NEW TREMATODES FROM REPTILES. 683 



they vary in length from -034 mm. to -042 mm. by '017 mm. to 

 •021 mm. in breadth. The average is about "4 x "2 mm. 



In this species, again, no case of amphitypy was observed, and 

 the only pronounced variation was in respect of the posterior 

 limit of the yolk-glands as described above. 



The species obviously presents a close resemblance to the genus 

 Renifer Pratt, sens, sti^ict. In the shortness of the intestinal 

 diverticula, the symmetrical situation of the testes, and the 

 extreme lateral position of the genital aperture, the agreement is 

 complete. The essential difference lies in the configuration of the 

 uterus. Renifer elliplicus Pratt, the type species, is unfortunately 

 not fully grown and the ultimate disposition is not apparent. In 

 R. saioromates Poirier, the uterus is of the same type as in 

 Lechriorchis validus, and if this be taken as characteristic of the 

 genus, then O.formosuin must be separated from that genus. 



It is evident that the tln^ee genera Renifer, Lechriorchis, and 

 Ochetosoma are somewhat closely related, and they differ from all 

 the other members of the familj- Lepodermatidje in the extreme 

 lateral and forward position of the genital aperture. They 

 evidently form the nucleus of a group, but the extremely profuse 

 variety met with in the family renders it somewhat difficult to 

 divide it into definite subfamilies. Provisionally, however, these 

 three genera may be classified under Pratt's subfamily Reniferinje. 

 That Fneumatophilus Odhn., and Lepto^ihallus Llihe, are to be 

 included along with these, as Odhner has indicated (2. p. 56), 

 appears to me somewhat doubtful. 



The third form which I have to describe here is one of very 

 great interest. It was obtained from a Diamond Water-snake 

 {Tropidonotus rhombifer) from North America. The habitat, 

 unfortunately, is not recorded. It bears a certain resemblance to 

 the foregoing species, and belongs to the family Lepodermatidaj, 

 but it possesses an individuality sufficiently marked to constitute 

 a distinct generic type. 



Dasymetra conferta, gen, et sp. n. (Plate XXVIII. figs. 8-10.) 

 The collection consisted of about a dozen specimens, all of which 

 were mature, and measured 3"5-4'6 mm. in length. The body is 

 elongated, slightly flattened and of fairly uniform breadth. The 

 greatest breadth occurs about the middle and is 1-1*4 mm. The 

 length is therefore about 3| times the breadth. The cuticle is 

 beset throughout its whole extent by long sti^aight spines. It 

 appears to be somewhat deciduous, and in many specimens is 

 absent from a considerable part of the body, especially towards 

 the posterior end. Several specimens, however, retained the 

 cuticle and spines quite intact. 



In a specimen of average length (4-2 mm.) the oral sucker 

 measures '56 mm. in diameter. It is globular, almost terminal 

 and not very muscular. The ventral sucker is practically of equal 

 size, if anything a trifle less. It is somewhat transversely oval, 

 the dimensions being -52 x '57 mm. It is only slightly prominent, 



