REPORT ON THE OSTRACODA. 81 



angular, produced below the middle, the lower half Ijearing several short blunt spines ; 

 dorsal margin well arched, ending posteriorly in an abrupt angle ; ventral margin 

 moderately convex ; end view elongated, rhomboidal, twice as long as broad, widest in the 

 middle, whence the margins converge abruptly at an angle towards either extremity ; 

 extremities equal, bimucronate ; end view triangular, with rounded angles, and slightly 

 convex sides. The valves are ornamented with numerous large, roundish, or angular 

 excavations ; the hinge-tubercles are prominent and polished ; there is a sharply-defined 

 ridge or crest running at a little distance within, and parallel to, the ventral border, 

 continuing round the posterior and dorsal margins, and gradually becoming lost near the 

 anterior extremity ; another as distinctly marked ridge runs close along the ventral 

 margin ; these ridges are most distinctly seen on the ventral aspect of the shell, and the 

 intervals are ornamented with angular sculpture. Length, l-28th of an inch ('9 mm.). 



Found in anchor-mud from 7 fathoms in Hong Kong Harbour ; also in a dredging 

 from the Inland Sea, Japan, lat. 34° 20' N., long. 133° 35' E.; 15 fathoms. The type 

 specimens also were from Hong Kong. 



[PI. XX. fig. 5, a~f. a Shell of female seen from left side, h from above, c from 

 below, d from front, e male from left side, /from above. All magnified 40 diameters.] 



34. Cytliere suhriifa, n. sp. (PI. XX. fig. 3, a-f). 



Carapace, seen from the side, oblong, subquadrangular, higher in front than l^ehind, 

 height equal to rather more than half the length; anterior extremity well-rounded, 

 posterior truncated, scarcely rounded, fringed below the middle with several short blunt 

 spines of irregular size, inferior angle rounded ofi"; dorsal margin gibbous over the hinge 

 tubercle, thence sloping backwards with a gentle curve, and sinuated just in front of 

 the hinder extremity which forms a somewhat produced angle ; ventral margin straight ; 

 seen from above, ovate, twice as long as broad, the greatest width situated in the middle, 

 sides evenly and continuously curved throughout ; extremities acuminate, a slight con- 

 striction in front of the hinder one ; end view ovate, broad below and tapering above, 

 height greater than the width. The surface of the valves is marked with a reticulated 

 pattern, enclosing angular, finely punctated areolae, the hinge-tubercles are poHshed and 

 prominent, and the anterior and posterior extremities produced so as to form flange-like 

 borders which are marked with transverse hair-like lines. Length, l-33d of an inch 

 (77 mm.). 



A good series of this species was obtained in Balfour Bay, Kerguelen Island, from a 

 depth of 20 to 50 fathoms (Station 149); also off Prince Edward's Island, 50 to 150 

 fathoms. 



[PL XX. fig. 3, a-f. a Shell of female seen from left side, b from above, 

 c from below, d from front, e male seen from left side, / from front. Magnified 40 

 diameters.] 



(ZOOL. CHALL. EXP. PAET III. — 1880.) C 11 



