336 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



insufficient description and the later composite one. Diesing (1861) 

 in his latest discussion of this species limits the hosts to the two given 

 above, as does also Linstow (1879). Secondary: Unknown; prob- 

 ably similar in a general way to that of T. fissis-pina (p. 343). 



Location. — Glandular stomach or proventriculus. 



Morphology. — Tetrameres (p. 334). 



Male 5 to 6 lines long by 1/2 line wide (this would apparently be 

 about 12 to 15 mm. long by 732 to 999/x, wide; see discussion under 

 size of female) ; according to Linstow (1879) 11 to 13.5 mm. long 

 by 750/* wide. Body subcylindrical, threadlike, curved to crescent 

 shape, white, pointed at both ends. Drasche's figure of the posterior 

 extremity (fig. 400 b) shows spines along the lateral lines. Cuticle 

 transversely striated. Combined length of pharynx and esophagus 

 3/4 line (evidently about 1.9 to 2.2 mm. long). The testis extends 



C. 



Fig. 399. — Tetrameres paradoxa. a, Female, natural size; i, lateral 

 view, and c, view from above, of same, enlarged ; d, egg. enlarged. 

 After Diesing, 1835 



anteriorly to the posterior extremity of the esophagus. The intestine, 

 as well as the vas deferens, shows in its posterior portion a pyriform 

 swelling. Cloacal aperture 1/16 line (apparently about 156 to 187jn) 

 from posterior extremity. A sudden decrease in dorso-ventral diam- 

 eter produces a depression immediately posterior to the cloacal aper- 

 ture. Two spicules of very different lengths; the right one short 

 (480ju) , the left one 3 mm. or more. In Drasche's figure there is at 

 least one pair of ventral postanal spines or very small papillae. 



Female the size of a pea or larger; 3 lines long by 2 lines wide. 

 (Diesing gives these measurements; he also gives a figure of the 

 female (fig. 399 a), " one of the small specimens," natural size, which 

 measures 8 mm. long by 7 mm. wide ; the measurements in millimeters 

 are therefore at least 2% to 3 times those given by him in lines.) 

 Linstow (1879) gives size of female as 6.75 mm. long by 4.5 mm. 

 wide. Body blood-red, subglobular, with 4 deep, equidistant, longi- 



