240 BIVALVE SHELLS. 



elongato, clentibus obliquis ; ilcnte lateral! antico cardine 

 l)rn.\iino irregulariter sulcato, posticali angusto cardine remo- 

 tissimo. 



Ratissa megadesma, Desk. Proc. Zool. Soc. 1844. 

 Hub. ? 



16. Batlssa atrata. 



B. testa orbicular!, sublenticulari, jequilaterali, transversim obso- 

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

 bus brevibus minimis, oppositis, approximatis, apice decorti- 

 catis ; valvis temiibus ; cardine angusto, ina^qualiter tridentato ; 

 dente antico in iitraque vaha angusto ; dentiljus lateralibus 

 brcvioribus, angustis, oblique sulcato-rugosis ; impressione 

 l)allii postice leviter inflexa. 



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



Hab. ? 



Genus 3. VELORITA. 



Animal ignotum. 



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

 tita, postice tiimcata, angulata ; cardine crasso, lato, iufcqualiter 

 tridentato, dentibus compressis, parum obliquis, antico valvae 

 dextrae brevissimo, postico valvse sinisti-ae obsolete ; dentes late- 

 rales valde inaequales. anticus crassus, bre^^s, transversus, cai'dine 

 coadunatus, posticus elongatus, tenuissime striatus, cardine remo- 

 tus ; musculorum cicatricidse subrotundatre, a^quales ; pallii im- 

 pressio postice sinu brevissimo temiinata ; ligamcntum externum, 

 breve, angustum, semicylindraceum. 



Cyrena (sp.), Gray, Ann. Phil. 1825, p. 1.37. 



Venus, Grai/ in Wood (1828), Ind. Test. Suppl. pi. 2. f. 14. 



Velorita, Groy (1834), Griff. Anim. Kingd. Moll. pi. 31. f. 5. 



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



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

 Villarita, Dunker, 1846 (misprint). 

 Cyrenodontse, Johannis, Mag. Zool. 1836, t. /O. 



1. Velorita cyprinoides. 



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

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

 cata, sulcis antice posticeque evanescentibus ; epidermide oli- 

 vaceo-Fuscescente nitidissime vestita, latere antico latiore, late 

 semicirculari, postico brevissimo, recto, valde declivi, angulo 



