MR. LUBBOCK ON SOME FRESHWATER ENTOMOSTRACA. 201 
the above description are said to be a little longer than the lamellie, though in Claus's 
figure, with which also my specimens agree, they are almost exactly twice as long. 
٠ Common at Chiselhurst. 
Cycrors CnAvsi, n. sp. (P1. XXXI. figs. 12, 13,14.) Antenne primi paris septendecim- 
articulate, secundum cephalothoracis segmentum non superantes. Pedes quinti 
paris parvuli, trisetosi. Furca caudalis longa, setis longis. | 
The first cephalothoracic segment is longer than the four following. 
Female. The anterior antennze are seventeen-jointed, and the segments are of the usual 
proportions. The terminal segment (Pl. XXXI. fig. 13) has, as usual, seven terminal 
setze, one of which is quite short, five out of the six others are long and delicately plumose. 
At the centre of this segment, and on the posterior side, is the usual notch, with a short 
hair. The penultimate segment has three setee at the apex—one at the posterior side 
considerably longer than the segment, and two at the anterior side somewhat shorter 
than the segment. They do not differ much in length, but one is stouter than the other, 
and plumose. The antepenultimate segment has only two hairs, which correspond in 
form and position to the two larger ones of the following segment. The fourth segment 
has one long seta, which is not inserted on the posterior side, but is generally bent over 
in that direction, as so often happens with this hair in the Cyclopide. The whole organ 
reaches about to the end of the second cephalothoracic segment. 
. The second pair of antennze offer no special peculiarities. The three terminal segments 
are ciliated on the posterior side, and the basal segment bears, besides the usual long setose 
hair, a few very short and stout spines. On the anterior side the basal segment has two 
setze, the second one, the third nine, and the fourth seven. The whole organ is stouter 
than Claus's figure of that belonging to C. coronatus. 
The inner maxillary foot resembles Claus's figure of that in C. gigas (l. c. pl. 11. fig. 3). 
The terminal segment, however, has only three setze, of which one is very large, one very 
small, and the third intermediate both in size and position. The third segment is some- 
what shorter and stouter than in the figure given by Claus, and has two spines. 
The posterior legs of the female (Pl. XXXI. fig. 14) are two-jointed. The basal seg- 
ment bears one seta; the second has two, one of which is quite short, and has the form 
of a strong spine. The organ, therefore, most nearly resembles that of C. furcifer; but 
the terminal segment is more quadrangular, and the attachment of the long seta appears 
to vary slightly: sometimes the end of the segment was truncated, and the seta only 
oceupied a part of the termination, at others it tapered slightly, and the seta occupied 
the whole extremity. quem 
The shapes and relative sizes of the abdominal segments offer no special peculiarities ; 
the posterior margin of the last is serrated, but the other segments have plain margins. 
The caudal lamell:e (Pl. XXXI. fig. 12) are long, ciliated on the inner margin, 
and their length is between five and six times their breadth. The arrangement and 
proportions of the setz resemble those of C. gigas, as figured by Claus (7. c. pl. 11. 
fig. 5); but the external seta is situated rather nearer to the end of the lamella, and is 
attached in a notch, from which a ridge proceeds to the hinder end of the lamella. Of 
