COBBULA. Panama Shells. 299 



odd valves, of a clear phik color, were picked up ; 

 Cuming 1 Sowerby : also Eeeve. 

 S. America ; Hanley. 

 Taboga ; C. B. A. I 

 6 odd valves and 1 entire specimen were found. The latter 

 is of extraordinary size and thickness. Its dimensions are — 

 length 1.22 inch ; height .81 inch ; width .68 inch : it weighs 

 I oz. On and around the umbones, it is of a clear pink color. 



506. Corbiila rubra. Nov. sp. 



Shell subovate, moderately inequivalve and inequilateral, 

 posteriorly acuminate, with the ventral margin arcuate, anteriorly 

 rounded : rufous, with a short white ray on the anterior side of 

 the umbo, and a dark red spot before it : with fine concentric 

 striae, decussated by radiating microscopic striae : beaks not very 

 prominent : umbonea prominent, somewhat angulated on both 

 sides near the beaks : teeth small. Our unique specimen has a 

 broad flexure a little behind the middle : but this may be an 

 accidental growth. 



Length .31 inch ; height .19 inch ; breadth .14 inch. 



Station. — Unknown. 

 Habitat. — ^Panama ; 0. B. A. I 

 Only 1 specimen was obtained. 



507. Corbula tenuis. Nov. sp. 



Synonymy. 



Corhula tenuis Sowb. in Proc. Zoo!. Soc. Lond. p. 36. Mar. 1836. 



Miill. Syn. Test. Viv. p. 231. May 1836. 



Reeve Conch. Icon. pi. 2. f. 13. Sept. 1843. 



Station. — Sandy mud, at the depth of 12 fathoms ; Cuming I 



Sowerby : also Reeve. 



Eabitat. — Bay of Montijo ; Cuming I Sowerby : also Miiller : 



also Reeve. 



Mazatlan ; E. Jewett I Gould MSS. 



Panama ; C, B. A. I 



