DI me 



186 



in the middle, upper corner obtuse, lower more prominent, but blunt at the 

 end; seen dorsally, subovate in outline, with the greatest width nearly equal 

 to half the length, side-edges straight in the middle and scarcely at all angular 

 behind, both extremities gradually contracted, the anterior more pointed than 

 the posterior. Surface of valves rather evenly convex, with a very slight 

 expansion below the posterior part, anterior edges and lower part of posterior 

 very slightly and somewhat irregularly crenulated, being moreover clothed with 

 fine hairs; sculpture well marked and of the usual kind. Anterior antennae 

 with the terminal joint rather small, scarcely exceeding in length ! / 3 of the 

 preceding joint. Posterior antennae comparatively short and stout. 



Male not yet examined in detail. 



Colour of shell yellowish brown. 



Length of adult female 0.74 mm. 



Remarks. The above-described species is easily distinguished from those 

 recorded in the preceding pages by the rather narrow and elongated shape of 

 the shell, and by the more evenly convex surface of the valves. The struc- 

 ture of the limbs is however not very different. 



Occurrence. This form was originally described from some empty shells 

 found by my late father in shell-sand from 0xfjord, Finmark. I have sub- 

 sequently had an opportunity of examining this form in the fresh and living 

 state, a few female specimens being taken at Korshavn, south coast of Norway 



Distribution. British Isles, Bay of Biscay, Cape Vert. 



88. Hemicythere quadridentata, (Baird). 



(PI. LXXXVI, fig. 1). 

 Cy there quadridentata, Baird, British Entomostraca, p. 173, PI. XXI, fig. 2. 



Specific Characters. Female. Shell, seen laterally, oblong subquadrangu- 

 lar or somewhat clavate in shape, rather higher in front than behind, greatest 

 height only slightly exceeding half the length, dorsal margin somewhat pro- 

 minent in the ocular region and sloping gently behind at an almost straight 

 course, ventral margin very slightly sinuated in front and quite straight behind, 

 anterior extremity broadly rounded, posterior much narrower and obliquely 

 truncated, upper corner rounded off, lower somewhat produced and blunt at 

 the end; seen dorsally, narrow and somewhat irregularly oblong in outline, 

 greatest width not nearly attaining half the length, side-edges angularly waved, 

 both extremities somewhat blunt at the end. Surface of shell rather uneven, 

 each valve exhibiting in the posterior part, above a somewhat projecting 





