IQI5 | H. B. Preston: Mollusca from near Calcutta. 481 
Class LAMELLIBRANCHIATA. 
Order TETRABRANCHIA. 
Suborder MYTILACEA. 
Family MyTILIDAE. 
Brachydontes emarginata (Reeve). 
Con. Icon., Modiola, 1858, sp. 60, pl. x, fig. 73. 
Canal near Chingrighatta, outskirts of Calcutta. 
Suborder CONCHACEA. 
Family VENERIDAE. 
Sinodia jukes-browniana, sp. n. 
Shell irregularly trigonal, inflated , yellowish-white, both valves 
closely concentrically ridged throughout ; umbones small, curved 
Fics. 3, 3a.—Sinodia jukes-browniana, sp. n. (nat. size). 
, 
») 
1 
3b.— ‘f 5 hinge, x 3. 
2 ” 
inwards, not prominent; lunule large, cordiform; dorsal margin 
sharply arched; ventral margin anteriorly slopingly rounded, pos- 
teriorly gently rounded ; anterior side sloping above, rather sharply 
rounded in the median part; posterior side slightly produced 
below, steeply sloping and very gently rounded above; teeth in 
both valves normal; interior of shell pinkish, shading to pure 
white towards the ventral, anterior and posterior margins. 
Long. 27°5, lat. 25°5 mm. 
Hab.—Canal near Chingrighatta, outskirts of Calcutta. 
Family CyRENIDAE. 
Cyrena bengalensis, Lamk. 
Anim. s. vert., Cyrena, 10. 
Salt Lakes near Chingrighatta, Calcutta. 
