PECTEN. 



Plate XXVIII. 



Species 116. (Mus. Cuming.) 



Pecten pictus. Pect. testa trigono-orbiculari, compresso- 

 convexd, aqidlaterali, siibeequivalvi, valvis costis tre- 

 decim radiutis, costis angulatis, ad latera et inlerstitiis 

 minute crenulatis, costarum partibus albis valves si- 

 nistra; irregulariter corrugato-crenatis ; alba, pimctato- 

 roseo late variegatd ; auriculis subaquaUbns. 



The painted Pecten. Shell triangularly orbicular, com- 

 pressly convex, equilateral, nearly equivalve, valves 

 rayed with thirteen ribs, which are angled and mi- 

 nutely crenulated at the sides and in the interstices, 

 white parts of the ribs of the left valve irregularly 

 wrinkle-crenated ; white, broadly variegated with 

 dotted rose ; ears nearly equal. 



SowERBY, Thesaui-us Conch, vol. i. p. 62. pi. 20. f. 233. 



Hab. Isle of Baicus, Philippines ; Cuming. 



It is a singular peculiarity in this shell, that the un- 

 coloured parts of the ribs of the left valve are irregularly 

 wrinkled-crenated, but not the coloured. 



Species 117. (Mus. Cuming.) 



Pecten Madeeporarum. Pect. testa oblique ovatd, al- 

 tiore quam longd, smbirregulari, inaquilaterali, incequi- 

 valvi, valvd sinistra plano-convexd, dextrd convexiore, 

 ambabus dense minute rude crenulato-striatis ; alba, 

 valvd sinistra nigro-fusco prope umbouem punctatd ; 

 umbonibus valde aqualibus. 



The Madrepore Pecten. Shell obliquely ovate, higher 

 than long, rather irregular, inequilateral, inequivalve, 

 left valve flatly convex, right valve more convex, both 

 valves densely minutely rudely crenulately striated; 

 white, left valve dotted near the umbo with black- 

 brown ; umboes very unequal. 



Pettt, Sowerby, Thesaunis Conch, vol.i. p. 68. pi. 14. f. 68. 



Hab. Java (in masses of madrepore). 



A light thin white shell, dotted with black on the left 

 valve towards the umboes. 



Species 118. (Mus. Cuming.) 



Pecten spinifeeus. Pect. testa trigono-orbiculari, com- 

 pressd, subeequilaterali, inaquivalvi, valvd sinistrd le- 

 viter couvexd, costis novem latis, rotundatis, pulcher- 

 rime squamatis radiatd, squaniis eximie foriiicatis et 

 Jimbriatis, costis extremis lateralibus angustis spinoso- 



May, 1853. 



squamatis, costarum inlerstitiis subtiliter liraiis, valvd 

 dextrd novem-costatd et liratd, squamk parvioribus plus 

 numerosis, minus Jinibriatis, costis extremis spinoso- 

 squamatis ; semipellucido-albd, roseo hie illic sparsim 

 tinctd ; auriculis valde inrnqualibus, valvce dextrce ad 

 marginem spinoso-squamatis. 



The spined Pecten. Shell triangularly orbicular, com- 

 pressed, nearly equilateral, inequivalve, left valve 

 slightly convex, rayed with nine broad, rounded, very 

 beautifully scaled ribs, scales delicately vaulted and 

 fi'inged, outer lateral ribs narrow, spinosely-scaled, 

 interstices between the ribs finely ridged, right valve 

 also nine-ribbed and ridged, mth the scales smaller, 

 more numerous, and less fringed, outer ribs spinosely 

 squamate; semitransparent-white, sparingly tinged 

 here and there with pink ; ears very unequal, ear of 

 the right valve spinosely scaled along the edge. 



Sowerby, Pro. Zool. Soc. 1835, p. 110. 

 Pecten pidcherrivins. Gray. 



Hab. Lord Hood's Island, Pacific Ocean (on the reefs in 

 coral sand) ; Cuming. 



This very beautiful species has very much the general 

 aspect of P. speciosus, described in the preceding Plate, 

 but, on examination, it will be found to differ in its detail 

 of sculpture throughout. 



Species 119. (Mus. Cuming.) 



Pecten arthriticus. Pect. testd trigono-orbiculari, aqui- 

 laterali, inaquivalvi, valvd sinistrd convexd, et irregu- 

 lariter rude tumulosd, valvd dextrd minus convexd, plus 

 regnlari, ambabus decemcostatis, costis hie illic nodatis, 

 undique tenuiliratis, lirarum inlerstitiis subtiliter cre- 

 mdatis ; purpureo-grised, prope umbonem alba ; auri- 

 culis valde ina>qualibus. 



The gouty Pecten. Shell triangularly orbicular, equi- 

 lateral, inequivalve, left valve convex and irregulariy 

 rudely tumulous, right valve less convex and more 

 regular, both valves ten-ribbed, ribs here and there 

 noduled, finely ridged throughout, interstices between 

 the ridges finely crenulated ; purple-grey, white near 

 the umboes ; ears very imequal. 



Hab. ? 



Of singularly rude growth, though distinguished by a 

 characteristic plan of sculpture. 



