425 



19. Spondylus Cumingii (pi. lxxxix. f. 62.), nobis. 



S. testa regulari, subrotundata, subdepressa ; area, cardinal! 

 parva; costis principalibus 6, elevatis, laevibus; squamis subelon- 

 gatis, leevibus, arcuatis, palmatis, ad latera palmarum uudulatim 

 fimbriatis ; interstitiis imbricatim striatis ; colore fusco-rubescente. 



A free growing species, like S. regius and 8. imperialis, with a 

 short cardinal area, of an uniform purplish-brown tint, with six 

 principal ribs, ornamented by arched palmated scales, the sides 

 and ends of which are frilled and fluted. The interstices are filled 

 with numerous imbricated ribs. In Mr. Cuming's collection. 

 From the Island of Java. 



20. Spondylus vakiegatus (pi. lxxxv. f. 14, 15.), Lam., 

 Anim. s. vert. vol. vi. f. 189. 



S. testa rotundato-ovali, auriculis subquadratis, costis 6 princi- 

 pabbus ; spinis obtusis, rectiusculis, distantibus ; interstitiis bi- 

 costatis, bisulcatis ; colore interstitiarum per lineis angulatis dispo- 

 sito, prope umbones maculato et variegato. 



The five or six principal ribs are characterized by straight, erect, 

 thick and blunt spines, the interstitial ribs and grooves seldom 

 present spines or imbrications. The colour is dark variegated 

 brown, and sharp angulated lines, upon a nearly white ground, 

 between the ribs. The pale pinkish variety represented by fig. 14, 

 is in the collection of M. Gruner; the typical specimen, fig. 15, is 

 from Amboyna. 



21. Spondylus Lamarckii (pi. lxxxv. f. 20. pi. lxxxix. 

 f. 63.), C/ie/m, Illust. conch, pi. 9. f. 4. p. 6. S. ducalis, var., Lam. 

 S. spathuliferus, Lam. (?) Chemnitz fig. 474, 475. 



S. testa, ovali depressa, lsevi, vel lseviter striata, purpureo vel 

 fusco variegata ; margine interiori purpureo ; cardine fusco ; costis 

 principalibus 6, squamis erectiusculis, tenuis, distantibus, compla- 

 natis, ltevibus ; variat squamis nulhs, irregulariter costata. 



Shell oval, rather depressed, smooth, or very slightly striated, 

 purple, variegated with white, with a strong band of dark purple 

 in the interior ; hinge dark brown ; six ribs, with distant, thin, 

 smooth, arched, palmated scales, which in some specimens are 

 obsolete. This species differs from S. ducalis (if really distinct) 

 in the absence of the well-defined grey stripes, and in the smooth- 

 ness of the interstices. We are informed that Lamarck considered 

 it as a variety of Chemnitz's S. ducalis, and Chenu has accordingly 

 figured it as such, in his plates ; but he has subsequently given to 



