— 118 — 



ded at the end with a small bent hook composed of 2 bran- 

 ches. The caudal end of the female is thin, pointed. The 

 vulva is situated in the hinder half of the body, between the 

 third and last quarter of its length. 2 ovaries. Parasitic in the 

 alimentary tract of amphibia. Type and until present the only 

 species Amphibiopliiliis acanthocirratus nova spec, from the 

 intestine of a representative of fam. R a n i d a e. 



1. Amphibiophilus acanthocirratus n. sp. 



Host: a frog from fam. R a n 1 d a e. 



Occurence: intestine. 



Description of the species. 



Body thin, filiform, cylindrical, very tender. The male and 

 female of all specimens investigated were in coitu, the male 

 being so closely united with the female as to resemble the 

 representatives of gen. Syngamus v. S i e b o 1 d. 



Male. Length of body reached 7,14—7,40 mm., at a width: — 

 n the region of the hinder part of the oesophagus =o,085 mm., 

 in the hinder part of the body =0,1 mm. and in the re- 

 gion of the anus = 0,09 mni. The round mouth opening is 

 continued into a cup-shaped oral capsule with a rounded bot- 

 tom in the middle of which rises a conical denticle directed 

 with the point forwards and reaching the upper edge of the 

 capsule with its apex. The width of the oral capsule reaches 

 0,051 mm. The mouth opening is surrounded by 6 papillae: 

 2 lateral and 4 submedian. The surface of the cuticle is 

 slightly striated longitudinally. The oesophagus is short, oc- 

 cupying ^/ic part of the body-length (length of oesopha- 

 gus = 0,425 — 0,45 mm.). At the commencement it is cylin- 

 drical, then it gradually widens forming at the posterior end 

 of the oesophagus a club-shaped bulb. The caudal end of 

 the male is provided with a biu'sa copulatrix supported by 

 symmetrically arranged ribs. Costa e anteriores are double 

 with a common trunk for both. 3 costae mediae are united 

 into a common trunk, the costa anterior externa being si- 

 tuated separately from the two hinder ribs, whereas costa 

 lateralis media and costa lateralis posterior are fused into one 

 in their basal* part. Costae posteriores externae are connected 

 with costa posterior by a short trunk from which, however, 

 they soon depart, forming independent, thin, elongated ribs; 



