1921.J N. Annandale & R. B. S. Sevvell; I'ivipani. 291 



in two out of six examples of Vivipara dissiinilis taken from 

 swamps near Bomba}-, and in nine out of eighteen examples of 

 this species taken from a small ditch at Rambha, Ganjam ; but in 

 these latter cases the cysts were degenerating. 



Yet another trematode may find a temporary resting place 

 in Indian species of Viviparidae. Examples of Lecythoconcha 

 kcythis and Vivipara oxytropis brought from the Loktak Lake, 

 and of an undescribed species allied to V. oxytropis from Dimapore. 

 Assam, were infected with trematode cysts in the mantle. These 

 cysts were oval in shape, and were situated beneath the external 

 or shell surface just behind the thickened mantle margin. The 

 cyst-wall was thick and gelatinous and appeared to open by a single 

 aperture on the shell surface of the mantle. Contained within 

 these cysts were small examples of a species of Urogoniinus Mont. 

 [==Leii'COchloridiiim Carus], I am else\^here publishing an account 

 of this species (vide Sewell, " Cercariae Indicae," Ind. Journal Med. 

 Research) ; suffice it to say liere that these trematodes measure 

 2-3 mm. in length, are of a deep orange-red colour and have a 

 prominent ventral sucker with a diameter twice that of the oral 

 sucker. Filippi (1855, p. 353, footnote) has recorded finding free 

 distomes, which possess all the above characters, in examples of 

 Vivipara vivipara taken from the Lake of Varese, Ital)'. As regards 

 their distribution in the mollusc host he remarks, "lis n'ont pas 

 de place fixe, et souvent je les ai vu sur le manteau de Tanimal." 

 It is of course impossible to be certain on the point, but it seems 

 by no means unlikely that he was also dealing with an intermediate 

 stage in the development of a species of Leitcochloridium in the 

 European Vivipara, 



REFERENCE LLST. 



Annandale, N., 19 1 1 .. "Freshwater Polyzoa.'' Fauna Bnt. 



Ind., Freshwater Sponges, etc. Lon- 

 don. 



Annandale, N., 1918 . . " Aquatic Molluscs of the Inle Lake 



and connected waters." Rec. Ind. 

 Mus. XIV, pp. 103-182, 10 pis. 

 Calcutta. 



Annandale, N., 1920(17) " Observations on Physa principii Sow- 



erby and on a Clionid sponge that 

 burrowed in its shell.' ' Rec. Geol. 

 Survey Ind. LI, pp. 50-64, 2 pis. 

 Calcutta. 



Annandale, N., 1920(6) "The Apple-Snails of Siam." Jonrn 



Nat. Hist. Soc. Siam IV, pp. i — 24, 

 2 pis. Bangkok. 



Baker, F. C, 1911 .. "The Lymnaeidae of North and Mid- 

 dle America." Chicago Acad. Sci., 

 Special Pub. No. 3, pp. 1-539, 58 

 pis. 



