PECTEN. 



Plate II. 



Species 7. (T'ig. 7 and 8. a, h, Mus. Cuming.) 



Pecten exasperatus. Peel, testa mhcequivalvi, amiculis 

 graiidibus, conspicue scabrosis, sinistris supeme acide 

 squamatis ; valvd sinistra, convexd, costis octodecim pro- 

 fuse serrato-scabrosis radiatd, interstiliis scabrosis, f/d- 

 va, olivaceo maculatd, niveo-albo aperaa, costis quinque 

 alhicantioribus, sqnamis ceidralibiis majoribus ; valvd 

 dextrd subplaniore, costis septemdecim, profuse serra- 

 to-squamatis, omnibus similibus, pallidiore, olivaceo 

 niveoque a^persd, lateribus acute squamatis. 



The sharpened Pecten. Shell nearly equivalve, ears 

 large, conspicuously scabrous, left ears sharply scaled 

 along the tip ; left valve convex, rayed witii eighteen 

 profusely serrately scabrous ribs, interstices scabrous, 

 fulvous, spotted with oUve and sprinkled with snowy 

 white, five of the ribs whiter, with the central scales 

 lai'ger; right valve rather flatter, with seventeen 

 profusely serrately scabrous ribs, all alike, paler, 

 sprinkled with olive and snowy white, sides sharply 

 scaled. 



SowERBY, Thesaurus Conch, vol. i. p. 54. pi. 18. f. 183- 

 186. 



Ifab. Island of St. John, West Indies. 



Mr. Sowerby has erred in quoting the Mediterranean as 

 the habitat of this very characteristic species. 



Species 9. (Mus. Cuming.) 



Pecten magnificus. Pect. testd subaquivalvi, aqidla- 

 terali, auricuUs inaqualibus, radiatim liratd, liris au- 

 ricularum auticarum faucioribus et majoribus ; valvis 

 costis tredecim ad quatuordecim, rotundatis, obsolete 

 nodosis, radiatis, costis interstitiisque longitudinaliter 

 sulcosis, sulcis traHsversim minutissime arcuatim stri- 

 atis ; extus intense coralUo-rubrd, intus alia, purpureo- 

 marginatd. 



The magnificent Pecten. Shell nearly equivalve, equi- 

 lateral, ears unequal, radiately ridged, ridges of the 

 front ears fewer and larger ; valves rayed with thir- 

 teen to fourteen rounded, obsoletely nodose ridges, 

 ribs and interstices longitudinally grooved, grooves 

 transversely very minutely arcuately striated ; deep 

 coral-red without, white and purple-edged within. 



Sowerby, Pro. Zool. Soc. 1835, p. 109. 



Xovember 



Hah. Isle of Plata, West Columbia (in coral sand at a 

 depth of from six to seventeen fathoms) ; Cuming. 



This fine species is not very remotely allied to P. coral- 

 linoides, although of so very much larger size. 



Species 10. (Mus. Cuming.) 



1'ecten asper. Pect. testd inaquivalvi, cequilaterali, au- 

 ricuUs (gqualibus, minute serrato-striatis ; valvd sinis- 

 trd pland, umbones versus patdulnm elevatd, costis oc- 

 todecim subplano-biangidatis radiatd, costis intersti- 

 tiisque concentrice striatis, pallide rufescente ubique 

 punctulatd ; valvd dextrd convexd, costis novemdecim 

 sublcBvigatis radiatd, costis albis, rufescente sparsim 

 liueatis, interstitiis margineni versus rufescentibus. 



The rough Pecten. Shell inequivalve, equilateral, ears 

 equal, minutely serrately striated ; left valve flat, a 

 little raised towards the umboes, rayed with eighteen 

 rather flatly two-angled ribs, ribs and interstices con- 

 centrically striated, dotted everywhere with pale red ; 

 right valve convex, rayed with nineteen rather smooth 

 ribs, ribs white, sparingly lineated with red, inter- 

 stices red towards the margin. 



Sowerby, Thesaurus Conch, vol. i. p. 50. 

 Pecten tricarinatus ? Anton. 



Hab. New Guinea ; Hinds. 



It is a peculiarity in this species, that there is less co- 

 lourina; on the ribs than in the interstices. 



Species 11. (Mus. Cuming.) 



Pecten stellatus. Pect. testd subceqtdvalvi, tenuiculd, 

 subcompressd, paululum altiore quam longd, auri- 

 culis parviusculis, subaqualibus ; valvd sinistrd costis 

 sex-radiatd, Interstitiisque longitudinaliter liratis et 

 tenuistriatis, rufescente, punctii angulatis albis aspersd ; 

 valvd dextrd costis latioribus subrudibus septem-radiatd, 

 costis interstitiisque liratis, alba, timbonem versus albi- 

 punctalo-rufescente. 



The starry Pecten. Shell nearly equivalve, rather 

 thin and compressed, a little higher than long, ears 

 rather small, nearly equal ; left valve rayed with six 

 ribs, ribs and interstices longitudinally ridged and 

 finely striated, light red, sprinkled with white angular 



1853. 



