PECTEN 



Plate IV. 



Species 18. (Mus. Cuming.) 



Pecten clavatus. Pact, testa trigono-orbiculari, ina- 

 guivalvi, aquilaierali, auriculis parvis, huequalihis ; 

 valvis temdbiis, minute granuloso-striatis, sinistra con- 

 cavo-depressd, costis quinque tumidiusculis subacittis 

 radiatd, prope marginem hiflatis, aurantio-rufescente, 

 pmwtis pallidis dense leniigiiiosd; valvd dextrdconvexd, 

 costis quinque latioribus injiatis, albd. 



The sttjdded Pecten. Shell triangularly orbicular, 

 inequivalve, equilateral, ears small, unequal ; valves 

 tliin, minutely grauulately striated ; left valve con- 

 cavely depressed, rayed with five rather sharp swol- 

 len ribs, inflated near the margin, orange-red, densely 

 freckled with light dots ; right valve convex, with five 

 broader inflated ribs, white. 



PoLi, Test. utr. Sicil. pi. 1. f. 17. 

 Eadem var., Pecten inflexus, Poli. 

 Pecten Dmnasii, Payraudeau. 



Hab. Sicily. 



Very closely allied to P. Danicus, and probably only a 

 variety of that species. 



Species 19. (Fig. a, b, Mus. Cuming.) 



Pecten irregulakis. Pect. testa oblique ovatd, tenui- 

 culd, subfequivalvi ; valvd dextrd convexiore, subirregu- 

 lari, auriculis valde inaqualibus, posticis parvis, bre- 

 vibus ; valvis costis parvis tmmerosis, vix scabrosis, ra- 

 diatis ; colore varid, nunc vivide miniaced, nunc pur- 

 pureo-violaced, albo maculatd et obscure radiatd, albo 

 interdwn fusco-punctato. 



The irregular Pecten. Shell obliquely ovate, rather 

 thin, nearly equivalve ; right valve more convex, 

 rather in'cgular, ears veiy unequal, the posterior 

 smaU, short ; valves rayed with numerous small 

 slightly scabrous ribs ; colour various, now bright 

 vermilion, now purple-violet, blotched and obscurely 

 rayed with white, the white being sometimes dotted 

 with brown. 



SowERBY, Thesaurus Conch, p. 69. pi. 13. f. .51-2. 



Eab. Eastern Seas. 



An extremely interesting species, bearing some general 

 resemblance to P.pttsio. 



Species 20. (Mus. Cuming.) 



Pecten subnodosus. Pect. testa subcequivalvi, epquila- 

 teruli, auriculis inaqualibus ; valvis liris angustis mt- 

 merosissimis radiatis ; valvd sinistra costis decern hie 

 illic nodosis, dextrd costis undecim lavibus radiatd ; 

 purpureo-hrunned, rnfo tinctd, lineis albis brevihns im- 

 datis concentrice notatd. 



The subnodose Pecten. Shell nearly equivalve, equi- 

 lateral, ears unequal ; valves rayed with very nume- 

 rous naiTow ridges ; left valve rayed with ten ribs, 

 here and there nodose ; right valve with eleven ribs, 

 smooth ; purple-brown, tinged with red, concentri- 

 cally marked with waved white lines. 



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



Ilah. Mexico and West Columbia (in sandy mud and 

 coral sand, at a depth of from ten to seventeen fa- 

 thoms) ; Cuming. 



Most readily distinguished at first sight from P. nodosus 

 by its concentric white-waved marking. 



Species 21. (Fig. a, b, Mus. Cuming.) 



Pecten flabelloides. Pect.testd suborhiculari, ad la- 

 tera prope umbones compressd, aquivalvi, (eqnilaterali, 

 auriculis subcequalibus ; valvis medio convexis, versus 

 marginem compressis et fortiter radiatim tenuiliratis, 

 costis octo ad novein rotundatis subelevatis radiatis ; 

 albd aid lutescente, castaueo vel purpureo-nigro plus 

 minus marmoratd. 



The fan-like Pecten. Shell nearly orbicular, com- 

 pressed at the sides near the umboes, equivalve, equi- 

 lateral, ears nearly equal ; valves convex in the mid- 

 dle, compressed and strongly finely radiately ridged 

 towards the margin, rayed with eight to nine rather 

 elevated rounded ribs ; white or yellowish, more or 

 less marbled with chestnut and pui-ple-black. 



Sab. Moluccas. 



A strongly formed species of veiy regular and symme- 

 tric growth, compressed a little at the sides, after the man- 

 ner of P. plica, but, unlike that species, expanded flatly out 

 towards the margin into the shape of a fan. 



November, 1852. 



