ASCAEIS LOBULATA. 



161 



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

 not examine specimens. 



III. Data concerning the intermediate lips are wanting, 

 a. Spicules unequal. 



11. ASCARIS DUSSUMIERII Beneden, 1870. Sp. inq. 



1845, "Ascai-is simplex Eudolphi, 1809" misdetermined, Ddjardin, 1845, Hist. Nat. Helminthes, pp. 



220-221. 

 ? 1860, Conooeplialus typicag Diesing, see p. 127. 

 1870, Atcaria Dmsumimi 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 yU broad, giving the margin of the worm a serrate appearance. 

 First portion of the oesophagus 5 to 5.5"""' 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""" (l.S"'"?) 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/<. Anus 0.2""" from tip of tail. 



Habitat: Intestine of marine mammals. 



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

 Ascaris simplex; as the form diiiiers 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 

 AnisaMs in the geuus Ascaris for forms in which the spicules are unequal. He cites 

 as members of this subgenus A. distans Eudolphi, 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" Sons-genre. 



Male ayant deux spicules indgaux. ^ 



77 Ascaride des DaupMns. Ascaris simplea;— Eudolphi. Entpz., II, 1, p. 170, et Synops, p. 60 [49], 

 No. 53. 

 Corps blanch^tre, assez ^pais, trente-six ^ quarante fois aussl long que large, nn pen plus aminci 

 en avant; tSte obtuse, large de O""", 4 k trois lobes trfes-petits; sans aucune trace d'ailesou membranes 

 lat^rales; oesophage long de 5 S, 5""°, 5, un pen renfliS en massne et large de 0""", 5, suivi d'un 

 ventricule mince flexueux, long de 1""", 5, large de 0""", 4; intestin cSpais, large de l"™; queue trfes- 

 courte, obtuse; tegument h stries transverses, trfe8-prononc(5es, distantes de O™™, 02 k 0'""", 03, et comme 

 dent€ en scie lat6ralement. 

 5947— PT 3 11 



