182 



PLATHELMINTHES 



Fig. 297 — Param- 



phistomum cervi 



(from Braun). 



Division 2. AMPHISTOMATA. 



Body often more or less conical, with the oral sucker at the front 

 end and the acetabulum at the hind end of the body; intestine bifur- 

 cate, the pharynx often having a pair of lateral pockets; testes 1 or 

 2 in number, large, and situated in front of the small ovary; yolk 

 glands usually large; genital pore in the forward 

 part of body: in all classes of vertebrates, usually 

 in the digestive tract; 3 families. 



Family PAEAMPHISTOMIDAE. 



With the characters of the division: 8 genera. 

 1. Paramphistomum Fishoder. Oral sucker 

 rudimentary; acetabulum large, with the excretory 

 pore just dorsal to it; no pharyngeal pockets: in 

 the stomach and intestine of 

 vertebrates, principally mam- 

 mals; about 25 species. 

 P. cervi (Zeder) (P. conieum Zed.) (Fig. 

 297). Body conical, 10 mm. long: in stomach of 

 sheep and cattle; rare in this country. 



2. DiPLODiscus Diesing. Acetabulum large, 

 with the excretory pore in its center; pharyngeal 

 pockets present: in rectum of amphibians; sev- 

 eral species. 



D. temporatus* Stafford (Fig. 298). Body 

 conical; about 3.6 mm. long: in rectum of frogs; 

 not uncommon. 



Division 3. DISTOMATA.t 



Body flattened or cylindrical and often cov- 

 ered w^th minute spines, with the oral sucker 

 at the front end and the acetabulum in the ven- 

 tral surface; intestine, with a few exceptions, 



bifurcate, the 2 trunks being either short or long and branched or 

 simple; usually a pair of testes (in a few species several pairs) ; a single 

 ovary, which is smaller than either testis, and often a large receptaculum 



Fig. 298 — Diplo discus 



temporatus (Gary). 



References 



as in Fig. 293. 



* See "The Life History of Diplodiscus temporatus," etc., by L. R. Gary, Zool. 

 Jahrb. Abt. f. Anat., Vol. 28, p. 595, 1909. 



t See "An Inventory of the Genera and Subgenera of the Trematode Family 

 Fasciolidae," by C. W. Stiles and A. Hassall, Arch, de Paras., Vol. 1, p. 81, 1898. 

 "Weitere Beitrjige zur Kenntniss der Treraatoden Fauna ^gyptens," etc., by A. 

 Looss, Zool. Jahrb. Abt. f. Sys., Bd. 12, p. 521. "Nachtrilgliche Bemerkungen," etc., 

 by A. Looss, Zool. Anz., Bd. 23, p. 601, 1900. 



