PECTEN.— Plate III. 



left valve rounded, raised, slanting down near the 

 margin of the right valve, broader, convex, less 

 raised ; left valve fulvous-white, broadly marbled with 

 chestnut-red, right valve white, unspotted. 



Ostrea plica, Linnfeus, Syst. Nat. p. 1145, 

 Pecten plica, Lamarck. 



Hab. China, Ceylon. 



Curiously distinguished by a kind of supplementary 

 growth next the margin, in which the ribs are almost 

 obsolete. 



Species 17. (Fig. a, h, Mus. Cuming.) 



Pbcten subplicatus. Pect. testa subtrigono-ovatd, sub- 

 aquivalm, aguilaterali, compressd, lateribus versus um- 

 bones subcompressis, auriculls aqualibus; valvis un- 

 dique striatis, costis tribus out quinque radiatis, costis 

 mbelevatis, prope marginem declivibus, valvce dextrce 



latioribus ; valvd sinistra albo castaneoque variegatd, 

 versus mnbones violascentibus, dextrd alba, castaneo 

 interdum pallide tinctd. 



The subplicate Pecten. SheU somewhat triangularly 

 ovate, nearly equivalve, equilateral, compressed, sides 

 a little compressed towards the umboes, ears equal ; 

 valves striated thi'oughout, rayed with tliree to five 

 ribs, ribs somewhat raised, slanting near the margin, 

 of the right valve broader ; left valve variegated with 

 white and chestnut, violet towards the umboes, right 

 valve white, sometimes faintly tinged with chestnut. 



SowEEBY, Thesaurus Conch, vol. i. p. 64. pi. 13. f. 37, 

 and pi. 14. f. 72, 73, 81. 



Hab. Island of Corrigidor, Bay of Manila (in coarse sand 

 at the depth of seven fathoms) ; Cuming. 



This appears to be little more than a variety of the pre- 

 ceding species, thinner and more compressed. The detail 

 of character is the same throughout. 



