The Fresh-water Entomostrace of Cape Province. 329 



pointing obliquely downwards. Surface of shell without any obvious 

 sculpture, lower edges of valves, as usual, densely clothed with delicate, 

 partly finely ciliated setae. Eye comparatively small ; ocellus, on the 

 other hand, very fully developed, being about three times as large 

 and triangular in form. Antennulae extending almost to the tip of 

 the rostrum. Tail-piece large and expanded, with the distal part of 

 the hind edge, below the anal sinus, gently curved and minutely 

 ciliated, submarginal spines unusually long and slender, about eight 

 on each side, each of the spines being accompanied above with two 

 much smaller spinules ; apical claws rather slender and only slightly 

 curved, each with a very minute denticle at the base. 



Colour bright red. 



Length of shell reaching 1"2 mm. 



Remarks. This is a very distinct species, easily recognisable from 

 the other known forms of the present genus by the quite smooth 

 shell and by the very long and slender sub-marginal spines of the tail- 

 piece, the latter character having indeed suggested the specific name 

 here proposed. It is also of larger size than any of the other species. 



Occurrence. This handsome form was reared in considerable 

 numbers from one of the parcels of mud kindly sent to me by Dr. 

 Purcell in 1909, and procured from a small pool in the Cape Flats, 

 alongside the railway line between Retreat and Lakeside. Only 

 female specimens of this form were observed. 



27. LEYDIGIA PEOPINQUA, G. 0. Sars. 

 (Plate XXXVIII, figs. 1, 1 a, 6.) 



Leydiijiii j.>ruji>tiiqi.i.(i, Gr. O. Sars. Fresh-water Entoniostraca from 

 China and Sumatra. Arch. f. Math. u. Naturv., 1903, p. 14, pi. 1, 

 figs. 4, 4 a. 



Specific Characters Female. Shell, seen laterally, broadly tri- 

 angular in outline, widening distally, and less obliquely truncated 

 behind than in the preceding species ; dorsal margin evenly arched 

 throughout, hind edges of valves with a very conspicuous bulging in the 

 middle. Head only slightly procumbent, rostral projection compara- 

 tively short and obtuse. Surface of valves very distinctly sculptured 

 with somewhat irregular longitudinal striae partly anastomosing with 

 eiich other. Eye of moderate size ; ocellus scarcely larger and located 

 nearly in the middle between the eye and the tip of the rostrum. An- 

 teuuulae scarcely extending as far as the latter. Tail-piece very broad 

 and expanded, with the distal part of the hind edge boldly curved ; 

 sub-marginal spines less slender than in the preceding species and 



