18 
Measurement :—Anterior to posterior, 32+; umbones to 
ventral margin, 20} ; thickness (valves united), 14 millim. 
Hab. :—Umtwalumi River Mouth, N. by W., 7 miles, 
50 fathoms. 
A fine large species somewhat resembling the Australian 
C. latisulcata, Ten-Woods, but much more finely, closely and 
obliquely ridged. 

CUSPIDARIA NASUTA, n.sp. (Plate VII., fig. 14). Shell 
elongately pyriform, rather compressed, thin, whitish, rounded 
in front, attenuately produced behind; surface somewhat 
rugose with irregular growth lines, a concave depression 
defining the rostrum. Posterior dorsal margin concave near 
the umbones, then horizontal and nearly straight ; anterior 
convex, slightly sloping ; ventral margin rather long, slightly 
arcuate ; rostrum long, rather narrow ; dorsal area concavely 
depressed, long and rather narrow ; umbones rounded almost 
touching one another. Interior smooth, muscular scars 
indistinct ; pallial line simple, with a very slight sinus on the 
posterior side ; cartilage pit very small. 
Measurement :—Anterior to posterior, 21; umbones to 
ventral margin, 10: thickness, 74 millim. 
Hab. :—Cape Point Lighthouse, 85 fathoms. 
Compared with C. rostrata, the body of the shell is more 
oblong. 
CUSPIDARIA (CARDIOMYA) GILCHRISTI, n.sp. (Plate VII., 
fig. 17). Shell irregularly pyriform, moderately inflated, thin, 
whitish, closely radiately ribbed throughout ; ribs regular, 
equidistant, rounded, rather broader than the interstices, 
becoming irregular on the posterior side, and almost obsolete 
on the rostrum. Umbones approximating, inclined towards 
the posterior side, and situated rather nearer the posterior 
than the anterior ; posterior dorsal margin deeply incurved ; 
anterior arcuate ; rostrum rather short. 
Measurement :—Anterior to posterior, 14; umbones to 
dorsal margin, 9; thickness, 7 millim. 
Hab. :—Cape Natal, W. 3? N., 12} miles; 85 fathoms. 

CUSPIDARIA (CARDIOMYA) FORTICOSTATA, n. sp. (Plate VII., 
fig. 15). Shell sub-pyriform, rather compressed, whitish, 
radiately ribbed; ribs very unequal, on the anterior side 
(about one-third of the entire surface), they are about 30 in 
number, rather close together, narrow, rounded, and but 
little raised, then from the central area inclining towards the 
posterior side are three much more elevated, narrow and diverg- 
ing, with broad flatly depressed interstices, from thence to the 
