PECTEN. 



Plate XXV. 



Species 99. (Mus. Cuming.) 



Pecten ckistul.^ris. Pect. testa, orbiculari, compressius- 

 cula, sulaquilaterali, aquivalni, valvis cosds quinqiie 

 et viginti, plano-couvexis, anticis nMricato-squamom, 

 radiatis ; alhidd, intense carnco-rufo maculatd et tenu- 

 issime concentrice lineatd; aui'iculis intsqualibiis, sqna- 

 mis prominentihus cristatis. 



The crested Pecten. Shell orbicular, rather com- 

 pressed, nearly equilateral, equivalve, valves rayed 

 with five-and-twenty flatly convex ribs, of which the 

 anterior are prickly-scaled ; whitish, blotched and 

 very finely concentrically lineated with very dark 

 flesh-red ; ears unequal, crested with prominent scales. 



Adams and Reeve, Zool. Voy. Samarang, MoUusca, p. 74. 

 pi. 21. f. 15. 



Hab. Eastern Seas. 



Of a peculiar dark flesh-red or blood-brown colouring, 

 gently prickly-scaled on the anterior side, and prominently 

 scaled at the upper edge of the anterior ear. 



Species 100. (Mus. Cuming.) 



Pecten mollitus. Pect. testa suborbiculari, paululum 

 altiore quam longd, compressd, tenia, semipellucidd, 

 cequilaterali, cequivalvi, radiatim mtdique dense subtilis- 

 sime serrato-siriatd ; albidd aut Itttescente, pellucido- 

 roseo concentrice tmctd,punctis numerosis fuscescentibiis 

 aspersd ; auriculis peculiariter bueqitalibus. 



The delicate Pecten. Shell nearly orbicular, a little 

 higher than long, compressed, thin, semitransparent, 

 equilateral, equivalve, radiately densely very finely 

 serrately striated throughout ; whitish or yellowish, 

 concentrically stained with transparent rose, and 

 sprinkled throughout with light brownish dots ; ears 

 peculiarly unequal. 



Hab. Japan. 



This, as will be seen by the above description, is an 

 extremely characteristic species ; delicate in its substance, 

 sculpture, and colouring, and quite distinct from any 

 hitherto known. 



Species 101. (Mus. Cuming.) 



Pecten miles. Pect. testa orbiculari, eeqiiilaterali, aqui- 

 valvi, valvis rude et irregulariter decemcostatis, costis 

 alternatim majoribus, costis interstltiisque nndique te- 

 nuiliratis ; intiis extusque miniaceo-riifd, imniaculatd ; 

 auriculis aqualibus. 



The soldier Pecten. Shell orbicular, equilateral, equi- 



valve, valves rudely and irregularly ten-ribbed, ribs 

 alternately larger, ribs and interstices finely ridged 

 throughout ; vermilion-red witliin and without, un- 

 spotted; ears equal. 

 Hab. Java. 



Conspicuously ribbed, but the ribs are developed with 

 great ii'regularity ; now broad or narrow, now single or 

 duplicate. 



Species 103. (Fig. a, b, Mus. Cuming.) 



Pecten varius. Pect. testa ovatd, altiore quam longd, 

 mqidlaterali, subaquivaloi, valvis costis triginta ad 

 quinque et triginta acuti radiatis, costis plus minus 

 squamatis, squamis subdistantibus, interdum promiscue 

 porrectis ; colore vario ; auriculis valde inaqualihus, 

 squamatis. 



The many-coloured Pecten. Shell ovate, higher 

 than long, equilateral, nearly equivalve, valves sharply 

 rayed with thirty to five-and-thirty ribs, ribs narrow, 

 more or less squamate, scales rather distant, some- 

 times promiscuously stretched out ; colour various ; 

 ears very unequal, squamate. 



Ostrea varia, Liunseus, Syst. Nat. (13th edit.) p. 1146. 

 Varieties — Ostrea rnuricata, punctata, ockroleuca, laus- 

 telina.jlammea, incarnata, and versicolor, Gmelin. 



Hab. Seas of Em'ope. 



Extremely variable in colour, and also in the number 

 of ribs, but always distinguished by a constant peculi- 

 arity of form and sculpture. 



Species 103. (Fig. a, b, Mus. Cuming.) 



Pecten Austkalis. Pect. testa orbicidari, interdum 

 subventricosd, vix cequilaterali, aquivalvi, valvis costis 

 quatuor et viginti radiatis, costis peculiariter trifariam 

 divisis et dense tenuiserratis ; nigricante-violaced vel 

 aurantio-rosed, itnmaculatd; auriculis incequalibus. 



The Australian Pecten. Shell orbicular, sometimes 

 rather ventricose, scarcely equilateral, equivalve, 

 valves rayed vrith four-and-twenty ribs, whicli are 

 pecuLiai-ly three-divided and densely finely serrated ; 

 blackish-violet or orange-rose, unspotted ; ears un- 

 equal. 



SowERBY, Thesaurus Conch, vol. i. p. 76. pi. 19. f. 210 

 and 320. 



Hab. Mouth of the Swan River, Australia. 



The tripartite division of the ribs is a very striking 

 peculiarity in this species. 



May, 1853. 



