﻿CTRENA.— Plate XL 



The bated Cyeena. Shell elevated, obliquely snb- 

 trigonal, tnmid, regnlarly rather distantly 

 ridged, radiately banded within on each side 

 with purple ; anterior side rather short, with a 

 depressed lunular area; posterior side a little 

 produced obliquely, radiately angular ; umboes 

 elevated, acuminated, lateral naargins sloped. 



Hanley. ? MS. 



Hah. ? 



Species 48. (Mus. Hanley.) 



Cyrexa occiden'S. C/'yr. testa ovatd, suhcompressd 

 subdqiir.-'i,:!, iinr,p(!hiii-rali, lids suhdistantihus, 

 requ'.arihii>: ro,irr,ilrirc rugatd; intus purpurea, 

 subtus vmhniir.^ triradiatd; apice cceruleo ; epi 

 dermide nitenti, suhviridi ; latere antico brevius 

 culo, cceruleo, uniradiato ; latere postico pauU 

 producto, subattemoato, ad ternnnum subtrimcato. 



The sdn-set Cyeena. Shell ovate, slightly com- 

 pressed, slightly depressed, inequilateral, con- 

 centrically wrinkled with rather distant, regular 

 ridges ; purple within, three-rayed under the 

 umboes ; apex blue ; epidermis shining, greenish ; 

 anterior side rather short, with a single ray of 

 blue ; posterior side a little produced, rather 

 attenuated, slightly truncated at the end. 



Benson. Deshayes, Cat. Mus. Brit. 



Sikkim, Bundelkund. 



The umbonal rays from which the name is derived 



r.rc not always present in the specimens. 



Species 49. (Mns. Hanley.) 



Cyrena striatella. Cyr. testa suhovatd, suhciridi, 

 subcceruled, subiiiflatd, ; distanter regulariter 

 rugatd; umbonihus moderate elevatis; intiis pur- 

 purea ; latere antico breviiisculo, rotundo, unira- 

 diato; latere postico producto, subtruncato ; maryine 

 dorsali utrivque declivi. 



The small-striated Cyrena. Shell subovate, greenish, 

 rather blue, slightly inflated, distantly regularly 

 wrinkled ; umboes moderately raised, purple 

 within ; anterior side rather short, rounded, 

 single-rayed ; posterior side produced, slightly 

 truncated ; dorsal margin sloped on each side. 



Deshates. Proc. Zool. Soc. 1854, p. 344. 



Hub. Pondicherry. 



Species 50. (Mus. Hanley.) 



Cyrena Bengalensis. Cyr. testa parvd, ovatd, roseo- 

 fulvd, tenuiter liratd, compressa ; latere antico 

 angusto, subacuminato, breviuseulo ; latere postico 

 })aulb viagis producto ; umbonibus moderate declivi- 

 bus. 



The Bengal Cyrena. Shell small, ovate, pinky- 

 fulvous, finely ridged, compressed; anterior side 

 narrow, rather acuminated ; rather short ; pos- 

 terior side a little more produced; umboes 

 moderately sloped. 



Deshayes. Proc. Zool. Soc. 1854, p. 344. 



Hah. River Jumna. 



