On Fresh-water Entomostraca. 53 



25. Cypris lateraria, King. 

 (PI. 7, figs. 3, a— c). 



Cypris lateraria, King, 1. c, p. 65, Pl. X G. 



Specific Characters. — Shell ventricose, seen later- 

 ally, clavate in form, much higher in front than behind, 

 anterior extremity broadly rounded, posterior subtruncate, 

 dorsal margin subangular above the eye, and gradually 

 sloping behind, ventral deeply sinuated: — seen dorsally, 

 regularly ovate, with the greatest width fully equalling the 

 height, and occurring behind the middle, anterior extremity 

 more pointed than the posterior. Valves very unequal, the 

 left one being much the larger, and overlapping the right 

 both anteriorly and posteriorly. Surface of shell of a dull 

 appearance, being distinctly granular all over, and also 

 armed with scattered tubercles, more conspicuous towards 

 both extremities, which are densely hairy. Caudal rami 

 moderately strong, nearly straight, outer claw not attaining 

 half the length of the ramus. Colour of shell uniformly 

 yellowish green. Length 1,05 mm. 



Remarks. — This is a very distinct species, and un- 

 doubtedly that recorded by Mr. King under the above 

 name. In outward appearance it somewhat resembles the spe- 

 cies of the genus Ilyocypris, and, indeed, I at first believed 

 it to belong to that genus. A closer examination of the 

 several appendages has, however, shown it to be a true 

 Cypris. 



Description of the female. 



The length of the shell, in fully grown specimens, but 

 little exceeds 1 mm., and this form is accordingly of rather 

 small size. 



