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A. Fam. Strongylidae Cobbold 1864. 



I. Genus Amphibiophilus gen. nov. 



In one of the test-tubes of the collection of Prol. Dogiel 

 and Sokolov were found some interesting Strongylidae (from 

 the intestine of amphibia of fam. Ranidae) in which were cu- 

 riously united characters belonging both to gen. Ainidosto- 

 miim Raill. et Henry 1909, and to gen. Ankijlostomimi 

 Dubini 1843. The cephalic end of these parasites was provi- 

 ded with a cup-like oral capsule, at the bottom of which sat 

 a large triangular denticle with the sharp end directed ante- 

 riorly. This corresponds to the type of the cephalic end in 

 Amidostomum. On the other hand the caudal bursa of the 

 male was provided witli ribs arranged nearly in tlie same 

 manner as in representatives of gen. Ankylosto?nu7n. I refer 

 these parasites to a new genus of Nematodes belonging to 

 fam. Strongylidae Cobbold 1864 which I name Amplii- 

 biophilus nov. gen. 



Diagnosis. 



Tender, filiform Nematodes the male and female of which 

 remain united in coitu for a long time, as is the case in gen. 

 Syngamus v. S i e b. 1836 as well. The cephalic end is provi- 

 ded with an oral capsule — the structure of whicli is similar 

 to that in Amidostomum Raill. et Henry 1909 — at the bottom 

 of which is situated a large triangular pointed denticle dire- 

 cted forwards. On the sides of the head are 2 lateral papil- 

 lae. The oesophagus is short (Vic — V23 part of body-length), 

 gradually widening towards its posterior end. The caudal 

 end of the male is provided with a bursa the ribs of 

 which are arranged as follows: costae anteriores consist of 

 2 ribs originating by common trunk; 3 costae mediae begin 

 by a common trunk from which costa anterior externa parts 

 separately, whereas costa lateralis media and costa lateralis 

 posterior again have a common trunk. The costae posteriores 

 externae are united with costa anterior into a common, very 

 short trunk forming independent elongated ribs; costa poste- 

 rior is dichotomically divided in the hinder quarter of its 

 lengtli, each of its branches forming at its end a trident. 2 

 spicula of equal length are composed of an anterior broad 

 and flat part, and of a posterior — narrow, cyhndrical part, provi- 



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