— 107 — 



to the ventral sucker; whereas in the African variety the 

 anterior testis occnpies the same position like the posterior 

 testis of Klein's parasite; as concerns the posterior testis of 

 the African parasite, it is situated posteriorly to the ventral 

 sucker. The ovary is also differently localized in both forms: 

 in the Indian species the ovary is situated to the rigid from 

 the ventral sucker, adjacent to the right trunk of the intestine 

 (in the same position as the posterior testis in var. africana!), 

 and in the African variety the ovary lies to the left from the 

 median body-line, posteriorly to the ventral sucker. 



D. Fam. Dicrocoeliidae Odhner. 



In the collection of Prof. D o g i e 1 and S o k o 1 o v there 

 is one representative of the subfamily Dicrocoeliidae 

 (from the intestine of a chamaeleo) belonging to the genus 

 Mesocoelium Odhner 1911. Until pre&ent there was only 

 one species — Mesocoelium sociale (Lilhe 1901) ^) belonging 

 to this genus. Thus, our parasite — Mesocoelium soJwlowi n. sp. 

 is the second species of this genus. 



IV. Genus Mesocoelium Odhner 1911. 



4. Mesocoelium sokolowi nova spec. 



(Tab. I, fig. 3). 



This species was found in the middle part of the intestine 

 of one of the chamaeleos (M 8). 



Body flat, linguiform, narrowing towards the hinder end. 

 Length of body 3,7 — 4,335 mm. at a maximum width 1,36 — 

 1,70 mm. In some specimens the anterior part of the body 

 was widened, resembling the drawing of Distomum sociale in 

 the work of Liihe 1901. The surface of the cuticle is armed 

 with small scale-like spines. The ventral sucker is arranged 

 on the border of the first and second quarters of the length 

 of the body, just as in Mesocoelium sociale. The dimensions 

 of the ventral sucker are smaller than those of the oral. 

 The oral sucker attains 0,4 — 0,45 mm. in transverse section, 

 the ventral sucker is 0,255—29 mm. in length and 0,29— 

 0,32 mm. in width. The spherical pharynx attains 0,17—0,20 mm. 



1) L ii h e. Zwei neue Distomen aus indischen Aniiren. Centralbl. f. Bakt. 

 Parasitenk. 1901, Bd. XXX Grig. p. 171—173, Fig. 5. 



