SCINTILLA. 



Genus SCINTILLA, J)cs/,„i/,s. 



Moltuscum acepludum, l/iinusctilogtim. T<sta bivalcU, 



/(Bviyatd, transversim snboi'ata, margine dorsali sen 



ventrali /re(jueiiter hianti, canlo dentibus utruquc 



valv'i duobtts divergentibtis postico nonnunquam 



duplicato ; Ugamento parvo, lineari, intcrno. Im- 



pressio pal/ii integta. 



Mollusc acephalous, bimuscular, shell bivalve, smooth, 



transversely subovate, dorsal or ventral margin 



frequently gaping; hinge with two divergent teeth 



in each valve, the posterior sometimes divided ; 



ligament small, linear internal ; impression of the 



mantle entire. 



The shells of this genus difler from those of Galeomma, 



in having a smooth, sunictinies, polished surface. The 



mantle is reflected over the backs of the valves, as they 



lie open when living. Pew of the Scintilla gape 



widely as most of the Galeomma: do. The greater 



number of the hitherto recorded species are from the 



Philippines. Several are I'rom Australia, while Borneo, 



the Mauritius, and Ceylon add a few to the number. 



Species 1. (Mus. Brit.) 



Scintilla succinea. Sci. testd politd, subqimdrata, 



fused, semipellucidd, clausd, suhccquHalerali ; 



Tnargine ventrali vix convexo. 

 The AMiiEU Scintilla. Shell polished, subquadrate, 



brown, semipelliicid, closed, subcquilateral ; ventral 



margin scarcely convex. 

 DtsHATES. Proc. Zool. Soc, 1855, p. 176. 

 Hab. Isl. Luzon, Philippines. 



This rather square shell is closed all round. 



Species 2. (F 



Scintilla tuegescens. ; 

 oblongo-subquadvatd. 

 obtusis ; manjine ventrali 



. h, Mus. Brit.) 



testd, alba, injkitd, i-lansd, 

 bwquilaterali ; nmhonibus 



culo. 



The swelling Scintilla. Shell white, inflated, closed, 

 oblong-sub(]uadrate, snbequilateral ; umbones 

 obtuse ; ventral margin rather straight. 



Deshayes. Proc. Zool. Soc., 1855, p. 175. 



Ifah. Moreton Bay. 



Species 3. (Fig. a, b, Mus. Brit.) 



Scintilla Ci:mini;ii. Sci. testd atbd, parlim muiu- 

 tissiine granulatd, opacd, solidiitsculd, tumidd, 

 oblongo-suhquadratd, clausd, suhmquilatei'ali, latere 

 aiitico paulb miiiuri, subtriuicato ; margine ven- 

 trali inlus ininute cremilato. 



Cuming's Scintilla. Shell white, in parts very 

 minutely granulated, opaque, i-ather solid, tumid, 

 oblong-subquadrate, closed, subcquilateral, an- 

 terior side rather the smaller, slightly truncated ; 

 ventral margin minutely crenulated within. 



Deshaves. Proc. ZooL Soc, 1855, p. 173. 



Hab. Panama. 



Species 4.- (Fig. a, b, Mus. Brit.) 



Scintilla Reevii. Sci. testd cornpressd, latd, sub- 

 truncatd, semipellucidd, margine dorsali utrinqve 

 hianti ; postice declivi, antice elevato, terminibus 

 late truncatis. 



Reeve's Scintilla. Shell compressed, broad, sub- 

 truncated, semipellucid, dorsal margin gaping on 

 both sides, posteriorly sloped, anteriorly raised ; 

 ends broadly truncated. 



Deshayes. Proc. Zool. Soc, 1855, p. 17C. 



Hab. Isl. Negroes, Philippines. 



Species 5. (Fig. a, b. Mus. Brit.) 

 Scintilla Piiilippinensis. Sci. ovatd, albidd, com- 

 pressd, tdrinqii'e paulu hianti ; latere postico 

 breviori, obliqui: siibtruncatu : margine ventrali 

 ant ire conrexiiisculo. 



February, 1874. 



