KANSAS ACADEMY OF SCIENCE. 77 



the other eight segments (seven only in the female) made up the abdomen. 

 The anterior antennae are very short, and do not reach to the posterior edge 

 of the cephalothorax; the three terminal segments are shorter than the others, 

 but proportionately broader, and at their center, from right and left, are 

 fastened bristles, one on each side. The first, third, seventh and eighth seg- 

 ments are the longest and each has several bristles, while the other segments 

 have each only one or two bristles The eleventh has six or seven bristles. 

 The second antennis consist of four quite long segments, which have only 

 setae, but no hair or teeth. The segments of the body are destitute of furni- 

 ture. The third thoracic segment, as has already been said, gets suddenly 

 narrower, so that the preceding segment forms quite a projecting edge. The 

 rudimentary foot consists of one segment and three long, plain bristles. All 

 the bristles are fastened to small stump-like processes, but do not form a con- 

 tinuation of the segment itself, such as we saw in the case of C. ornatus. The 

 first abdominal segment is twice as long as those that follow it. The last 

 abdominal segment is furnished on the posterior edge with small teeth The 

 furca is equal in length to the two last abdominal segments, and has quite 

 short bristles. Two of these at the very end of the segment are so small that 

 they might rather be called spines, which even are not plumose; the other 

 bristles are furnished with sparse and quite stout hair; the largest bristle is 

 but a little longer than the furca itself 



Cyclops lascivus. Length of body without furca, 1.5 mm. The fore part 

 of the body is somewhat drawn out and pointed at the end. The segments 

 of the thorax are without projecting edges. The first antennae have ten seg- 

 ments. The first antennae of the female, both in the length and in the form 

 of the segments, resemble those of C. canthocarpoides, Fisch.; but the antennae 

 of the male are different, to wit: The C canthocarpoides has .the two terminal 

 segments longer than the rest, which are provided with bristles turned for- 

 ward, but this species has its last two segments almost twice as long as the 

 ■others, and their bristles are distributed in a very peculiar manner; the ter- 

 minal segment has a whole tuft of quite long bristles, in a direction perpen- 

 dicular to the longitudinal axis of the segment, and the tuft itself is not on 

 the top of the segment, but deviating somewhat from it. On the posterior 

 third of the segment there is a bristle turned forward; on the ninth segment 

 there are three bristles, one of which is turned forward and is situated on the 

 small projection of the segment, but the other two are turned backward. The 

 second antennae consist of very long segments, while the C. canthocarpoides 

 has short ones, which are furnished on the inner surface with groups of teeth. 

 Characteristic of the described species is the presence on the terminal seg- 

 ment of a long bristle which does not exist in C. canthocarpoides Fisch. The 

 mouth-parts of C lascivus, as it seems, are not materially different from those 

 of C. canthocarpoides. The rudimentary feet consist of three bristles, which 

 form an immediate continuation of the fifth thoracic segment. The posterior 

 edges of the abdominal segments are furnished with hairs, but the furca has 



