— 123 — 



in the region of the anus was 0,68 mm., in the middle part 

 of the body— 1,3— 1,5 mm. The anal aperture is situated at a 

 distance of 0,39 mm. from the caudal end. The tail is rounded 

 and provided with a small conical process, 0,034 mm. long. 

 The genital aperture is situated somewhat posteriorly to the 

 middle of the body-length. The eggs are round-oval, 0,085 — 

 0,09 mm. in length and 0,068—0,072 mm. in width. The egg- 

 shell in finely punctuated. 



Until present only the common horse ascaris — Ascaris 

 megalocepUala Cloquet 1824 — has been found in the inte- 

 stine of the zebra. 



IV. Gen. Trispiculascaris gen. nov. 



The investigation of the parasite Ascaris helicina Molin 

 1860 from the intestine of the crocodile led me to separate 

 it from the genus Ascaris L. into a new" genus named by 

 me Trispiculascaris gen. nov. 



I consider the main peculiarity of this new genus to be 

 the original structure of the caudal part of the body in the 

 male, which is characterized by the following: — 1) the pre- 

 sence of a gubernaculum usually not found in Ascaridae, 

 2) the presence of a limited number of preanal papillae (only 

 4 pairs), there usually being scores of them in Ascaridae, 

 and 3) the presence of alate diverticula of the cuticle in the 

 region of the caudal end of the male. Those characters, toge- 

 ther with the structure of the oral organs (lips) and of the 

 alimentary canal give our parasite quite a definite position 

 in the sub-family Ascarinae Raill. et Henry 1912. 



I propose the following diagnosis for this genus: 



Small Ascaridae with rather large hps provided with 

 auricular outgrowths on the sides; a dentated margin as well 

 as intermediary lips are present. The oesophagus and intestine 

 are simple, without blind diverticula. The caudal end of the 

 male is strongly bent and provided with wide alae and very 

 few preanal and postanal papillae arranged in one row on both 

 sides of the body. 2 fine, thin spicula of equal size; guberna- 

 culum present. The tail of the female is straight, conically poin- 

 ted. The vulva is situated in the anterior half of the body. 

 Parasitic in the alimentary tract of reptiles. Type and mean- 



