1889.] ON SOME FRESHWATER 0STRACODA AND COPEPODA. 7 



Specific Characters. — Shell seen laterally, irregular oval, 

 greatest height about in the middle and nearly equalling 3 / 5 

 of the length, anterior extremity obliquely rounded, posterior 

 obtuse, dorsal margin greatly arcuate, almost angular in the 

 middle, ventral nearly straight: seen from above narrow oblong, 

 anterior extremity more pointed than posterior, greatest width 

 in the middle and about equalling 2 / 5 of the length. Surface 

 of shell smooth, shining, only sparingly beset with hairs; right 

 valve not surpassing the left dorsally. Colour yellowish, with 

 two dark brown oblique patches on either side and a narrow band 

 of the same colour close to the anterior edge; coecal appendages 

 of intestine bright green. Claws of inferior antennae and those 

 ■of 1st pair of legs rather elongate and finely denticulate. Caudal 

 rami slightly tapering, almost straight, exterior claw exceeding 

 the half length of the ramus, apical seta much shorter than the 

 dorsal. Length of female 1,30 mm; of male 1,15 mm. 



Remarks. — There cannot, I think, be any doubt as to the 

 identity of this form with that described by Baird under the 

 above name from India. It is very nearly related to the Eu- 

 ropean species C. salinus (Brady), though differing by a some- 

 what less elevated shell and by the colour of the latter. 



Description. — The shell of adult female specimens attains 

 a length of 1.30 mm; that of the male is somewhat smaller, 

 scarcely exceeding a length of 1,15 mm. 



In a lateral aspect the shell of the female (PI. I, fig. 1) 

 exhibits a somewhat irregular oval form, with the anterior 

 extremity a litle lower than the posterior. The greatest height 

 is situated about in the middle and considerably exceeds the 

 half length, or, more precisely, equals 3 /& of the total length. 

 The dorsal margin is greatly vaulted and almost angular in the 

 middle, sloping rather abruptly to either extremity, though 

 somewhat more steeply to the anterior. The ventral margin, 

 on the other hand, is nearly quite straight, or very indistinctly 

 sinuated in front of the middle. The anterior extremity is ob- 

 liquely rounded, whereas the posterior appears more obtusely 

 truncate, with the lower part a little projecting. Seen from 



