ISOPODS OF NORTH AMERICA. 



195 



rior margin of the segment. They are all crossed obliquely by faint 

 carinae. 



All six segments of the abdomen are distinct and visible. The first is 

 almost entirely covered in the middle by the seventh thoracic segment, 

 but is uncovered at the sides. The sixth or terminal segment is poste- 

 riorly rounded. The uropoda do not extend beyond the extremity of 

 the terminal segment. The outer branch is a little shorter and nar- 

 rower than the inner branch; both are 

 rounded at the posterior extremity a 



and furnished with spines. There 

 are also a few spines on the posterior 

 margin of the terminal segment of 

 the body. The peduncle of the uro- 

 poda extends about two-thirds the 

 length of the terminal abdominal 

 segment. 



The first three pairs of legs are 

 prehensile, the last four pairs ambu- 

 latory. The first pair of legs have 

 two spines on the propodus, the sec- 

 ond and third pairs have three; all 

 three anterior pairs of legs have 

 three spines on the raerus. The am- 

 bulatory legs are beset with spines. 



ROCINELA DUMERILII (Lucas). 



Acherusia duinertlii LUCAS, Expl. Sc. 



Alger., Zool., I, 1849, p. 79, pi. vn, 



fig. 3. 

 Acheruxia complanata GKUBE, Ins. Lussin 



Meeresf., 1864, p. 76. 

 Rocinela dumerilii SCHICEDTE and MEIN- 



ERT, Naturhistorisk Tidsskrift (3), 



XII, 1879-80, pp. 391-393, pi. xn, 



figs. 4-6. BOVALLIUS, Bihang till k. 



Sv. Vet.-akad. Handl., XI, 1886-87, 



No. 17, pp. 9-10. RICHARDSON, 



Proc. U. S. Nat. Mus., XXIII, 1901, 



p. 524. NORMAN, Ann. Mag. Nat. 



Hist, (7), XIV, 1904, p. 436. 



Localities. Off Habana, Cuba; also Mediterranean Sea; Adriatic 

 Sea; in the Atlantic Ocean, latitude 36 47' 7" north, longitude 14 

 V 2" west; Vasco de Gama Ft. "S. 75 E., 13i miles" (Stebbing). 



Depth. 230 fathoms. Nature of bottom, fine gray sand. 



Body oblong, ovate, twice as long as wide, 15 mm. : 30 mm. 



Head not quite twice as wide as long 4 mm. : 7 mm., somewhat tri- 

 angular in shape, with the front produced over the basal articles of 



FIG. 181. ROCINELA DUMERILII (AFTER 

 SCHICEDTE AND MEINERT). a, FRONTAL 



MARGIN WITH BOTH ANTENNAE AND FRONTAL 

 LAMINA OF ADULT FEMALE. 6, SAME OF 

 YOUNG FEMALE. C, ADULT FEMALE. rf, 

 YOUNG FEMALE. (ENLARGED.) 



