— Ill — 



VIII. Gen. Mesorchis Dietz 1909. 

 8. Mesorchis denticulatus (Rud. 1819). 



This species, wliicli had been Icnown a long time, is para- 

 sitic in the intestine of sea-gulls. It occnred in the collection 

 of Prof. Dogiel and Sokolov (from — Larus sp. killed on the 

 lake Victoria-Nyanza) together with a larval form of Diplo- 

 stomum sp. 



G. Fam. Holostomidae Brandes. 



IX. Gen. Diplostomum v. Nordm. 

 9. Diplostomum spec. 



This is a free larva from the intestine of Larus sp. It 

 seems that the sea-gull was infected by this parasite through 

 a fish, and the parasite did not yet develop into the adult 

 stage in the organism of his final host. 



The body is nearly round, flat, very tender, reaching 

 0,9 mm. in length* at a width of 0,05 mm. The ventral suc- 

 ker situated at a distance of 0,53 mm. from the anterior end 

 of the body (in its posterior half) is 0,068 mm. in diameter. 

 The oval pharynx is 0,05 mm. long and 0,084 mm. wide. 

 Laterally to the oral sucker are arranged 2 small auricular 

 invaginations. Unfortunately, it is impossible to determine 

 the species of this parasite more definitely. 



B. Parasitic Nematodes. 



The parasitic Nematodes from the collection of Prof. V. Bo- 

 gie] and I. Sokolov belonged to 26 species taken from 30 dif- 

 ferent hosts. 



These species represented 14 genera and 7 families. Amongst 

 the hosts of the parasitic Nematodes were representatives not only 

 of all the classes of vertebrates but even two species of my- 

 riapods. 



In the present work I am describing 12 new species of 

 which two parasites represent two new genera. The folowing 

 is a list of these parasites: — 1) Amphibiophilus acantliocirra- 

 tus n. g, n. sp. (from a representative of fam. Ranidae); 2) 

 Ascaris sebrae n. sp. (from the intestine of a zebra); 3) 

 Orneoascaris chrysanthemoides n. g. n. sp. (from the intestine 



