l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



C. anceps from Paraguay (Daday, 1905, 133-134) and from the East 

 Indies (Daday, 1906, 181). In regard to the Paraguay material he 

 says (Daday, 1905, 134) : "am unteren Maxillarfuss ist die sichel- 

 formige Kralle de vorletzten Gliedes sehr kraftig, nahe zur Basis 

 mit kurzen Zahnchen bewehrt." His figure, however, shows nothing 

 to compare with the teeth in C. dcntathnanus, and we may assume 

 that he refers to the minute teeth which are found on this segment in 

 other species of Cyclops. 



CYCLOPS PANAMENSIS, new species 



A slender, graceful species. The cephalothorax is oval, its length 

 comparing with its breadth as about 9 to 5. The length of the 

 abdomen exclusive of the furcal rami about equals the breadth of the 

 cephalothorax. The last cephalothoracic segment is armed on each 

 side with a prominent seta, and the margins have minute spines. 



The abdomen (pi. 4, fig. 1) is slender. The first segment is 

 enlarged at its anterior end, and somewhat exceeds in length the 

 two succeeding segments. The remaining segments of the abdomen 

 equal each other in length. 



The furcal rami are slender and are nearly equal to the combined 

 length of the two preceding segments. The lateral setae are situated 

 at the distal third of the furcse. Of the four terminal setae, the outer 

 and inner are weak and short, the inner being considerably shorter 

 and smaller than the outer. The longest of the terminal setae about 

 equals in length the combined length of the last three abdominal 

 segments and the furcse. 



The first antennae (pi. 4, fig. 3) are composed of eleven segments 

 and reach to about half the length of the second cephalothoracic seg- 

 ment. The segments have the customary armature of setae but have 

 no distinctive structures. 



The rami of the swimming feet are two-segmented. The spinous 

 armature of the terminal segments of the exopodites is represented 

 by the formula 3, 4, 4, 3. The first segments of the rami are armed 

 on the distal border by a row of minute spines. The membrane con- 

 necting the feet of the fourth pair is armed on each side with three 

 blunt spines. Plate 4, fig. 4, shows the fourth feet. 



The fifth feet (pi. 4, fig. 2) are one-segmented. This segment is 

 short and broad, its length only slightly exceeding its width. The 

 inner distal angle is prolonged into a fine needle-like spine ; this is 

 apparently a part of the segment, and is not separated by a joint. At 



