— 140 — 



mined and corrected bj modern authors, and determined 

 exactly and definitely. The .correction" of such diagnoses, 

 according to our modern views on the structure of Nemato- 

 des, presents one of the taslvs of modern helminthology which 

 requires immediate sohition. 



Thus, the following species must for certain be referred 

 to the genus Oxysoma Schneider 1866 the diagnosis of 

 which is given below: — 



1. Oxysoma hrevicaudata Zed. (type!) 



2. Oxysoma contortum L i n s t o w 1906. 



3. Oxysoma ungiiicidatum (Linst. 1906). 



4. Oxysoma perezi Gendre 1911. 



The fifth representative of this genus is a new species 

 from the collection of Prof. Dogiel and Sokolov: 



Oxysoma dogieli nova spec. 



Diagnosis of the genus Oxysoma Schneider 1866. 



Nematodes of the type of Meromyarii and Secernentes. 

 Moutli surrounded by 3 small lips (dorsal and 2 lateroventral), 

 sometimes undistinguishable. The oesophagus terminates by 

 a bulb provided with a denticular apparatus. The tail of the 

 male is pointed with 3—12 pairs of preanal and — 6 pairs of 

 postanal papillae. 2 spicula of equal size, simple, curved, 

 much longer than the gubernaculum; the gubernaculum is 

 small, canoe-shaped. The vulva is situated posteriorly from 

 the middle of the body-length. The eggs contain a ready 

 embryo curled into a ring. Parasitic in the alimentary tract 

 of amphibia and reptiles. 



Typical species: Oxysoma brevicaudata (Zed. 1803). 



20. Oxysoma dogieli nova spec. 



Host: a representative of fam. Bufonidae. 



Occurence: intestine. 



Body white, tender, of cylindrical form, attenuated at both 

 ends. Cuticle finely striated in transverse direction. Oral end 

 provided with 3 small lips: one dorsal, and 2 ventrolateral. 

 On each lip are arranged 2 small papillae forming a circle of 

 6 papillae: 2— lateral and 4— submedial, one pair of submedial 

 papillae belonging to the dorsal lip, and the other pair com- 

 posed of the adjoining papillae of the ventrolateral lips. The 



