BIVALVE SHELLS. 251 



angustis, inaequalibus, majoribus profunde furcatis, lateralibus 

 inaequalibus, corapressis, aatico majore. 



CjTena incerta, Desh. Proc. Zool. Soc. 1854, 



Hab. ? Coll. Cuming. 



29. Cyrena Essingtonensis. B.M. 



C. testa ovato-suborbiculari, subtriangiilari, inaeqiulaterali, trans- 

 versim striata, striis inajqualibus, ejiidermide viridi-fuscescente, 

 postice nigrescente vestita ; antico latere breviore rotundato, 

 superne leviter arcuato, declivi, postico paululum angustiore ; 

 cardine angusto, insequaliter tridentato, dentibus prominen- 

 tibus apice profunde fissis, basi coarctatis, subpediculatis, den- 

 tibus laterabbus parvus, antico majore eonico, fossula valvulae 

 dextrje profunda, superne canaliculata, dente cardinali ejusdem 

 valvule obUque prominente. 



Cyrena Essingtonensis, Desh. Proc. Zool. Soc. 1854. 



Hab. Poi-tus Essingtoniensis {Cuming). Coll. Cuming. 



30. Cyrena Jukesi. B.M. 



C. testa ovato-trigona, turgidula, inaequilaterali, transversim ir- 

 regulariter striata, epidermide nitida flavicante pallide vires- 

 cente et brevissime laminata vestita, latere antico brevi, su- 

 perne fere rectilineo, declivi, postico rotundato, superne con- 

 vexiusculo ; valvis intus albis, umbonibus minimis, brevibus, 

 antice obliquatis ; cardine angusto tridentato, dentibus sub- 

 ajqualibus, duobus majoribus apice bifiilis, angustis, lateralibus 

 suba^qualibus, conicis, compressis. 



Cyrena Jukesi, Desh. Proc. Zool. Soc. 1854. 



Hab. Caput Upstart dictum Australise septentrioualis. 



c. Testa suborbicularis. 



31. Cyrena suborbicularis. B.M. 



C. testa suborbiculari, valde inaequilaterali, alba, sub epidermide 

 viridi i-egulariter concentrice lamellata, apicibus prominulis. 

 integris; margine dorsali utroque rotundato, postico anticum 

 sesquies sequaute, ventrali valde arcuato ; dentibus cardinalibus 

 ternis, binis bifidis ; lateralibus brevibus, la;vibus. {Phil.) 



Cyrena suborbicularis, Phil. Abbild. Conch, p. /• pi- 2. f. 1. 



Hab. Manilla. 



