JOURNAL OF CONCHOLOGY. 279 



DESCRIPTIONS OF SIX NEW SPECIES OF PECTEN. 



By IAMES COSMO MELVILL, M.A., F.L.S. 



Pecten Gladysiae nov. sp. PI. ii, fig. 5. 



P. testa ovata, pert en ui, planiusculd, straniinea, albis flocculis 

 nubeculata, valvis sitbcEqualibus, costis lirisque niivierosisshnis, 

 fere triginta, sublcEvibus, auricuHs inceqimlibus, flexuosis. 

 Long. 28 mill.^ lat., 24 mill. 



Habitat ? 



A very striking form, and not very nearly allied to any 

 species with which I am acquainted. The thin, flattened valves, 

 of a bright straw colour, are clouded here and there with flaky- 

 white markings, the ribs and ridges are extremely numerous, 

 about thirty altogether in either valve. 



Pecten Guendolense nov. sp. PI. ii, fig. 6. 



F. teata globosa, perconvexd, subcequilaterali, valvis duo et viginti 

 costis radiatis, triliratis ut in P. coruscante, interstitiis scab- 

 7'osulis, valvd sinistrd roseo-brunned et prtmo-maculatd, 

 dextd pallidiose, auriculis incequalibus, intus coloratd. 



Long. 15 7nill., lat. 15 mill. 



Hab. : Mauritius. 



A subglobose little species, brightly coloured with white, 

 rose, and plum-colour arranged in blotches. Very like a small 

 P. nucleus, until its sculpture and structure be examined. The 

 only shell with which this can be compared is P. coruscans 

 (Hinds), described in Moll. Voy. Sulphur, p. 61, pi. 17, f. 3. 

 From that species this would seem to differ in its decidedly more 

 squarrose form, its having twenty-two, as against twenty, ribs, the 

 more lively coloration, and the difference in locality. P. corus- 

 cans being from the Marquesas Islands. 



Pecten Hastingsii nov. sp. PL ii, fig. 7. 



P. testd globosd, subcequilaterali, ijicequivalvi, valvd dextrd majore, 

 dextro umbone altiore qudm sifiisttd, costis octodeci?n pulchre 

 sculpturatis , biliratis, told superficie utrimque undato-scam- 



