ASCARIS OSCULATA. 159 



Male: 9 to 10 pairs of postanal papillae (fig. 89), of which 1 to 4 are near the tip; 

 1 pair of double papillae and 3 to 4 pairs of single papillae nearer the cloaca; spicules 

 very long, 6 to 8"""'. 



Female:' Prominent vulvular ridge about on border between first and second 

 anterior thirds of body. 



As the species is quite well studied from a systematic standpoint, we will not give 

 a detailed discussion of the worm found in Bering Sea, but will confine ourselves to 

 the following statements: 



Von Linstow mentions deep cuticular folds immediately back of the lips. These 

 folds, which are very prominent in our specimens, are due to the arrangement of the 

 cuticular bands (fig. 88). For a distance of about 0.13"™ back of the lips the anterior 

 border of each band extends for some distance over the posterior border of the band 

 immediately in front of it, while on the rest of the body the posterior border of each 

 baud extends only very slightly over the anterior border of the band immediately 

 distal to it. The portion of the body to which the lips are attached is thus diffieren- 

 tiated into a peculiar and quite characteristic manner. On the body the cuticular 

 bands are about 8 yu broad, but the finer intermediate striation is lacking. The cervical 

 papillae are found about 0.9""° from the head. 



We find considerable variation in the arrangement of the caudal papillae in the 

 males, but the arrangement of four pairs of papillae near the tip of the tail and a pair 

 of double papillae between these and the cloaca appear quite constant. 



The prominent transverse vulvular ridge figured by Cobbold is quite characteristic. 

 We also find that the eggs (68 to 72 /u) segment to the morula stage in the uterus. 



10. ASCARIS LOBULATA Schneider, 1866. 



(figs. 90-92.) 



? 1819, Aacaris delphini Rudolphi, see page 162. 



1866, Ascaris lobwlata Schneider, Monographie der Nematoden, p. 44, one fig. $ tail.-^KRABBE, 1878, 

 Oversigt K. Danske Videnskab. Selskabs Forhand, 1, p. 47, pi. I, fig. 2. — JageeskiOld, 

 1894, Zool. Jahrbiieh, VII, p. 467, pi. xxviii, fig. 37. — Stossich, 1896, Boll. Soc. adriatica 

 Sci. Nat. Trieste, XVII, p. 43. 



Diagnosis. — Intermediate lips present ; lateral cervical alae f ; lips similar to those of A. osculata, 

 but stronger; the anterior lobes of the pulpa extend into the lateral projections; cuticular striation? 

 Oesophagus composed of two portions ; posterior portion unusually short in proportion to anterior 

 portion; oesophageal and intestinal caeca present. Excretory organ similar to that of A. osculata. 



Male : 40""" long ; tail with 12 pairs of postanal papillae, of which 1 pair is conical and lateral, bat 

 varying in position; 1, 2, 3 in a row near the tip; 4 to 12 irregularly arranged in groups of two and 

 three; praeanal papillae in a single row ; spicules? 



Female: 50""" long; vagina about one-fourth the length of the body from the head; eggs? 



Habitat: Intestinal tract of marine mammals. 



