head obtuse, 0.4""" broad; lips 

 small, body whitish, quite thick, slightly more attenuated toward the head than toward the tail. 

 Cuticle with cuticular bands 20 to 30 jn broad, giving the margin of the worm a serrate appearance. 

 First portion of the oesophagus 5 to S.S"!"' long, 0.5™™ broad; followed by a second portion, which is 

 sigmoid, 1.5'"™ long 0.4™" broad; intestinal and oesophageal caeca ? 



Male: 79™™ long by 2.2™"' in diameter; tail curled, with lateral alae and 8 to 10 (pairs?) papillae; 

 spicules unequal, one 27™™ (2.7™™?) the other 15™™ (1.5'"™?) long. 



Female: 70 to 100™"" long by 2 to 2.5™™ in diameter; tail very short; vulva in anterior half of body 

 25 to 40""" from anterior end. Eggs globular, smooth, 41 to 43 yU. Anus 0.2™™ from tip of tail. 



Habitat: Intestine of marine mammals. 



Host. 



Locality. 



Collector. 



Authority. 





W^est of Maldiv© Islands -.- 



Diissuinier . ... 



Dujardin, 184,'), p. 221. 









Summary. — Dujardin (1845) determined some worms, collected by Dussumier, as 

 Ascaris simplex; as the form diHers essentially from A. simplex of other authors van 

 Beneden (1870) proposed to make it a distinct species, A. Dussumierii; von Linstow 

 (1888) thinks the worm may belong to some other genus than Ascaris ; Stossich (1896) 

 considers it identical with A. simplex. The question can not be definitely decided 

 without a reexamination of the type specimens, but judging from the description we 

 are suspicious that Dujardin's form is identical with Ascaris typica. In detail the 

 history of the species is as follows: 



Historical review. — Dujardin (1845, pp. 220, 221) proposed the subgenus 

 Anisakis in the genus Ascaris for forms in which the spicules are unequal. He cites 

 as members of this subgenus A. distans Rudolphl, which he had evidently not 

 examined, and the supposed "A. simplex Eudolphi" {=A. Dussumierii) which he had 

 studied. We designate this latter form as type of the proposed subgenus. Dujardin's 

 diagnosis reads as follows : 



ANISAEIS. 

 Ill* Sous-genre. 



Male ayant deux spicules iu^gaux. 



77 Ascaride des Dauphins. Ascaris simplex— RvDOispm. Eutoz., II, 1, p. 170, et Synops, p. 60 [49], 

 No. 53. 

 Corps blanchatre, assez dpais, treute-sis a quarante fois aussi long que large, un pen plus aminci 

 en avant ; tete obtuse, large de 0™™, 4 a trois lobes tres-petits ; sans aucune trace d'ailes on membranes 

 lat^rales; oesophage long de 5 &, 5""™, 5, un pen renfle en massue et large de 0"™, 5, suivi d'un 

 ventricule mince flexueux, long de 1™'", 5, large de 0™'", 4; intestin opais, large de 1™™; queue tres- 

 courte, obtuse; tegument a stries transverses, tres-prononcdes, distantes de 0™™, 02 a 0'"™, 03, et comme 

 dent6 en scie lateralement. 



5947— PT 3 11 



