130 
BRITISH ENTOMOSTRACA. 
which is quite transparent, a good deal of resemblance 
to a harp. Beak rounded and obtuse. 
Eye areolar ; accompanying black spot nearly half the 
size of the eye, and rather square-shaped. 
Superior antennae of considerable length, the termina- 
ting setae being much longer than in the other genera. 
Inferior antennae or rami slender, and of considerable 
length, each branch provided with three long setae from 
the e xtremity of last articulation only . 
The rami and setae together extend almost the length 
of the shell, reaching nearly to its inferior extremity. 
The upper part of the body of the animal is very 
rounded, and crenated on the outer edge. 
Abdomen slender, not serrated on under margin, but 
marked near the edge with a row of indentations, and 
terminating in two claws, which are long and slender. 
First pair of feet large. 
Intestine convoluted, having one turn, and nearly half 
another. 
Hab . — Pond in Osterly Park ; ditch near Bichmond ; 
pond on Bowmont Water, Yetholm, Roxburghshire; 
™ 1 10 ' T 11 ‘ q. Summer months. 
2. Acroperus nanus. Tab. XYI, fig. 6. 
Acroperus nanus, Baird, Ann. and Mag. Nat. Hist., ii, 92, t. 3, f. 8, 
1843 ; Trans. Berw. Nat. Club, ii, 151. 
Somewhat resembles the last in shape, but is very 
small, not the seventh part the size ; is less transparent, 
less deeply sinuated on anterior margin, and less pro- 
jecting at lower extremity. 
The striae or ribs are not so large, and are disposed 
in a waved form , obli quely transverse : anterior margin 
ciliated. 
Beak rather long, sharper than in the preceding species. 
Inferior antennae or rami slender, and rather shorter 
