240 New Species of Corbula from Jamaica. 



sively prominent posterior angle, behind which is a large concave 

 area : teeth prominent, not robust. 



Length .45 inch ; height .35 inch ; breadth .28 inch. 



/Station. — Unknown. 



Habitat. — Unknown; Hinds: also Eeeve. St. Thomas; T. 

 Bland ! in sched. in Mus. Amh. We have only 5 odd valves ; 

 the relative size of the valves is therefore doubtful. 



Synonymy. — C. quadrata Hinds, in Proc. Zool. Soc. Lond. 



p. 67.- - - - May 1843. 

 Reeve Conch. Icon. pi. 5, f. 40. May 1844. 



After the brief descriptions by Mr. Hinds and Mr. Reeve, 

 additional description may not be wholly useless. The figure 

 given by Mr. Reeve exactly represents our specimens even to 

 the irregularity of the umbonial angle, which appears as if actu- 

 ally distorted by the compression of the upper part of the umbo. 



Corbula JSTewtoniana. — C. t. obovata-rhombica, tenui, (ine- 

 quivalvi?) perinequilaterali, antic^ brevissima, antic^ et postic^ 

 excurvata; margine ventrali recta: alba: concentric^ irregu- 

 lariter et exile striata: apicibus parvis, haud multum editis, 

 baud involutis: umbonibus subangulatis ; dentibus gracilibus. 

 Long. 12"'.7 ; alt. 8"'.6 ; lat. 7"'.9. 



Shell between an obovate and rhombic form, thin, (inequi- 

 valve ?) very inequilateral, the anterior part being very short, 

 anteriorl}'- and posteriorly well rounded; ventral margin straight: 

 white: with fine irregular striee of gTowth: beaks small but 

 somewhat prominent, acute, not involute: umbones with an 

 obtuse angle extending diagonally through the posterior half of 

 the disk ; teeth prominent, not robust. 



Length .'5 inch ; height .34 inch ; breadth .31 inch. 



Station. — Unknown. 



Habitat. — St. Thomas; T. Bland! in sched. in Mus. Amh. 

 We have only 4 specimens of the left valve. 



Corbula fulva. — C. t. ovato-triangulari, crassa, (inequi- 



