PHYSALOPTERINAE 223 



Hab. Stomach of a Fish (one species known). 

 Genotype : H. heliconema Travassos, 1919. 



Travassos, 1919, Arch. Mus. Nac, Rio di Janeiro, xxii, 165. 



3. Thubunaea Seurat, 1914. 



Each lip armed with three teeth on the inner surface. 

 Tail of male with broad alae, supported by eight pairs of 

 pedunculate papillae, of which four pairs are preanal and 

 four pairs postanal. Five to seven pairs of subventral sessile 

 papillae also present. Spicules short, subequal. 



Hab. Stomach of Reptiles (one species known). 

 Genotype : T. pudica Seurat, 1914. 



Seurat, 1914, Compt. rend. Soc. Biol., Paris, Ixxvi, 724. 



4. Proleptus Dujardin, 1845. 



Syn. Spiropterina van Beneden, 1858 ; Coronilla van 

 Beneden, 1870; Histiocephalus Molin, 1860, e. p. 



Anterior end closely resembling that of Physaloptera. 

 Each lip with a single median conical tooth on its inner 

 surface. Tail of male with voluminous alae, supported by 

 eight to ten pairs of pedunculate papillae. Spicules unequal. 



Hab. Adults in stomach and intestine of Selachians, larvae 

 encapsuled in Decapod Crustacea. 

 Genotype : P. acutus Dujardin, 1845. 



Dujardin, 1845, Hist. nat. des Hehninthes, Paris, 105 ; Seurat, 

 1919, Bull. Mus. Hist, nat., Paris, No. 3, 166; Lloyd, 1920, 

 Proc. Zool. Soc, London, 449. 



Although acutus is designated by Stiles & Hassall (1905) 

 as the type of this genus, we have taken the characters for 

 the diagnosis largely from P. obtusus, the commoner and, at 

 present, better known species. 



5. Ochetocephalus v. Linstow, 1907. 



Head with two conical lateral lips, followed by a collar- 

 like fold of cuticle. Behind this, dorsally and ventrally, there 

 is a pair of longitudinal grooves. Oesophagus long. Tail of 

 male conical, with three pairs of preanal and two pairs of 

 postanal papillae, the two anterior preanal pairs having 

 slender peduncles. Spicules short, broad, equal. Tail of 

 female bluntly rounded, ending in a small spike. Vulva in 

 anterior region of body. 



Hab. Body-cavity of Ants (Camponotus). 

 Genotype : 0. javanicus v. Linstow, 1907. 



V. Linstow, 1907, Notes Leyden Mus., xxix, 82. 



