440 DR. G. S. BEADY ON NEW OE 



The test of this species is so very thin that it is impossible to examine it in the dry 

 condition owing to its rapid shrivelling, and the markings are very difficult to make out 

 accurately in fluid ; the disposition of the ridges seems, however, to be very much like 

 that of S. hanseni. 



Genus Cypris O. F. Midler. 



Cypris viridis Thomson. (Plate XLV. tigs. 22-24.) 

 Cypris viridis Thomson (i), p. 253, pi. xi. fig. A. 2a-g. 



Shell of the female short and very tumid ; seen from the side (fig. 22) reniform, very 

 slightly depressed in front, height equal to nearly two-thirds of the length ; extremities 

 well rounded, dorsal margin boldly and evenly arched, ventral slightly sinuated in the 

 middle ; seen from above (fig. 23), very broadly ovate, greatest width behind the middle 

 and equal to about three-fourths of the length, anterior extremity abruptly tapered 

 and subacute, posterior broadly rounded ; lateral margins strongly arcuate, converging 

 steeply towards the front. Shell-surface finely punctated and covered with short, 

 rather rigid hairs ; the anterior and posterior extremities bordered by a narrow, 

 pellucid flange, which is fringed with a single series of very fine hairs; behind this 

 flange is a thicker band marked by irregular transverse glandular (?) streaks; left valve 

 overlapping the right on the dorsal and posterior aspects. Colour an opaque dark 

 green. Length - 9 mm. Post-abdominal rami (fig. 24) very small and slender; terminal 

 seta as long as the ramus itself, lateral seta about half as long and attached very near 

 the apex ; the minor apical seta is extremely minute. 



Hah. " In pools about Duneclin and Taieri Plan" (G. M. Thomson). 



Genus Cyprinotus G. S. Brady. 

 Cyprinotus Brady (3), p. 301 ; G. O. Sars (2), p. 5 (separate copy). 



Cyprinotus plavescens, sp. n. (Plate XL VI. figs. 28, 29.) 



Shell, seen from the side (fig. 28), reniform, highest in the middle, height equal to 

 rather more than half the length ; extremities rounded, anterior wide and almost 

 subtruncate, posterior narrower and slightly depressed ; dorsal margin forming an 

 evenly flattened arch, ventral gently sinuated towards the front; seen from above 

 (fig. 29) the outline is compressed, ovate, widest in the middle, more than twice as 

 long as broad, gradually tapered towards the acuminate anterior extremity, narrowly 

 rounded behind ; surface of the valves quite smooth. Colour yellowish. Length 

 2-2 mm. 



Hob. Dunedin district (exact locality lost). 



The soft parts of the animal agree accurately with those of the typical Cyprinotus, 

 but there is not so much inequality of the valves as in the better-known species. 



