368 MR. G. S. BRADY ON NEW OR IMPERFECTLY 



4. Cytherideis (?) ORYZA, n. sp. (PI. 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 ^ in. ('GS 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. Cytherideis lata, n. sp. (PI. LVIII. fig. 4, a, b.) 



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 -^ in. ("78 mm.). 



Hab. Abrolhos Bank. 



6. Cytherideis 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 setae. 



Length xe i"- 0-'^ 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. Cytherideis (?) pulchra, n. sp. (PI. LVIII. fig. 3, a-c.) 



Ovate, convex, highest in front. Dorsal margin arched ; ventral straight, or very 

 slightly sinuated anteriorly. Extremities rounded, the anterior being much the broadest. 

 Dorsal aspect ovate, narrowed in front. Surface smooth, white, marked with thickly 



