206 CYBENIDJB. 



The following are the dimensions of three specimens in the 

 British Museum Collection : 



1. 2. 3. 



Long. . , 47-25 42 41-25 mm. 



Lat 52-5 48 43 mm. 



Diam 31-75 26-5 28 mm. 



329. Cyrena tennentii, Hanley. 



Cyrena tennentii, Hanley, P. Z. S. xxvi, 1858, p. 23 ; Prime, Cat. 

 Corbiculidse, 3869-70,' p. 148, no. 75; Clessin, in Martini & 

 Chemnitz, 1879, p. 240. 



Original description : Testa ovato-subtrigona, solicla, ventricosa, 

 insequilaterali, sublsevigata, epidermide tenui impolita fusco- 

 lutescente vestita : umbonibus tumidis, decorticatis, valde promi- 

 nentibus, vix obliquis ; latere antico anguste -rotundato ; latere 

 postico longiore subattenuato, ad extremitatem obtuse rotundato ; 

 margine ventrali arcuato ; margine dorsali antice declivi, convexo, 

 postice subdec]ivi, convexiusculo ; lunula nulla ; superficie interna 

 albido-violascente ; dentibus lateralibus brevibus, validis, x obtusis ; 

 antico approximate, postico remoto : sinu palliari brevissimo, 

 acutissimo. 



Long. 27-75, lat. 38 mm. 



Hob. Ariho River (flowing into the Gulf of Manaar), Ceylon. 



In a note appended to the description the author states that 



" the hinge-margin is strong, and the cardinal teeth of 



the right valve peculiarly large. The inner disk, beneath the 

 umbones, has a redder tint ; there is neither a lunule, nor any 



indication of an umbonal ridge." 



j 



330. Cyrena proxima, Prime. 



Cyrena proxima, Prime, Ann. Lye. Nat. Hist. N.Y. viii, 1864, 

 pp. 85-86. fig. 34. 



Original description : Testa ovato-suborbiculari, suba2qui- 

 laterali, subinflata ; latere antico rotundato, postico subobtuso ; 

 pagina interna candidissima; cardine crasso, lato ; dentibus cardi- 

 nalibus angustis, divergentibus, majoribus bifidis ; umbonibus 

 parvulis, integris, inclinatis, iucurvis, approximatis ; striis 

 obsoletis ; epidermide viridi, nitente induta. 



Long. 63, lat. 67, diam. 37 mm. 



Hob. Siam ; Sulinan Island, Mergui (fide Brit. Mus.). 



The following note is appended to the description : 



"The shell is oval-suborbicular, nearly equilateral, and some- 

 what inflated. The anterior side is rounded, the posterior is 

 subobtuse. The beaks are small, they curve inwardly and are 

 approximate. The valves are solid. The interior is white. The 

 hinge is broad. The cardinal teeth are narrow and divergent, 

 the two principal ones are bifid. The anterior lateral tooth is 



