COLLECTED IIST CETLON. 305 



extremities well rounded, the posterior rather the wider of the 

 two ; dorsal margin almost straight, ventral deeply sinuated in 

 front of the middle : seen from above, the outline is compressed, 

 ovate, much tapered, and sharply acuminate in front, rounded 

 behind, thrice as long as broad. Surface of the valves smooth, 

 marked with numerous large circular papillae. Length -^-^ of an 

 inch ("46 millim.). 



One specimen only of this species was observed. 



Family CvTHERiDiE. 



Grenus Cythere, Mutter. 



Ctthebe TETJNCAi'TJLA, u. sp. (Plate XXXIX. figs. 25-28.) 

 Carapace of the female, seen from the side, subquadrangular, 

 rather higher in front than behind, height equal to more than 

 half the length ; anterior extremity broadly and rather obliquely 

 rounded, posterior narrowed and abruptly truncated ; dorsal 

 margin straight in the middle, slightly curved towards the 

 extremities, ventral sinuated in the middle and bent upwards 

 behind .- seen from above, ovate, twice as long as broad, widest 

 behind the middle ; posterior extremity moderately wide, rounded, 

 anterior obtuse, subtruncate. Surface of the valves marked 

 throughout with large, closely -set, and deep angular pits. 

 Length -^-^ of an inch ('5 millim.). The shell of the male differs 

 only in its more slender proportions, the height and width being 

 less and the length rather greater. 



This is an abundant species, and much resembles the European 

 C. villosa, Sars, in its sculpture, though not in the shape of the 

 shell. 



Ctthere fabacea, n. sp. (Plate XL. figs. 4-6.) 

 Carapace of the female, seen from the side, somewhat siliquose, 

 the postero-ventral angle being somewhat produced ; extremities 

 obliquely rounded and nearly equal, the posterior sloping steeply 

 and with only a slight curvature ; dorsal margin evenly arched 

 and forming with the extremities one continuous curve, ventral 

 sinuated in the middle ; the antero -ventral angle is crenulated 

 with about a dozen notches : seen from above, the outline is 

 ovate, twice as long as broad, the greatest width in the middle ; 

 extremities rounded, obtuse. Surface smooth, marked with 

 numerous large and closely-set subrotuud pits. Length -^ of an 



