REPORT ON THE OSTRACODA. 97 



off Boob)- Island (Station 187), 6 to 8 fathoms; and Hong Kong Harbour, 7 fathoms. 

 It was first described from specimens taken in the China Seas. 



[PI. XXV. fig. 7, a-g. a Shell of female seen from left side, h from above, c from 

 below, d from front, e male seen from left side, _/" from below, g from front. All magnified 

 50 diameters.] 



63. Cythere adunca, G. S. Brady (PI. XXV. fig. 6, a-d). 



Cythere cerehralis, Brady, Les Fonds de la Mer, torn. i. p. 63, pi. vii. figs. 12-14. 



Shell, seen from the side, oblong, flexuous, irregularly subrhomboidal, rather higher 

 in front than behind, height equal to more than half the length ; anterior extremity 

 obliquely rounded, not spinous, jjosterior truncated, narrow and sinuous ; dorsal margin 

 very irregularly sinuous, and prominent over the hinge-tubercle, ventral strongly convex 

 and sharply up-turned towards the hinder extremity ; seen from above, the outline is sub- 

 ovate, twice as long as broad, the greatest width situated near the middle ; the sides are 

 irregularly jagged, and have a spinous projection near the posterior extremity, the 

 anterior extremity is broad and truncated, the posterior obtusely rounded ; end view 

 subtriangular, with rounded angles, very convex base, and truncated apex. Surface of 

 the valves very uneven and irregularly excavated, and on the anterior and inferior mar- 

 gins bordered by a wide, tumid lip or flange. Length, l-42d of an inch ("6 mm.). 



Dredged in lat. 9° 59' S., long. 137° 50' E., 28 fathoms (Station 189), and in lat. 

 5° 26' S., long. 133° 19' E., 580 fathoms (Station 196a). 



The type-specimens of Cythere adunca are from Batavia, Pamalang, and Pamanockan 

 (Java), localities not far removed from those of the Challenger dredgings in which it 

 was found. The species might almost be taken to be Cythere goujoni, T\dth all its 

 characters gnarled and distorted ; the one looks rotund, sleek, and well fed, the other 

 shrunken, angular, and bony ; there is scarcely more difierence than between an 

 alderman and a crossing-sweeper. Between Cythere 2^(f']puensis, Cythere gonjoni, and 

 Cythere cerebralis, possibly specimens may be found completely to bridge over the gaps ; 

 to a certain extent, indeed, this may already be done from the material brought home 

 hj the Challenger, and it is quite likely that further investigation might even bring into 

 the same series Cythere hodgii and Cythere darivini. The specific name cerehralis, 

 previously applied to this species is withdrawn, having been already used for another 

 member of the genus by M. Bosquet. 



[PI. XXV. fig. 6, a-d. a Shell seen from left side, h from above, c from below, d 

 from front. Magnified 50 diameters.] 



64. Cythere darivini, G. S. Brady (PI. XXV. fig. 2, a-g). 



Gytliere darivini, Brady, Les Fonds de la Mer, torn. i. p. 71, pi. viii. figs. 17, 18. 

 Shell of the female, seen laterally, subquadrangular, height greater than half the 



(ZOOL. CHALL. EXP. PART lU. 1880.) C 13 



