1889.] ON SOME FRESHWATER OSTRACODA AND COPEPODA. 25 



2. Cyprinotus cingalensis, Brady. 



(PL I, figs 5, 6; PI. III, fig. 12). 



Cyprinotus cingalensis, Brady, Notes on Entomostraca col- 

 lected by Mr. A. Haly in Ceylon. Linn. Soc. Journ. Zool. Vol. 

 XIX, p. 302, PI. XXXVIII, flg. 28-30. 



Specific Characters. -- Shell seen laterally subtriangular, 

 greatest height about in the middle and equalling nearly 2 / 3 of 

 the length, anterior extremity obliquely rounded, posterior obtuse, 

 dorsal margin greatly elevated, forming in the middle a rounded 

 gibbous projection, ventral almost straight: seen from above ob- 

 long ovate, anterior extremity more pointed than posterior, 

 greatest width behind the middle and not quite equalling half 

 the length. Surface of shell smooth, beset with scattered fine 

 hairs. Valves very unequal, left overlapping the right at both 

 extremities, but dorsally at a considerable extent surpassed by 

 the gibbous projection of the right. Colour rather similar to 

 that in the preceding species. Length of adult female 1,20 mm. 



Bemarks. — This species, though very nearly related to 

 the preceding, is readily distinguished by the peculiar gibbous 

 dorsal projection of the right valve, a character upon which 

 Mr. Brady would seem to have especially based his genus 

 Cyprinotus. As to the identity of this form with that described 

 by the latter author under the above name, there cannot, I 

 think, be any doubt. 



Description. — The shell of the adult female measures 1,20 

 mm. in length, being thus a little smaller than that of the 

 preceding species. 



Seen laterally (PI. I, fig. 5) the shell exhibits a somewhat 

 triangular form, the height being relatively considerably greater 

 than n C. dentato-marginatus and nearly attaining 2 / 3 of the 

 length. As in the latter species the anterior extremity is obliquely 

 rounded and somewhat lower than the posterior, which is 

 more obtusely truncated. The dorsal margin is greatly elevated 

 and exhibits a little behind the middle a peculiar rounded gib- 

 bous projection, rather sharply defined from the other part of 



