368 MR. G. S. BRADY ON NEW OR IMPERFECTLY 
4. CyrHerive!s (?) oryza,n. sp. (Pl. LVIII. fig. 2, a, b.) 
Valves elongate, convex. Dorsal margin arched ; ventral nearly straight, slightly pro- 
tuberant posteriorly. Anterior margin somewhat obliquely flattened ; posterior rounded, 
more pointed than the anterior. Dorsal aspect oblong ovate. Surface smooth, pellucid, 
mottled with white or straw-coloured patches. 
Length zo in. (‘63 mm.). 
Hab. Hunde Islands (Dr. Sutherland’s dredgings). 
Not unlike in outline to Egger’s figure of Bairdia arcuata; but distinct from that 
species as described and figured by M. Bosquet and Professor T. R. Jones. 
5. CyrHeripEIs LATA, n. sp. (PI. LVIII. fig. 4, a, 0.) 
Carapace reniform, flattened, broadest in front. Extremities rounded. Dorsal margin 
arched, highest a little in front of the middle. Ventral margin rather deeply sinuated. 
The anterior border forms a flattened lamina, which is continued halfway along the 
ventral margin. Surface smooth or very faintly pitted. Dorsal aspect oblong, much 
compressed. 
Length 3} in. (‘78 mm.). 
Hab. Abrolhos Bank. 
6. CyrHERIDEIS NoBILIs, n. sp. (PI. LVIII. fig. 9, a-e.) 
Reniform, convex, narrowed in front, nearly twice as long as broad. Dorsal margin 
forming a flattened arch ; ventral deeply sinuate in the middle. Anterior margin narrow, 
well rounded ; posterior forming a strongly marked angle at its junction with the ventral 
border. A narrow, flattened lamina or flange runs along the ventral margin, and is 
most developed posteriorly. Dorsal aspect oval. Lucid spots large, mostly six in 
number ; five of them forming an irregular rosette, the sixth slightly apart toward the 
dorsum. Surface smooth, pale brown, mottled with darker spots, and bearing a few 
distant, short setz. 
Length ;'g in. (1°8 mm.). 
Hab. Suda Bay, Crete, 40 fathoms (Capt. Spratt’s soundings). Many specimens. 
Young specimens have the two extremities equal, and are destitute of the produced 
posterior angle. The posterior portion of the valve in mature individuals is marked 
with a reticulated pattern (which, however, is often obscured by opacity), in this 
respect, as well as in its angular character, bearing a remarkable resemblance to the 
freshwater Candona lucens. 
7. CyTHErRipzis (?) putcHRa, nu. sp. (Pl. LVIII. fig. 3, a-c.) 
Ovate, convex, highest in front. Dorsal margin arched ; ventral straight, or very 
slightly sinuated anteriorly. Ewtremities rounded, the anterior being much the broadest. 
Dorsal aspect ovate, narrowed in front. Surface smooth, white, marked with thickly 
