too 



MR. G. S. BRADY'S MONOGRAPH OF 



Carapace oblong, reniform. Seen from the side, the valves are rather higher in front 

 than behind the height a little more than equal to half the length. Anterior margin 

 bra lly rounded, posterior slightly rounded, subtruncate; dorsal margin very slightly 

 arched, sloping gently backwards, ventral conspicuously incurved in front of the middle. 

 Outline, as seen from above, compressed, ovate, breadth equal to more than one-third of 

 the length; anterior extremity obtusely pointed, posterior more rounded. End view 

 i ) v,i 1 . Surface of the shell uneven, marked with irregular furrows and elevations. Hinge- 

 joinl well developed. Colour deep yellowish brown. One eye. Antennae short and 

 thick, Li 4 joint of the upper equal in length to the preceding. Second joint of the last 

 pair of feet scarcely longer than the united length of the two following; terminal claw 

 short and thick. 



Length Vo in., height yJq in. 



Hab. In rock-pools at Mount's Bay, Cornwall, Herm* Guernsey, Arran, and Loch Carron, N. B. {Rev. 

 A. M. Norman) ; in shell-sand, Roundstone (Dr. Alcock), Birterbuy Bay, 15 fathoms, and amongst 

 oystcr-oozc from Stranraer (G. S. B.) ; dredged in the Minch, 45-60 fathoms (Mr. J. G. Jeffreys) ; 

 Cumbrae (Mr. D. Robertson) ; Scarpa Flow, Orkney (Mr. E. C. Davison). 



C. India i- one of the less-common British species; in outline it is not very unlike 

 C. pellucida, but much smaller. 



7. Ctthere obloxga, Brady. (Plate XXXI. figs. 14-17.) 



Cythert oblonya, Brady, Trans. Zool. Soc. vol. v. p. 373, pi. 59. figs. 5 a-d. 

 Mediterranean type. Distribution' : Recent— England, Bay of Biscay, Mediterranean. 



Carapace, as seen from the side, oblong, subquadrangular, equal in height throughout, 

 height equal to nearly half the length. Anterior margin obliquely rounded, minutely 

 and numerously dentate, posterior truncate and angular ; superior margin straight or 

 very slightly curved, inferior nearly straight in front, behind irregularly emarginate or 

 obaoletely toothed. Seen from above, the outline is ovate, greatest breadth equal to 

 much more than one-third of the length; extremities obtusely rounded; hinge-margins 

 depressed behind the middle. Surface irregularly marked with deep angular pittings of 

 very variable size ; a well-marked tubercle over the anterior hinge. Within the anterior 

 margin is usually a raised crenulated ridge, which is marked with radiatim? transverse 



hair-like lines. Colour yellowish brown. Animal unknown 

 Length ^ in., height ^ in. 



Hab. In shell-sand, Mumbles (South WVIp^ 



** 



palp 1 \ 



linear, slender. 

 a. Urticating seta long in male, short in female. 



b. CviuEiiE rtjbida, n. sp. (Plate XXXII. figs. 71-74.) 



Carapace of the female, as seen from the side, subreniform, highest in front of the 

 middle, greatest height equal to more than half the length. Extremities rounded, the 

 anterior much the broader ; superior margin highest above the eye, whence it slopes 



