No. 4. — Descriptiun of a new species of Corbicula, with Notes on 

 other Species of the Corbiculadse Family. By Temple Prime. 



Corbicula Moltkiana, nov. spec. 

 FL II. Fig. 2, a, h, c. 



C. testa loevis, transversa, compressa, subfequilaterali ; latere antico 

 breviore, rotundato, postico obtuso ; umbonibus brevibus, obtusis ; 

 bmula vix conspicua ; epiderniide nigro-fuscesceute, nitente vestita ; 

 striis elevatis, regularibus ; margarita violacea. 



Long. 25; lat. 20; diam. 12 mill. 



Hab. Sumatra. 



Collect. University of Copenhagen (two specimens). 



Compai'ed with Corh. ducalis, from Java, it is less heavy, less inflated, 

 transversely less rounded, and the striaj 

 are less distant. 



I know of but one other species of Cor- 

 bicula from Sumatra, the puUata, of Phi- 

 lippi, which, judging from the description, 

 must be more spherical and more trigonal 



than my species. Corbicula ducalis. 



Count Moltke, of Denmark, to whose memory I dedicate this species, 

 was the possessor of one of the finest collections of his day, which, at his 

 death, towards the end of the last century, he left to the University of 

 Copenhagen. 



Cyrena pullastra, Morch. 



FL II. Fig. 3, a, b, c. 



Grena (Polymesoda) pullastra, Morch. Malak Bliitt. VII. 194, 1860. Smith. 

 Inst. Prime, Men. Cork 26, 1865. 



C. testa ovalis, tenuis, albescens, radiatim subtilissime sti-iata, valde 

 injequilateralis, convexiuscula, antice brevissime angustata, postice late 

 rotundata, margo dorsalis anticus precipite declivis, posticus rectus fere 

 horizontalis, postice angulo obtuso ; margo vcntralis parum arcuatus ; 

 area postice violacea tincta ; dens lateralis posticus valvar sinistrse re- 

 motissimus, comprcssus inter laminas 2 valvio dextnc rocojjtus ; dens 

 anticus subapproximatus ; sinus syphonalis angustissinuis, sursum 

 sijectans. 



