REPORT ON THE OSTRACODA. 



115 



[PI. XXVII. fig. 1, a-j. a Carapace of female seen from left side, h from above, 

 r from below, d from front ; e male seen from left side, f from below, g from front, h-j 

 valves of left side. All magnified 50 diameters.] 



3. Krithe hycdimt, n. sp. (PI. XXVII. fig. 3, a-d). 



Carapace, as seen from the side, subovate, higher in front than behind, greatest 

 height situated near the middle, and equal to at least half the length ; anterior extremity 

 broadly rounded, posterior narrower and rather oblique, dorsal margin slightly arched, 

 flattened, and sloping somewhat steeply behind the middle, ventral margin nearly 

 straight ; seen from above, oblong, ovate, widest in the middle, width equal to scarcely 

 half the length ; anterior extremity subacuminate, posterior wider and deeply emar- 

 ginate ; end view subcircular. Shell translucent, polished, marked with a few scattered 

 circular papillse. Length, l-52d of an inch ("49 mm.). 



The smaller size, more ovate form and posterior depression of the shell, are the 

 characters on which I depend to separate this from other species of the same genus. 

 The only dredging in which I have found it is that from the Inland Sea of Japan, where 

 it occurred in a depth of 15 fathoms on a muddy bottom (Station 2336). 



[PL XXVII. fig. 3, a-d. a Shell seen from left side, b from above, c from below, 

 d from front. Magnified 50 diameters.] 



4. Krithe tumida, n. sp. (PI. XXVII. fig. 4, a-d). 



Shell oblong, tumid ; seen from the side, subovate, somewhat lower in front than 

 behind, height equal to about two-thirds of the length ; anterior extremity rounded 

 off, posterior broader, oblique, and scarcely rounded ; dorsal margin very slightly arched, 

 highest near the middle, ventral gently convex ; seen from above, the outline is broadly 

 ovate, the greatest width in the middle, and exactly equal to the height ; the lateral 

 margins are subparallel until near the two extremities, where in front they converge 

 suddenly forming an acute angular extremity, and behind are broadly rounded off, but 

 show a moderate central indentation ; the end view is subcircular, but broadly indented 

 at the ventral margin. Surface of the shell quite smooth. Length, l-48th of an inch 

 ("51 mm.). 



