500 DR G. S. BRADY ON 



straight. Seen from above, very broadly ovate, greatest width behind the middle, and 

 equal to two-thirds of the length, lateral margins boldly curved and forming a continuous 

 sweep with the wide anterior extremity ; from the widest part of the shell the sides 

 converge abruptly backwards, and terminate in a wide, truncated, central prominence ; 

 margins everywhere jagged or crenated. Shell-surface marked with a raised reticulated 

 pattern, enclosing irregular polygonal excavations. Length 1 mm. 



Habitat. — Banc de l'Aiguille, Noumea, 2-4 fathoms. A very fine and well-marked 

 species, which I have pleasure in naming after Mr T. Scott of the Scottish Fishery Board 

 — a most able and industrious investigator of the Entomostraca and other Invertebrata. 



Cythere cuneolus, n. sp. (PI. II. figs. 6, 7). 



Shell, seen from the side, oblong, quadrangular, highest in front, height equal to fully 

 half the length. Anterior extremity well rounded, posterior narrow, obscurely angulated 

 above, rounded off below, irregularly fimbriated or dentated ; dorsal margin sloping with 

 a slight convexity backwards, ventral sinuated near the front and gently up-curved towards 

 the posterior extremity. Seen from above, the outline is hastate, with irregular margins; 

 widest near the posterior extremity ; width and height equal ; from the widest point the 

 sides converge with an abrupt slant, broken by a conspicuous intervening prominence, to 

 the posterior extremity, which is wide and truncated ; towards the front, which is also 

 wide, but rounded, the sides converge more gradually, but in an undulated line. Shell- 

 surface covered with closely-set fossae, and showing also one or two very vaguely-marked 

 flexuous ribs. Length "45 mm. 



Habitat. — Banc de l'Aiguille, Noumea, 2-3 fathoms ; Mango Island, on fringing reef ; 

 and from shore-sand at Loma-Loma. This may perhaps prove to be only the young form 

 of some other species, the few specimens seen varying considerably in character, — but I 

 am not acquainted with any to which it can properly be referred. 



Cythere torticollis, n. sp. (PI. III. figs. 1, 2). 



Shell, seen from the side, oblong, somewhat higher in front than behind, height scarcely 

 equal to half the length. Anterior extremity obliquely rounded, and slightly crenated 

 below the middle, posterior produced in the middle, its lower half divided into five or six 

 short and broad teeth ; dorsal margin prominent over the anterior hinge, thence sloping 

 gently in a sinuous line backwards ; ventral margin slightly sinuous throughout. Seen 

 from above, the outline is very irregular, twice as long as broad, widest near the posterior 

 extremity ; lateral margins deeply indented at several points, converging suddenly and 

 in a very zig-zag line to the posterior extremity, which forms a triangular, centrally- 

 emarginate prominence ; the anterior extremity is wider, rounded, and emarginatc in 

 the middle. Surface of the valves very rugose, a wide rib just within and parallel to 

 the anterior margin, an abrupt and irregular transverse ridge near the posterior extremity, 

 and irregularly disposed ridges with numerous large fossse on the central portion. Length 

 5*8 mm. 



