78 KANSAS ACADEMY OF SCIENCE. 



uone at all: a fact which again distinguishes this Cyclops from C. cantho- 

 earpoides, whose furca-branches are furnished with a number of teeth and 

 hairs. The tail bristles are thickly plumose, and only nearer to their roots are 

 observed spines, with which the bristles of G. canthocarpoides are covered 

 along its entire length. The front edge of the pigmental spot is convex, the 

 posterior concave. This species, and particularly its female, resembles at first 

 sight C. canthocarpoides, but is undoubtedly distinguished from it by the 

 marks pointed out above. 



G. igneus. Length of body .8 mm., very long and narrow. The first 

 antennie are ten-joiuted, and reach to the second thoracic segment. The first, 

 third, sixth and seventh segments are the longest, the fourth has a very long 

 and stout bristle by which this species is easily distinguished from the other 

 Gyclops of the same group. The three terminal segments are very short and 

 broad; and each, except the last, which has on the top six or seven bristles, 

 has two bristles. The second antennae are shorter than those of G. lascivus; 

 their terminal segment has no long bristle, but has quite a stout spine. There 

 are no teeth or hair on the segments. The segments of the body and of 

 the trunk are also without any furniture. The rudimentary foot is the same 

 as in G. longicaudaius ; i. e., it is a simple elevation of the fifth thoracic seg- 

 ment, on which are situated three simple spines, the middle one of which is 

 shortest. The first abdominal segment is scarcely longer than the following 

 ones. The fourth segment on the posterior edge has a row of spines ; the 

 furca is twice and a half as long as the last segment of the abdomen. Of the 

 tail-bristles, but two are long. The others are short. The long bristles are, 

 at the base, furnished with sparse hairs; but their ends are thickly plumose. 

 The front and side edges of the pigmental spot are concave, but the posterior 

 is convex. The lenses are remarkable for being exceedingly convex. The 

 whole body, particularly its front part, is full of orange-red, fat-globules; 

 but the real color of the Cijclops is yellow, 



C. Fischeri. Length of the male, 1 mm.; female," 1.2 mm. The first 

 antenuse are six-jointed and very short; they reach only to the posterior part 

 of the cephalothorax. Segments one and three are the longest, and are fur- 

 nished with a large number of short bristles. The sixth segment is somewhat 

 longer than the preceding ones. The male's last segment is very long, and 

 has the shape of a cone; on its very tip there are no bristles at all, but 

 instead a very large bristle, turned not forward but backward, is situated 

 on its lateral edge, on which are found several additional short bristles. The 

 antennse of both the first and second pair have no hair and no teeth. The 

 thoracic segments have very strongly projecting posterior edges. The fourth 

 segment has on each side a row of small hairs, and the fifth has long teeth 

 on its posterior edge. The rudiaientary foot consists of two stout bristles, 

 which are covered with short hair, and which are situated on the small ele- 

 vation of the fifth thoracic segment. The rudimentary foot of the female 

 consists of three bristles. All the abdominal segments are beset, on the pos- 



