936 ON A NEW REPTILIAN TREMATODE. 



The cap is not very conspicuous until the egg is open. The eggs 

 (fig. 2) measure "033 mm.-'036 mm. x '021 mm. — '023 mm. The 

 vitellaria are variable in length, but never reach beyond an ex- 

 tremely short distance in front of the ventral sucker, 0*02 mm. is 

 quite the furthest they ever reach and usually it is not so much. 

 Posteriorly they reach to about the middle of the testes, but are 

 exti'emely variable in this region, and the left may reach to 

 behind the left testes and the I'ight hardly reach to the anterior 

 portion of the right, or both may reach to the level of the middle 

 of the testes. The vitellarian follicles are in small groups lying 

 laterally to the outside of the intestinal casca ; small ducts from 

 them unite in a transverse duct each side lying just behind the 

 ovary, and these unite in a small reseivoir in the centre of the 

 body which gives off the vitellarian duct to the oviduct. 



Lechi'iorchis validus Nicoll is undoubtedly the most nearly 

 related to the present species. L. inermis differs from it chiefly 

 in its much smaller eggs and position of the vitellaria. The 

 position of the testes (right in front of left instead of the reverse) 

 and of the vesicula seminalis being rather more variable, do not 

 seem to be such important specific characters. 



References. 



NicoLL, W. (1911). — On Three New Trematodes from Reptiles. 



Proceedings of the Zoological Society of London, pp. 677- 



681. 

 Stafford, J. (1905). — Trematodes from Canadian Vertebrates. 



Zoologischer Anzeiger, xxviii. p. 691. 



EXPLANATION OF PLATE XCIII. 



LechriorcMs inermis, sp. ii. 



The following letters applj- to all the figures. 



C.S. Cirvus-sac. j R.S.U. Keceptaculuni seminis 



E.P. Ex'cretory pore. ; uterinum. 



E.V. E\-cretory vesicle. | S.GL. Shell-gland. 



G.P. Genital pore. T. Testis. 



I. Intestine. 

 O. Ovary. 

 QlS. GEsophagus. 

 O.S. Oral sucker. 

 PH. Pharynx. 

 P. PH. Prepharynx. 



U. Uterus. 

 V. Vitellaria. 

 VG. Vagina. 

 V.S. Ventral sucker. 

 V.SEM. Vesicula seminalis. 



Fig. 1. Ventral view. Length 5"4 mm. 



2. Eggs, length •033 mm. 



3. Transverse section through unpaired portion of excretory vesicle and teste.'; 



showing intestinal casca irregularly placed. 



4. Transverse section through ventral sucker. 



