NECATORINAE 171 



Monodontus amounts to a designation by Railliet himself of 

 B. trigonocephalum as the type of that genus, and rejects 

 Stiles & Hassall's (1905) designation of M. semicircularis 

 as type. There seems to be no justification for this con- 

 clusion. Railliet's statement that Molin had designated 

 trigonocephalum as type Avas merely incorrect, and cannot 

 be taken as a definite designation on his own part. 



5. Monodontus Molin, 1861. 



Syn. Eumonodontus Railliet, 1910, Cameron, 1923. 



(For discussion of nomenclature, vide Bunostomum, supra). 



Body stout, fusiform. Head bent slightly dorsally. A 

 mouth-collar, raised into a ventral and two lateral lobes, 

 apparently present. Buccal capsule cup-shaped, containing 

 a small, prominent, dorsal tooth (cone?). Cervical papillae 

 spine-like. Bursa very large, entire, with small, symmetrical 

 dorsal lobe. Genital cone well developed. Externo-dorsal 

 rays symmetrical. Terminal branches of dorsal ray bidigitate. 

 Spicules alate and transversely striated, apparently fused 

 distally and with a spatulate termination. Vulva a little 

 behind the middle of the body. Uterine branches opposed. 



Hab. Small intestine of Peccary (one species known). 

 Genotype : M. semicircularis Molin, 1861. 



Molin, 1861, Mem. R. 1st. Veneto, ix, 469; Railliet, 1910, 

 Bull. Soc. Path, exot., Paris, iii, 314. 



This genus is imperfectly known, but is apparently quite 

 distinct from Bunostomum. It bears a much closer resem- 

 blance to Necator, and may even be synonymous with that 

 genus. 



6. Gaigeria RailHet & Henry, 1910. 



Buccal capsule large, cup-shaped. At its base a freely- 

 projecting dorsal cone carrying the dorsal gutter, and a pair 

 of ventral lancets. Bursa with a large dorsal lobe and two 

 much smaller lateral lobes which are joined together ventrally. 

 Antero-lateral ray widely separated from the remaining 

 lateral rays. Externo-dorsal rays leave the main trunk of 

 the dorsal ray in front of its bifurcation. Dorsal ray cleft 

 for about a quarter of its length. Its terminal branches are 

 tridigitate. Spicules slender, recurved distally, not barbed. 

 Vulva just in front of the middle of the body. 



Hab. Alimentary tract of Ruminants. 



Genotype : G. pachysceUs Railliet & Henry, 1910. 



Railliet & Henry, 1910, Bull. Soc. Path, exot., Paris, iii, 

 313; Cameron, 1924, Journ. Helminthol., ii, 41. 



