G G. O. Sars. 



inferior antennæ are fairly well developed, allowing the 

 animal to move rather quickly through the water. In this, 

 as also in other respects, it agrees with the species of the 

 genus Stenocypris, though exhibiting well-marked specific 

 differences from any of them. 



Description of the female. 



In fully adult specimens the shell has a length of 

 2.40 mm., a height of 1.00 mm., and a width of 0.80 mm. 

 This form accordingly grows to a larger size than any of 

 the other 4 as yet known species of the genus. 



Seen from the side (PI. 1, fig. 1), the shell exhibits a 

 rather elongated, subreniform shape, the greatest height but 

 little exceeding 2 , 5 of the length. The dorsal margin is 

 perfectly straight and horizontal, joining the anterior margin 

 by an abrupt, nearly angular bend just above the eye. 

 Posteriorly it passes by a more even curve into the hind 

 margin. The inferior margin exhibits, somewhat in front of 

 the middle, a rather slight sinus, and joins the anterior and 

 posterior margins without any intervening angle. The 

 anterior extremity is broadly rounded, and somewhat obliquely 

 deflexed, whereas the posterior one appears more produced, 

 and narrowly rounded at the tip. 



Seen from above (fig. 2), the shell appears moderately 

 compressed, exhibiting an oblong subfusiform shape, with 

 the greatest width about equalling 1 /3 of the length and 

 occurring behind the middle. The side-contours are but 

 slightly curved, and both extremities appear obtusely pointed, 

 the anterior one being a little narrower than the posterior. 



The surface of the shell is quite smooth and polished, 

 with only the usual small distant pits, and is densely clothed 

 with hairs on both extremities, those of the anterior one 



