510 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXIII. 



tinct, and very black. First pair of antennse more than twice as 

 long as the length of the head; flagelliim about seven- 

 teen jointed. Second pair of antenna somewhat longer 

 than first pair, with joints of flagellum stouter; flagel- 

 lum about twenty-three jointed. 



First six thoracic segments long and narrow; second 

 segment narrower posteriorly than anteriorly; last 

 segment very short, one-third shorter than preceding 

 segment. Abdomen with all the segments distinct. 

 Terminal segment long, linguate in shape, rounded 

 posteriorly with crenulate margin. Outer branch of 

 uropoda arching over telson, but not meeting in center; 

 narrow, elongated. Inner branch of uropoda extending 

 beyond telson, rounded posteriori}^ 

 and shorter than peduncular joint; 

 inner margin crenulate. Abdomen 

 about equal in length to fifth and sixth thoracic seg- 

 ments taken together. 



First pair of gnathopods large, subche- 

 late; second pair of gnathopods and first 

 pair of pereiopods subchelate, small. 

 Other pereiopods ambulatory, slender. 



One specimen (type) sent by Mr. F. Stearns to the 

 U. S. National Museum comes from between Nassau and 

 Andros Island, Bahamas. Another specimen was taken 

 by the U. S. Fish Commission steamer Albatross ofi' Cape 

 Catoche, Yucatan. 

 Type.— Cat. No. 23900, U.S.N.M. 



Fig. 2.— Calathura 



crentjlata. 



Fig. 3.— Abdomen. 



Fig. 4. — First 

 gnathopod. 



Family V. CIROLANIDiE. 



ANALYTICAL KEY TO THE GENERA OF CIROLANID.*:. 



a. No branchiee developed at the base of the pleopoda. Eyes situated on the superior 

 side and very often also on the mferior side of the head. 

 b. Peduncle of second antennae five jointed. Plate of second joint of maxillipeds 

 furnished with hooks. Uropoda with inner angle of peduncle produced. 

 c. First and second pairs of pleopoda equal in length with at least the inner 



branch sul)ineml)ranaceous 16. Virolana. 



L-' . First pair of pleopoda with both branches hard, and forming a large opercu- 

 lum; second pair of pleopoda sul^membranaceous 17. (A»ulera. 



¥. Peduncle of second antenna^ four jointed. Plate of second joint of maxillipeds 

 without hooks. Uropoda with inner angle of peduncle very little produced. 

 Pleopoda with both branches submembranaceous. Superior antennae with 

 first joint of peduncle quite short, and extended straight in front at a right 



angle to remaining part of the antenna 18. Eurydice. 



a'. Branchiae well developed at the base of the pleopoda. Eyes developed only on 

 the inferior side of the head 19. BaihynQiniis. 



