420 



The interstices are smoothly and irregularly ribbed. The colour 

 is uniformly orange. 

 West Indies. 



6. Spondylus longitudinalis (pi. Ixxxvi. f. 23, 25, 

 pi. Ixxxix. f. 56.), Lam. Anim. s. vert. vol. vi. p. 191. S. multila- 

 mellatus. Lam. Chenu. Illust. couch. 



S. testa plerumque ovali, costata; costis principalibus 5 ad 8 

 creberrime imbricatis et aculeatis squamis erectiusculis numerosis 

 planulatis et truncatis ; colore vario plus minusve croceo. 



The specimens of tliis very variable species, of wliich fig. 25 

 may be considered typical, correspond fairly with the shells in 

 Lamarck's collection, as figured by Chenu in the ' Illust. conch.' 

 When in perfect condition, and fully developed, the ribs are nu- 

 merous, and sharply imbricated ; from five to eight of them are 

 closely studded with rather erect, flattened, smooth scales, slightly 

 hoUowed underneath. 



All the specimens are from the West Indies, excepting the last 

 mentioned, wliich is from Cliina. 



7. Spondylus digitatus (pi. Ixxxix. f. 58, 59.), noUs, Proc. 

 Zool. Soc, May, 1847. 



S. testa subrotundat^, tenui, costata ; costis 6 ad 8 principali- 

 bus, vix elevatis, squamis rectiusculis, arcuatis, ad terminos pal- 

 matis, aculeatim divisis, interstitiis spinosis; colore fusco, vel 

 rubro, vel purpureo, ad umbones rubro variegato. 



The shells here described may possibly be only young specimens 

 of S. longitudinalis, witli the scales developed in a remarkable man- 

 ner ; their peculiarity consists in the beautifully branched and digi- 

 tated palmations, wliich terminate the arched outstanding scales. 



Taken from ships' bottoms, at Bermudas. In H. Cuming's 

 collection. 



8. Spondylus lingua-felis (pi. Ixxxviii. f. 50,), Sow., Jun. 

 Proc. Zool. Soc, May, 1847. 



S. testa ovali, crassa, fusca, subtus crocea ; area cardinali et auri- 

 culis magnis ; costis numerosis vix elevatis, spinis brevibus, sequa- 

 libus, numerosis, armatis. 



A much more solid shell than S. asperrimus, with large hinge, 

 and of an uniform dark brown colour, which is shown in the in- 

 terior by a strongly marked brown border. The shell is covered 

 by nearly equal ribs, which are armed by short thick numerous 



