NEW TREMATODES FKOM REPTILES. 681 



place as the animal grows older. The average size of the ova in 

 young specimens was found to be the same as that in fully grown 

 specimens, and I am inclined to view with some doubt Odhner's 

 statement (2. p. 59) that the ova in Renifer sauromates Poir. 

 increase in size as the animal grows oldei-. 



From Lechriorchis elongatus Pratt, this species is distinguished 

 by having more unequal suckers, the ventral being decidedly 

 larger, the yolk-glands being more extensive, being present some 

 distance in front of the ventral sucker, and in having slightly 

 larger eggs. From L. primus Staff., it appears to be distinguished 

 by its much smaller eggs, its smaller ventral suckei-, and probably 

 in other respects. 



' The second lot of specimens consists of five from an Annulated 

 Snake [Leptodira annulata). They bear a close superficial resem- 

 blance to Lechriorchis vcdidus, but they do not belong to the same 

 genus. The only genus to which they can at present be referred 

 is Ochetosoina Braun, 1902, but they do not entirely agree with 

 the definition of that genus as given by Braun. In internal 

 anatomy they correspond quite closely, but they are not nearly so 

 flattened as 0. monstruosum Brn., the only species of the genus. 

 The only other genus to which they could be referred is Renifer 

 Pratt, 1903, but from that they differ radically in the configuration 

 of the uterus. 



OCHETOSOMA FORMOSUM, sp. n. (Plate XXVITI. figs. 6 & 7.) 



The body is elongated and slightly flattened. The length is 

 3'7-5-7 mm., and the greatest breadtla, about the ventral sucker, 

 is 1*1-1*6 mm. The breadth is therefore rather less than 4 of 

 the length. The body tapers gradually towards each end. 



In an average specimen (length 4-5 mm.) the oral sucker has 

 a diameter of "45 mm., i. e. jL of the body-length. It is globular 

 and subterminal. The ventral sucker is situated 1-7 mm. 'from 

 the anterior end. It is slightly oval, the transverse diameter 

 being -64 mm., and the longitudinal -57 mm. The sucker ratio 

 is therefore approximately 3:4. 



The cuticle is extremely deciduous ; in most of the specimens 

 it was almost entirely stripped off. Only in one was it intact, and 

 even then not completely so ; from this specimen the presence of 

 minute regular spines was determined. 



There is a short prepharynx followed by an almost globular 

 pharynx, measuring -Hx "16 mm. The oesophagus is about the 

 same length as the pharynx (-2 mm.), and the intestinal bifurcation 

 occurs well in front of the venti-al suckei*. The diveiticula 

 diverge pretty widely, and they terminate almost immediately 

 behind the ventral sucker, the ends being somewhat turned in. 

 They are narrow and irregularly dilated, but there is no crenation 

 on their inner wall as in Lechriorchis validus. They are lined by 

 low epithelium. 



The excretory system is almost identical with that in Lechriorchis 

 validus. The vesicle consists of a similar dorsal main stem, which 



