52 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.50. 



ANALYTICAL KEY TO GENEKA OF SUBULURINAE. . 



1. Male with no spicules or accessory piece visible Heteroxynema, p. 56. 



Male usually with 2 spicules; occasionally with 1 2. 



2. Buccal cavity with very thick chitinous lining in anterior portion and 



with 3 small teeth, with a rounded free edge, limiting the esophageal 



apertui-e AUodapa, p. 60. 



Buccal cavity with a very thin lining and with 3 large teeth, with a 

 sharp free edge,»at its base Subulura, p. 52. 



Genus SUBULURA Molin, 18606. 



Synonyms. — Ileterakls Diijardin, 1845, of authors; Oxynema von 

 Linstow, 1899, of Kailliet and Henry, 1914, in part. 



Generic diagnosis. — Subulurinae (p. 51) : Mouth rarely with three 

 lips, sometimes round, usually oval or hexagonal with the long axis 

 dorso-ventral. Mouth followed by a vestibule with a very thin 

 chitinous lining at the base of which are three large teeth, each with 

 a sharp free edge, marking the beginning of the esophagus. Esopha- 

 gus club-shaped, with a distinct terminal esophageal bulb. Six 

 cephalic papillae usually quite distinct. Two lateral membranes 

 often present. Males with caudal alae slightly developed or lacking. 

 Spicules equal and provided with an accessory piece. Preanal sucker 

 fusiform and without a chitinous ring. Female with the vulva near 

 the middle of the body. Uterus probably similar to that of Heterakis. 

 Eggs subglobular, almost always containing an embryo when ovi- 

 posited. 



Type-species. — Subulura acutissima Molin, 1860&. 



Seurat (1915e) states that Oxynema is a synonym of AUodapa^ 

 since O. rectum is identical with AUodapa ci^asslsplculum. Oxynema 

 is not regarded, therefore, as a subgenus of Subulura. 



ANALYTICAL KEY TO SPECIES OF SUBULUBA. 



1. Head simple Subulura andcrsoni, p. 52. 



Head with 3 lips 2. 



2. aiale 13 mm. long; from Caviu aperea Subulura uncinata, p. 53. 



Male less than 12 mm. long; from Euxerus enjthropus— Subulura boueti, p. 54. 



SUBULURA ANDERSONI (Cobbold, 1876) Railliet and Henry, 1914. 



Synonym. — Ascaris andersoni Cobbold, 1876. 



Specific diagnosis. — Subulura (p. 52) : Head simple and unarmed. 

 Body finely draAvn out in front and sharply pointed behind in both 

 sexes. 



Male attains a maximum length of 12.5 mm. Tail " furnished with 

 a minute oval-shaped spine at the tip." Two long arcuate spicules 

 slightly winged at the distal extremity (fig. 58). 



