No. 4.— Description of a new species of Corbicula, with Notes on 
other Species of the Corbiculade Family. By TEMPLE PRIME. 
Corbicula Moltkiana, nov. spec. 
Ple dds Big, R, Gy Oy 0. 
C. testa levis, transversa, compressa, subsequilaterali; latere antico 
breviore, rotundato, postico obtuso; umbonibus brevibus, obtusis; 
lunula vix conspieua; epidermide nigro-fuscescente, nitente vestita; 
striis elevatis, regularibus; margarita violacea. 
Long. 25; lat. 20; diam. 12 mill. 
Has. Sumatra. 
ConnEOT. University of Copenhagen (two specimens). 
Compared with Corb, ducalis, from Java, it is less heavy, less inflated, 
transversely less rounded, and the stris 
are less distant. 
I know of but one other species of Cor- 
bicula from Sumatra, the pullata, 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, Móncn. 
Pl. II. Fig. 8, a, b, c. 
Grena (Polymesoda) pullastra, Mórch. Malak Blatt. VII. 194, 1860. Smith. 
Inst. Prime, Mon. Corb, 26, 1865. 
C. testa ovalis, tenuis, albescens, radiatim subtilissime striata, valde 
ineequilateralis, convexiuscula, antice brevissime angustata, postice late 
rotundata, margo dorsalis anticus precipite declivis, posticus rectus fere 
horizontalis, postice angulo obtuso; margo ventralis parum arcuatus ; 
area postice violacea tincta; dens lateralis posticus valve sinistre re- 
motissimus, compressus inter laminas 2 valve dextre receptus; dens 
anticus subapproximatus; sinus syphonalis angustissimus, sursum 
spectans. 
