COLLECTED IIT CETLOTf. 311 



Shell of the male, seen laterally, oblong, obliquely quadrate, of 

 equal height throughout, height equal to half the length ; ante- 

 rior extremity obliquely rounded and fringed with about six 

 small triangular teeth ; posterior extremity oblique, rounded off 

 below, bearing a short sharp spine in the middle, and usually one 

 smaller one above, upper half of the margin obliquely truncate ; 

 dorsal margin nearly straight, ventral straight in front, curving 

 upwards behind : seen from above, oval, with acuminate extrem- 

 ities, twice as long as broad, a slight angular alate prominence 

 on each side behind the middle : end-view almost square with 

 roimded angles, dorsal margin centrally emarginate, ventral 

 keeled. Surface marked with a rather coarse, raised, reticulated 

 pattern, and with two longitudinal crests, one obliquely in the 

 middle line of the valve, the other just within the ventral margin 

 and ending in a sharp angle behind the middle, forming, when 

 seen from below, a slight lateral ala ; there is also a deep trans- 

 verse furrow across the middle of each valve. Length JL of an 

 inch ("6 millim.). 



This was the most abundant species in the Calpentyn dredging. 

 It is larger than the ordinary run of Gytherurce, has no central 

 areola, and on the whole seems to come more appropriately under 

 Gythere, though the posterior beak gives it an appearance similar 

 to Cytherura. I do not now see any sufficient reason for the sepa- 

 ration of G. hataviana and G, iniqua. 



Grenus Ctthebidea, Bosquet. 



Cytheeidea orientalis, n. sp. (Plate XL. figs. 16-18.) 

 Shell, seen from the side, oblong, subovate, highest in the 

 middle ; height scarcely equal to half the length ; anterior extre- 

 mity rounded, posterior narrower, rounded off at the ventral 

 angle ; dorsal margin arched, sloping with a very gentle curve to 

 the front, and much more steeply behind, ventral slightly sinu- 

 ated : seen dorsally, the outline is ovate, widest in the middle, 

 more than twice as long as broad, tapering equally to the ex- 

 tremities, which are pointed. Surface smooth, polished, marked 

 with numerous circular, hair-like papillae. Colour whitish or 

 creamy. Length -^-^ of an inch (1 millim.). 



Cytheeidea pusilla, n. sp. (Plate XL. figs. 13-15.) 

 Shell rather tumid, ovate : seen from the side, about twice as 

 long as broad, highest in the middle ; anterior extremity obliquely 



