240 BIVALVE SHELLS. 



elongato, dentibus obliquis ; dente laterali antieo cardine 

 proximo irregulariter sulcato, ])osticali angusto cardine remo- 

 tissimo. 



Batissa megadesma, Desh. Proc. Zool. Soc. 1844. 



Hab. ? 



16. Batissa atrata. 



B. testa orbiculari, sublenticulari, sequilaterali, transversim obso- 

 lete striato-sulcata, intus extusque aterrime violacea ; umboni- 

 bus brevibus minimis, oppositis, approximatis, apice decorti- 

 catis ; valvis tenuibus ; cardine angusto, insequaliter tridentato ; 

 dente antico in utraque valva angusto ; dentibus lateralibus 

 brevioribus, angustis, oblique sulcato-rugosis ; impressione 

 pallii postice leviter inflexa. 



Batissa atrata, Desh. Proc. Zool. Soc. 1854. 



Hab. ? 



Genus 3. VELORITA. 



Animal ignotum. 



Testa alta, crassa, solida, cordiformis, epidermide nitente ves- 

 tita, postice truncata, angulata; cardine crasso, lato, inaequaliter 

 tridentato, dentibus compressis, parum obliquis, antico valvae 

 dextrae brevissimo, postico valvse sinistrse obsoleto ; dentes late- 

 rales valde inajquales, anticus crassus, brevis, transversus, cardine 

 coadunatus, posticus elongatus, tenuissime striatus, cardine remo- 

 tus ; muscvdorum cicatriculaj subrotundatse, a^quales ; pallii im- 

 pressio postice sinu brevissimo terminata ; ligamentum extemum, 

 breve, angustum, semicylindraceum. 



Cyrena (sp.), Gray, Ann. Phil. 1825, p. 137. 



Venus, Gray in Wood (1828), Ind. Test. Suppl. pl. 2. f. 14. 



Velorita, Gray (1834), Griff. Anim. Kingd. Moll. pl. 31. f. 5. 



(misprint Villorita) ; Syn. B. M. (1842) 75 ; Proc. Zool. Soc. 



1847, p. 184; Ann. ^ Mag.N. H. ser. 2. xi. 34. 

 Villarita, Dunker, 1846 (misprint). 

 Cyrenodontse, Johannis, Mag. Zool. 1836, t. 7^. 



1. Velorita cyprinoides. 



V. testa trigonali, altiori quam lata, cordiformi, valde insequila- 

 tcrali, crassa, tumida, solidissima, transversim regulariter sul- 

 cata, sulcis antice posticeque evanescentibus ; epidermide oli- 

 vaceo-fuscescente nitidissime vestita, latere antico latiore, late 

 semicirculari, })ostico brevissimo, recto, valde declivi, angulo 



