423 



ill wliich the interstices are more distinctly striated tlian in those 

 which Mr. Broderip has named S.princeps. By the rule of pri- 

 ority, both names, together with Lamarck's S. crassisqnama, 

 given on the authority of specimens so named in Lamarck's col- 

 lection, must give place to that which we have adopted, on an 

 examination of the figures in Chemnitz. ]\Ir. Ciuning's speci- 

 mens are from the Isle of Plata, West Columbia, and from the 

 GuK of Tehuan. Mr. Sowerby posesscs a small shell, which ap- 

 pears to be a variety of this, but wliich may be distinct, from China. 



14. Spondylus leucacantha (pi, Ixxxvii. f. 35, 36.), Brod. 

 Proc. Zool. Soc, 1833, p. 5. 



S. testa sohda, ventricosa, ovah ; costis 6 principalibus, squamis 

 elongatis subarcuatis, Ifevibus, angustis, subtus concavis, ad ter- 

 minum subtruncatis ; intcrstitiis minutissime imbricatim striatis, 

 costis vix elevatis, tribus (media maxima) aculeatis, regularibus, 

 subarcuatis, ornatis ; colore croceo vel rubro ; squamis albis. 



This elegant species is named from the beautifully wliite scales 

 standing out from an uniform ground of bright orange or scarlet. 

 The shell is solid, with six principal ribs, armed with strong, even, 

 and rather lengthened scales, wliich are slightly flattened and de- 

 pressed, but not spread at the ends. Between each rib there are 

 three rows of scales, some of wliich are pointed at the ends. 



Collected by Mr. Cuming at the Island of Plata. 



15. Spondylus UNicoLOE (pi. Ixxxv. f. 19.), Sowerby, Proc. 

 Zool. Soc. May, 1847. 



S. testa solida, oblique ovali, rubro violascente ; costis 6 prin- 

 cipalibus, squamis crassis, arcuatis, subtiis concavis, paululiim 

 palmatis, prope marginem numerosis ; costis interstitialibus, spinis 

 crassis, brevibus, armatis ; inter costas sulcis nonnullis. 



Solid, obliquely oval, of an uniform purplish-red colour, wliich 

 is shown in the interior by a strongly defined, deep red margin 

 round a wliite centre. The five or six most prominent ribs are 

 ornamented by strong, arched, hoUow spathulse, which are slightly 

 depressed and palmated at the end. The intermediate ribs are 

 studded with short thick spines near tne margin. Between some 

 of the ribs there is occasionally a deep groove ; in the thickness 

 and arrangement of the scales and ribs, and in the solidity of the 

 shell, it resembles S. pictorvm, from which it difiers principally in 

 the more tumid and obliquely oval form of the fully developed 

 specimens. After figuring M. Gruner's specimen, we have met 



