NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



49 



vegicus in India, and his description and figures leave no doubt that 

 this is HeteraJcis spumosa. He quotes Schneider's (1866) description 

 of //. spumosa and then states : " I have been unable to obtain any 

 specimens of H. spumosa from Europe. The difference in length 

 makes it reasonable to conclude that this is a different species from 

 that now described." It appeals to the present writer as unsafe to 

 make a new species on a slight difference in size where a described 

 species is knoAvn to exist in the same host and in the same location, as 

 animals of all sorts have a more or less definite range of size but not a 

 fixed size. As a matter of fact, my own measurements for H. spu- 

 mosa vary beyond those given by Lane for his species and those given 

 by Schneider for II. spumosa. 



Genus PARASPIDODERA Travassos, 1914rt. 



Generic diagnosis. — Heterakinae (p. 44) : Mouth with three large 

 conspicuous lips. Esophageal bulb present, 

 bursa. Spicules equal or subequal. 

 Gubernaculum present. Vulva anterior 

 to the middle of the body. 



Type-species. — Paraspidodera uncinata 

 Travassos, 1914a. 



Males without caudal 



Fig. 55.— Paraspidodera ttnci- 

 NATA. Lateral view of head. 

 Enlarged. After Travassos, 

 1914. 



PARASPIDODERA UNCINATA Travassos, 1914a. 



Synonyms. — Ascaris uncinata Ru- 

 dolphi, 1819, of Travassos, 1914a; Ilete- 

 rakis uncinata Schneider, 1866, of Tra- 

 vassos, 1914a. 



Specific diagnosis. — Paraspidodera 

 (p. 49) : Mouth with three large equal 

 lips (fig. 55). Esophagus 1.098 to 1.169 

 mm. long. Excretory pore 540 [/. from 

 the anterior end. 



Male 11 mm. long by 300 ^. thick. 

 No caudal bursa. Preanal sucker 

 (figs. 56 and 67) round, about 68 [x wide, and with a chitinous 

 ring bearing a papilliform node on the posterior margin. Seven 

 pairs of preanal, 1 pair adanal, and 13 pairs of postanal papillae. 

 Of the preanal papillae, one pair is somewhat anterior of the sucker, 

 another is adjacent to the anterior margin of the sucker, another at 

 the side of the sucker, another at the posterior border of the sucker, 

 and three pairs nearer the anus. Of the postanal papillae, the two most 

 anterior pairs are near the median line, the third pair is remote from 

 the median line, and the remaining 10 pairs are arranged in two 

 longitudinal lines on each side of the tail, the lines most remote from 

 the median line presenting in profile on viewing the ventral surface 



10600°— Proc.N.M.vol.50— 16 4 



