212 UK. G. S. BRADY ON THE [Feb. 1, 



throughout, height equal to less than half the length ; extremities 

 well rounded and nearly equal in width ; dorsal margin almost 

 straight, curving gently downwards toward the extremities, 

 ventral slightly sinuated in the middle : seen dorsally (tig. 2), the 

 outline is compressed, subovate, widest behind the middle, rather 

 acutely pointed in front, more obtuse and more abruptly tapered 

 behind ; width equal to about one-third of the length : left valve 

 larger than the right and infolded at both extremities so as to 

 form an overlapping flange * ; surface of the shell smooth ; colour 

 a clouded green with lighter patches. Length 255 mm. (y 1 ^ in.). 



The antennal setse are beautifully plumose and reach to the 

 extremities of the terminal claws (fig. 3) ; the lobe of the first 

 maxilla next following the palp has two of its claws laterally 

 denticulated and terminating in a spear-head (fig. 5) ; palp of the 

 second maxilla (fig. 4) narrow and elongated, masticating portion 

 twisted upon itself toward the base ; posterior legs of the usual 

 form (fig. 6), the last joint small, divided into three distorted 

 finger-like lobes, bearing a single long seta and a strongly falcate 

 claw. Caudal rami (fig. 7) slender, bearing two unequal, strong, 

 apical claws which are marginally pectinated, and two setse, a 

 small one on the dorsal and a much longer one on the lower 

 angle ; the dorsal margin of the ramus is ornamented at its distal 

 end with about four series of delicate spines separated from each 

 other by slight depressions of the margin ; these spinules, reduced 

 very much in size, are continued without intermission along the 

 proximal portion of the limb. 



This is so closely allied in general form and characters to the 

 foregoing species, H. reptans, that it seems to me undesirable to 

 assign it to a distinct genus (Stenocypris) as has been proposed by 

 Professor G. 0. Sars, especially as the variations in anatomical 

 points are comparatively unimportant. 



A single specimen was taken many years ago at Lyndhurst, 

 and remained in my collection unnamed and without description. 

 Since that time I have found it in considerable abundance 

 in the Hatchett Pond (New Forest), in ditches near the River 

 Arun (Sussex), in Conway Marsh (North Wales), and in a pond 

 near Sellafield (Cumberland). 



Herpetocymis strigata O. F. Mailer. (Plate XXVIII. 

 figs. 4-9.) 



1889. Erpetocypris strigata Brady & Norman, (2) p. 85, pi. vi.i. 

 figs. 14, 15. 



1891. Erpetocypris strigata Vavra, (6) p. 84, fig. 27. 



1900. Oypris strigata G. W. Midler, (5) p. 74, pi. xv. figs. 11-13, 

 19, 20. 



Shell, seen laterally, oblong, subreniform, height equal to nearly 

 half the length ; anterior extremity obtusely rounded, posterior 

 narrower, rounded ofi* obliquely ; dorsal margin forming a some- 



* These duplicatures occur also on the right valve hut are much less conspicuous. 



