126 DR. G. STEWARDSON BRADY ON [May 17, 



and less distinctly i^ounded off; dorsal margin boldly arched, 

 sloping more steeply behind than in front, ventral feebly convex, 

 with no trace of sinuation : seen from above (fig. 35) the outline 

 is very broadly ovate, widest in the middle, width equal to nearly 

 three-fouiths of the length, extremities obtusely pointed, the left 

 valve larger and overlapping the right both in front and behind. 

 Surface of the shell marked throughout with delicate and closely- 

 set longitudinal furrows and bearing scattered hairs of variable 

 length. Colour dusky greenish grey. Length 1-0 mm. 



The antennae bear fascicles of setse reaching to the extremity of 

 the claws, exactly as in the preceding species ; second pair of feet 

 with a slender terminal claw (figs. 36, 37), one long seta and 

 several small claw-like processes * ; post-abdominal rami (fig. 38) 

 extremely slender, bearing two apical setae and one much smaller 

 lateral seta situated not very far from the apex. 



The armature of the second pair of feet is here very different 

 from that of a typical Cypris, but this character seems insufiicient 

 to give it separate generic rank. 



Stenocypris perarmata, n. sp. (Plate VIII. figs. 50-57.) 

 SheU, seen from the side (fig. 50), elongated, siliquose, greatest 

 height equal to rather more than one-third of the length and 

 situated in the middle ; anterior extremity evenly rounded, posterior 

 suddenly tapered, narrow and rounded off below ; dorsal margin 

 arcuate, sloping evenly toward the front, more abruptly and with 

 a slight sinuosity behind, ventral slightly sinuated near the fi'ont 

 but having a longer, shallow sinuation in the middle : seen from 

 above (fig. 51) the outline is extremely compressed and elongated, 

 quite four times as long as broad, obtusely pointed in front, 

 acuminate behind. Surface smooth, slightly seti^Ferous at the 

 extremities ; structure thin and membranaceous f. Length 

 1"6 mm. 



Antepenultimate joint of the antennas (fig. 52) bearing a small 

 fascicle of setae, two of which are longer than the rest, reaching 

 beyond the bases of the terminal claws ; mandibles (fig. 53) of the 

 usual form, the biting portion armed with numerous strong teeth ; 

 maxillte (fig. 54) having four slender, elongated lobes, two of the 

 claws of the second lobe strongly denticulate (fig. 55) ; terminal 

 claw of the first foot very long and slender, second foot (fig. 56) 

 bearing a falcate terminal claw and a very long seta; post- 

 abdominal rami (fig. 57) slender, bearing two long, strongly 

 pectinated terminal claws and one very slender seta, and on the 

 dorsal margin towards the apex armed with a series of about nine 

 or ten strong spines with smaller setae in the intervals ; genital 

 lobes very similar to those of Herpetocypris and other partheno- 

 genetic Oyprididae. 



* The second foot of Cypris ornafa, a rare British species, is very similar to this, 

 and is figured in Plate VII. fig. 39. . j. 



t The specimens, as I received them, had been for a length of time in a formalin 

 preservative, which may perhaps have led to the disappearance of calcareous 

 structui'es. 



