COLLECTED IN CETLOK. 307 



Ctthere sttbcfiteata, n. sp. (Plate XXXIX. figs. 29-30.) 

 Shell, seen from the side, elongated, subcuneiform, higher in 

 front than behind ; heigbt scarcely equal to half the length ; 

 anterior extremity very obliquely rounded, posterior narrowed, 

 obliquely truncated, and slightly produced at the ventral angle ; 

 dorsal margin elevated at the anterior third, thence sloping with 

 a slightly sinuous curve backwards, steeply and with a regular 

 curve to the front ; ventral margin gently sinuated : seen from 

 above, the outline is regularly ovate, widest in the middle, more 

 than twice as long as broad ; extremities rather wide, subacurai- 

 nate. Shell-surface marked with numerous shallow circular pits 

 with rounded papillae in the interspaces, the pits coalescing into 

 furrows on the anterior and ventral surfaces. Length gL of an 

 inch ("75 millim.). 



This species is represented in the Calpentyn gathering by 

 several specimens. 



Cttheee coralloides, n. sp. (Plate XXXIX. figs. 19-22.) 



Shell, seen laterally, subquadrate, twice as long as broad, greatest 

 height situated near the front ; anterior extremity obliquely 

 rounded, its lower half bordered with short equal teeth, posterior 

 truncated, slightly emarginate above the middle but not toothed ; 

 dorsal margin forming an elevated angle over the anterior hinge- 

 tubercle (which is large and glistening), thence sloping in an 

 irregular sinuous line to the posterior extremity; ventral margin 

 nearly straight ; seen from above, broadly ovate, widest behind 

 the middle, scarcely twice as long as broad ; posterior extremity 

 wide and rounded, with a broad median prominence, anterior 

 narrow, subtruncate. Surface of the shell marked everywhere 

 with coarse angular impressions, and having one or more indis- 

 tinct, flexuous, longitudinal ribs on the lateral aspect of the valves. 

 Length gV of an inch ('77 millim.). 



There are two forms of this species : — one, from which the 

 description has been drawn up, tumid and rounded in its outlines, 

 the other (probably the male) smaller, more slender, and angular. 

 Both of these forms are here figured. If tlie more slender form 

 be really the male, it is probably not full-grown, inasmuch as the 

 males of Cythere are usually longer than the females. All these 

 angular specimens are, however, in this case smaller than the 

 rounded ones. 



