400 



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 

 broadly 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 

 oval. Surface of the shell uneven, marked with irregular furrows and elevations. Hinge- 

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

 thick, last 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 in., height iu. S" ^ . vi" 'Vww- 



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

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

 oyster-ooze 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. badia is one of the less-common British species ; in outline it is not very unlike 

 C. pellucida, but much smaller. 



7. Cythere oblonga, Brady. (Plate XXXI. figs. 14-17.) 

 Cythere oblonga, 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 

 obsoletely 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 radiating transverse 

 hair-like lines. Colour yellowish brown. Animal unknown. 



Length in., height ^ in. \ ,^ 



Hab. In shell-sand. Mumbles (South Wales). 



** Mandibular palp four-jointed, bearing on its inner margin three strong, curved, plumose seta: ; last joint 



linear, slender, 

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



8. Cythere rubida, n. sp. (Plate XXXIL 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 



