— 121 — 



The straw-yellow gubernaculiim has the shape of a deep ca- 

 noe with the anterior and posterior ends pointed; the bottom 

 of the gubernaculum is provided with a longitndinal slit-lilve 

 opening in its anterior part; witJi its sides the gubernaculum 

 tightly embraces the spicula allowing them to slide only in 

 one definite direction. 



B. Fam. Ascaridae Cobbold 1864. 



III. Genus Ascaris L. 1758 (sens. lato). 

 3. Ascaris euxina Linst. 1903. 



Until the present this species was described only once by 

 Linstow from the stomach of Pelecanus minor Rupp. In 

 the collection of Dogiel and Sokolov this parasite was taken 

 from a new host — Phalacrocorax sp. 



To the brief, but exact description of Linstow I shall add 

 only the measurements of the spicula in the male. In the 

 specimen investigated by me they were 1,15 mm. long and 

 0,017 mm. wide in their middle part. The spicula are slightly 

 bent ventrally; posteriorly from the middle of their length 

 the spicula are provided with a small alate outgrowth which 

 gradually disappears. The tips of the spicula are rounded. 

 The number of postanal papillae in the male reaches 12 pairs, 

 as was shown by Linstow; however, one of these papillae, 

 situated most medially, is double. This Avas not mentioned by 

 Linstow in his description. 



4. Ascaris filaria Dujardin 1845. 



Until the present this species was described from the 

 following hosts: — 



1) Astrophis tigris, 



2) Python reticulatus, 



3) Python sebae. 



In the collection of Dogiel and Sokolov this species is 

 taken from a new host — Bitis gabonica. 



5. Ascaris zebrae nov. spec. 



This new species is parasitic in the intestine of the zebra. 

 The cuticle is transversely striated; the cephalic extremity is 



