40 BIVALVE SHELLS. 



Cytherea Philippinarum, Hanley, Proc. Zool. Soc. (1844) 110. 

 Wood, Index Test. Sup. pl. 19. f. 36. 

 Sow. Thes. Conch. p. 627. pl. 136. f. 1/6. 



Hab. Insulse Philippinse {Cuming). 



15. Meretrix lyrata. 



M. testa ovali-subtrigona, crassa, ventricosa, falvo-cinerascente, 

 concentrice subundatim sulcata; latere postico subangulato, 

 fusco ; lunula vix distincta. 



Meretrix lyrata, Sow. Thes. Conch. p. 621. pl. 129. f. 61. 



Hah. Insulse Philippinse. 



16. Meretrix exilis. B.M. 



M. testa trigona, corapressa, sequilaterali, Isevigata, flava vel fusca, 

 aliquantisper albo radiata, postice subangulata; umbonibus 

 parvis ; lunula magna, prominente, linea impressa circumdata ; 

 cardine angusto, dente lunari magno, compresso ; sinu pallii lato, 

 excavato. 



Cytherea Mitis, Gray, Cat. Cyth. Anal. t. viii. p. 303. 



Hah. ? 



17. Meretrix formosa. B.M. 



M. testa M. meretrici simili, sed magis obliquaet elongata, latere 

 postico elongatiusculo ; colore pallido, fasciis griseis suffuso, 

 prope umbones biradiato ; intiis candidissima ; sinu pallii lato, 

 magis quam in aliis speciebus, profundiore ; nymphae basis rai- 

 nutissime granulosa; lunula ovato-lanceolata, elongata, linea 

 impressa circumdata. 



Meretrix formosa, Sow.jun. Thes. Conch. p. 620. pl. 129. f. 4/. 



Hab. ? 



18. Meretrix grata. 



M. testa minima, ovato-trigona, depressiuscula, ingequilaterali, 

 nitidissima, late profundeque transversim sulcata ; sulcis regu- 

 laribus, rotundatis, interstitiis subsequalibus separatis, simpli- 

 cibus, rubescentibus, interstitiis pallide luteis; umbonibus 

 acutis, parvis, angustis, elatis; lunula plana, ovato-angusta, 

 elongata, livida ; area planulata, Isevigata ; valvis intus albis, 

 macula angusta castanea in margine postico ; sinu palUi latis- 

 simo, seraicirculari. 



Meretrix grata, Desh. Proc. Zool. Soc. 1853. 

 Hah. Mare Chinense. Coll. Cuming. 



