PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



notch in center of which is a median process or lobe. Endopod 

 of uropod W(>11 d(>veloped, Exopod not capable of folding under 

 endopod. 



Exopod of third pleopod always two-jointed. 



Fourth and iiftli pleopods with endopods thick, fleshy, Avith trans- 

 verse folds; exopods two-jointed. 



Maxillipeda with the second, third, and fourth articles of the palp 

 produced into lobes. 



jSlouth parts in female metamorphosed. 



The tj^pe of the genus is Cymodoce trancaia Leach. 



CYMODOCE ORNATA, new species. 



Head large, nearly twice as broad as long, 3i mm.: 8 mm., rounded 

 anteriorly, with a small median point separating the antenna'. E3^es 

 round, post-laterally situated. The tirst pair of antenna? extend to the 

 posterior angle of the first thoracic segment; the flagellum is com- 

 posed of ten to eleven articles. The second pair of antenna? reach 

 fully to the posterior margin of the fourth thoracic 

 segment; the flagellum consists of from eighteen to 

 nineteen articles. 



The segments of the thorax are subequal in length, 

 the tirst being somewhat longer. The epimera are 

 posteriorly produced into very acute angles, gradually 

 becoming less acute, the last one being quite rounded. 

 Fig. 10.— cymodoce The first segment of the abdomen is composed of 



OKNATA. ABDO- ,. , i i«Ti1ijI i_ 



MENOFMALE. X oj. ^'^'^^^ coalcsced segments, mdicated by three suture 

 lines, the third of which forms a ridge in the center. 

 The sides of this segment are produced into rounded lobes, provided 

 with fine hairs, and overlap the terminal segment. Two small tubercles 

 on either side of the median line are situated on the posterior margin. 

 The terminal segment is thickly tuberculated. At the base are four 

 tubercles, situated in a transverse row. Below these are four others, 

 similarity situated, but farther apart, and difiering in size, the two 

 center ones being more prominent. Below this row, and placed in 

 the median line, is a small triangularly shaped prominence, in the 

 center of which is a tubercle. The posterior margin of this segment 

 has a quadrangular excavation, in which there is a central tooth which 

 does not extend beyond the lateral teeth formed b}- the excavation. 

 The entire margin is fringed with thick hairs. 



The uropods, which are about equal in length, extend considerably^ 

 beyond the extremity of the abdomen. The inner branch is rounded 

 on the inner post-lateral angle and ends in a spinelike process at the 

 outer post-lateral angle; the external one is lanceolate, with upper 

 inner surface very concave; the outer margins of both are fringed 

 with hairs. 



