KANSAS ACADEMY OF SCIENCE. 73 



the posterior third of the first body segment. Second antennae and mouth 

 parts composed of short and wide joints. Labrum with eight teeth. First 

 and second maxillipeds bearing a transverse row of setiB on the second joint T 

 the second bearing also a cluster of three or four similar setae on the basal 

 joint. The apical joints of the posterior swimming-feet, as compared with 

 those of the anterior, are much less narrowed than is usual in Cyclops. The 

 swimming-feet have, in addition to the ordinary armature of setse and spines, 

 a closely set row of much smaller spines along the outer side of each ramus. 

 Their ordinary armature I have not yet ascertained in detail. 



The fifth foot is a simple flange-like process of the inflected border of the 

 fifth body segment. It has three obtuse angles, which are truncated for the 

 reception of the three stout, subequal setse. Of these setse, the innermost is 

 plumed on all sides with short, stout cilia, the second with slenderer cilia, 

 while the outermost is nearly or quite plain. A line of distinct serrulations 

 extends from one fifth foot to the other. 



Color, dirty-white. 



Length, exclusive of caudal setse, 1.15 mm. 



Allied to C. phaleratus, Koch, from which it differs in the number of joints 

 in the first antennae, and in some of the details of its armature. The sev- 

 enth joint of the first antennae of the present species corresponds with the 

 seventh and eighth of phaleratus. 



This species is abundant in Glacialis Pond, Cambridge. It is easily recog- 

 nized by the peculiar habit, which it shares with phaleratus, of leaving the 

 drop of water in which it may have been placed, and nervously hitching 

 itself along on the dry glass, where it will remain and perish by drying, if 

 not rescued. 



POGGENPOL's new species of CYCLOPS. 



Cyclops simplex."^ The length of the body, as far as the tail setae, is 1.5 

 mm. The antennae of the first pair are seventeen-jointed, and extend to the 

 third thoracic segment. The body is of an oval form, somewhat pointed 

 posteriorly. The abdominal segments, except the first, are one and a half 

 times as long as broad. These segments are almost square. The furca is 

 somewhat longer than the last abdominal segment. The three terminal seg- 

 ments of the first pair of antennae are but little longer than the preceding 

 ones; the longest and thickest basal segment is provided with six to eight 

 heavy bristles ; it has no hair nor serrulations. The fourth and seventh seg- 

 ments are almost twice as long as the rest, and are furnished with several 

 bristles, while all the segments, beginning with the eighth, have each only 

 one bristle. The fifteenth and sixteenth segments are each provided with 



*The identification of Cyclops Leenivenhockii of Hoek with C. simplex of Poggenpol does not seem to 

 me to be warranted by the study of both text and plates of the two authors. The first antennae of 

 Leenivenhockii reach to the base of the abdomen, while those of simplex cover only the first two seg- 

 ments of the body. The basal joint of the fifth foot, also, is short and broad in the former, and long 

 and narrow in the latter. It is probable, too, that Poggenpol would have seen and mentioned a longi- 

 tudinal lidge on the first antennae of simplex, had one existed as in Leenivenhockii, since he describes 

 the joints of these antennae and their furniture at considerable length. 



