TRICHINELLINAE 237 



Hab. Adults in glands of proventriculus of Birds, mostly 

 fish-eaters. Larvae in connective tissue of Fishes and ( ?) 

 Crustacea. 



Genotype : E. [Strongylus] tubifex (Nitzsch, 1819). 



Nitzsch, in Rudolphi, 1819, Entozoorum Synopsis, 31 ; 

 Jagerskiold, 1909, Nov. Act. Reg. Soc. Sci. Upsala, ii, No. 3, 

 45; Ciurea, 1924, Zeitschr. f. Fleisch-und-Milchhyg., Berlin, 

 xxxiv, 134. 



3. Hystrichis Dujardin, 1845. 



Forms of medium or rather large size. Head usually more 

 or less swollen, sometimes subspherical. Body cylindrical, or 

 swollen in its middle portion. Cuticle coarsely striated towards 

 the extremities and bearing spines, which may be confined to 

 the anterior region of the body, or to the swollen head. Mouth 

 surrounded by a single circle of six papillae. Vulva close to 

 anus. 



Hab. In glands of proventriculus of aquatic or semi-aquatic 

 Birds. 



Genotype : H. tricolor Dujardin, 1845.* 



Dujardin, 1845, Hist. nat. des Helminthes, Paris, 290 ; 

 Jagerskiold, 1909, Nov. Act. Reg. Soc. Sci. Upsala, ii, No. 3, 46. 



Order V. TRICHINELLOIDEA Hall, 1916. 



Body more or less clearly divided into an oesophageal portion 

 and a posterior portion which contains the other organs. 

 Oesophagus a cuticular tube embedded in a single chain of 

 cells. Anus terminal or subterminal in both sexes. Male 

 with a single spicule or none. Vulva at junction of oesophageal 

 and posterior portions of body. A single ovary and uterus. 



This group, although it contains oialy a small number of 

 genera, consists of very highly-specialized forms. The sub- 

 families are necessitated by the wide divergences between 

 the genera. 



Fam. 1. TRICHINELLIDAE Stiles & Crane, 1910. 

 With the characters of the Order. 



Subfam. 1. TRICHINELLINAE Ransom, 1911. 



Male without spicule or spicule-sheath. Female ovovivi- 

 parous. Egg spherical, without true shell but surrounded hy a 



* Jagerskiold (1909) designates H. acanthocephalicus (Molin) as 

 genotype. Dujardin's genus contained only one species, H. tricolor, 

 which therefore must be the type. 



