422 



regarded as typical. Fig. 26 is a fine shell, with yellow scales, in 

 the collection of Mr, Norris, and Fig. 24 is from a specimen in which 

 the scales seem to be accidentally aculeated. 



This species is given on the authority of those who have seen 

 the specimens in Lamarck's collection, and that of the museum at 

 Paris, although Lamarck refers to figures in Chemnitz repre- 

 senting another shell, which Chenu calls S. Lamarchn. 



Prom the West Indies. 



12. Spondylus microlepos (pi. 88. f. 46.), Lam., Anim. s. 

 vert. vol. vi. p. 192. 



S. "testa utrinque rubra, longitudinaUter costata et striata; 

 costis 5 ad 6 squamiferis, squamis ligulatis truncatis exiguis.^' 



We are favoured with the shell from China, represented, fig. 46, 

 by Mr. Hanley, and tliink it may probably be the species to which 

 Lamarck refers. The five or six principal ribs are notched by im- 

 bricated rudimentary scales, which near the margin present the 

 narrow Ugulate character above described. The intermediate ribs 

 numerous and minutely imbricated. There is a yellow shell in 

 Mr. Cuming's collection, presenting similar characteristics, and 

 agreeing equally well at the same time, with the fig. in ' Knorr ', 

 part 6. pi. 13. f. 3. referred to it by Lamarck. The shell described 

 by Lamarck is red. 



13. Spondylus pictoeum (pi. Ixxxvi. f. 28. pi. Ixxxv. f. 17. 

 pi. Ixxxviii. f. 45.), Chemn. Tab. 69. Ht. E. F. Spondylus crassi- 

 squama. Lam. Anim. s. vert. vol. vi. p. 191. S. princeps, Brod. 

 Proc. Zool. Soc, 1833, p. 4. S. dubius, Brod. Proc. Zool. Soc. 

 1833, p. 4. 



S. testa ponderosa, subrotundat^ ; cardine magno ; limbo pro- 

 funde plicato ; costis principalibus 6, validis ; squamis crassis, dis- 

 tantibus sub-depressis, ad terminos subcomplanatis, pauliilum 

 sulcatis ; costis interstitialibus 3 ad 6, spinis crassis brevibus, vel 

 squamis extantibus, sub-palmatis, insequalibus ; colore externe et 

 ad marginem interne, rubro ; variat purpureo, squamis aurantiis. 



A ponderous shell, of a deep red or orange-colour, with large 

 hinge and six principal ribs, with thick scales ; when young, it has 

 tliree interstitial ribs, wliich increase in number with the growth, 

 so that in the full-grown sheU there are seven between each of the 

 principal ribs. The intermediate scales are few at an early growth, 

 but increase in frequency, and they are more aculeate than the 

 others. Mr. Cuming posesses a very young shell, in which the 

 earliest scales are beautifully vaulted. S. d^'Mtis, Brod., is a variety 



