| OCR Text |
Show 126 DR. G. STEWARDSON BRADY ON [May 17, and less distinctly rounded 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-fourths 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 setae 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 insufficient to give it separate generic rank. S t e xoc ypr is p e r a rm a t a , n. sp. (Plate VIII. figs. 50-57.) Shell, 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 ai'cuate, sloping evenly toward the front, more abruptly and with a slight sinuosity behind, ventral slightly sinuated near the front 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 setiferous at the extremities; structure thin and membranaceous +. 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 ; maxillae (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; postabdominal 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 Cyprididae. * The second foot of Cypris ornata, a rare British species, is very similar to this, and is figured in Plate V I I . fig. 39. f 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 structures. |
