294 MR. G. S. BRADY ON EUROPEAN CYPRlDINIDjE. [Apr. 4, 



The male of this species is already sufficiently well known ; hut the 

 female has not heretofore been described, unless, indeed, the form 

 figured by Mr. Norman in the 'Annals and Magazine of Natural 

 History' for 1861 may be supposed to belong to that sex. Mr. 

 Norman's description, however, so far as the structure of the an- 

 tennae is concerned, applies only to the male. Externally the male is 

 easily distinguished by its more elongated and angular form, and by 

 the want of spinous armature at the posterior extremity, the lower 

 angle of which is produced into a blunt subangular prominence ; 

 the upper angle, however, occasionally bears a small tooth. 



7. Philomedes folinii, nov. sp. (Plate XXVII.) 



Female. Carapace as seen from the side subrhomboidal ; greatest 

 height situated in the middle and equal to at least two-thirds of the 

 length ; anterior extremity very prominent in the middle, beak broad 

 and blunt, notch wide and rather shallow ; posterior produced at the 

 ventral angle into a broad triangular projection ; superior margin 

 boldly and evenly arched, inferior also distinctly but somewhat less 

 strongly convex. Seen from above the outline is subhexagonal, with 

 nearly parallel sides, which converge suddenly and angularly towards 

 the extremities ; anterior extremity truncate, notched in the middle, 

 posterior very broadly and bluntly mucronate ; greatest width equal 

 to rather more than half the length : the end view is irregularly 

 heptagonal, the nearly parallel lateral margins ending above and 

 below in prominent rounded angles, the two superior margins con- 

 verging into an irregular arch, the basal margin nearly flat. The 

 surface of the shell is irregularly undulated and closely set throughout 

 with rounded or subangular sharply cut pittings of moderate size and 

 depth, and is strengthened by several strongly projecting rounded 

 ribs, which are disposed as follows : one commencing immediately 

 below the antennal notch, in a conspicuous angular projection, is 

 continued round the interior part of the shell and terminates in the 

 posteal spine ; a second (which is irregularly nodulated at the hinder 

 extremity) rises in the posteal spine, runs upwards within the pos- 

 terior margin, and then strikes somewhat obliquely across the valve, 

 terminating iu a long and sharp beak, which forms the anterior 

 margin of the antennal notch : these two ridges are connected 

 behind the notch by a short transverse prolongation, "which gives off 

 from near its middle a third long and rather flexuous rib run- 

 ning parallel with and midway between those already described, but 

 losing itself before quite reaching the posterior margin ; just within 

 the antero-superior border a fourth but much more feebly developed 

 rib runs backwards to the middle of the superior margin, where it 

 joins an encircling dorsal ridge of about equal development. Length 

 T X j- inch. 



Male. The shell of the male (possibly a young specimen) is alto- 

 gether smaller, but comparatively much more elongated, the height 

 being equal to only half the length ; the shell-structure is similar in 

 character to that of the female, but very feebly developed. Length 

 j\ inch. The secondary branch of the lower antennas in the female 



