198 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Both pairs of antennae, at least in female, short and subequal 

 in length, originating close together. 



Mouth parts adapted for piercing and sucking. 



Legs with basal and ischial joints slender. First pair gener- 

 ally much stronger than the succeeding ones, subchelate ; the two 

 succeeding pairs likewise subchelate but weaker; last four pairs 

 ambulatory. 



Pleopods chiefly branchial in character, first pair large and 

 more or less covering the others. Uropods with the outer ramus 

 extending upwards, so as to arch over the base of the telson. 



Cyathura carinata (Kroyer). 



1880. Anthura polita, Harger, Rep. U. S. Com. Fish, for 

 1878, p. 398, pi. II, figs. 6.8, 69. 



1886. Cyathura carinata, Norman and Stebbing, Trans. Zool. 

 Soc. London, vol. 12, pt. 4, p. 124. 



1905. Cyathura carinata, Richardson, Bull. U. S. Nat. Mus., 

 No. 54, p, 63. 



Body more than seven times as long as wide. Head slightly 

 broader than long and deeply excavated on each of the front 

 angles for the bases of the first antennae. 



Eyes small and lateral, distinct, situated on the outer side of 

 the anterior prolongations of the head. 



First antennae with first and second peduncular joints subequal 

 in length; third joint a little shorter than second; flagellum con- 

 sisting of a single very short joint half as long as the third joint; 

 second joint furnished on lateral aspect with a row of setae. 

 Second antennas with first joint short; second joint twice as long 

 as first; third joint half as long as second; fourth joint shorter 

 than third; fifth joint as long as third; flagellum very short, 

 made up of one or two segments tipped with setae. 



Mandibles with three-jointed palp. Maxillipeds with palp of 

 two joints. 



First thoracic segment the longest; second segment shorter 

 but somewhat broader than the first and subequal in length to the 

 third, fourth, and fifth segments ; sixth and seventh segments pro- 

 gressively shorter. Coxal plates long and narrow, extending the 

 whole length of the segments and not separated by distinct su- 

 tures. 



