206 CYRENID.^v. 



The following are the dimensions of three specimens in the 

 British Museum Collection : — 



Long 



Lat 



Diam 



329. Cyrena tennentii, HaaJeij. 



Cyrena tennentii, Ilauley, P. Z. S. xxvi, 1858, p. 23 ; I'rime, Cat. 

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

 Chemnitz, 1879, p. 240. 



Original descrifttion :— Testa ovato-suhtrigona, solida, ventricosa, 

 inseqviilaterali, subla^vigata, epidermide tenni impolita fusco- 

 lutescente vestita : umbonibus tumidis, decorticatis, valde promi- 

 nentibus, vix obliquis ; latere antico anguste roturdato ; latere 

 postico longiore subattenuato, ad extremitatem obtuse rotundato ; 

 margine A'entrali arcuato ; margine dorsali antice declivi, convexo. 

 postice subdecliA'i, couvexinsculo ; lunula nulla; superficie interna 

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

 antico approximato, postico remoto : sinu palliari brevissimo, 

 acutissimo. 



Long. 27-75, lat. 38 mm. 



Hah. 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 

 umboues, has a redder tint ; there is neither a hiuule, nor any 

 indication of an unibonal ridge." 



330. Cyrena proxima. Prime. 



Cyrena proxima, Pria;e, Ann. Lye. Nat. Hist. N.Y. viii, 1864, 

 pp. S5-S6, fig. 34. 



Original description : — Testa ovato-suhorbiculari, suba^qui- 

 laterali, subinflata ; latere antico rotundato, postico subobtuso ; 

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

 nalibus angustis, divergentibus, majoribus bifidis ; umbonibus 

 parvulis, iutegris, inclinatis, incurvis, approximatis ; striis 

 obsoletis ; epidermide viridi, nitente induta. 



Long. 63, lat. 07, diam. 37 mm. 



Bab. 8iam ; Suliiian Island, Mergui {fide Brit. Mus.). 



The fo]loA\ ing note is appended to the description : — 



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

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

 subobtuse. The beaks are small, thej^ 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 o;ies are bifld. The anterior lateral tooth is 



