ISOPODS OF NORTH AMERICA. 



195 



by faint 



lie Hi-st is 

 ■^('t^niont, 

 is poste- 

 (Miiity of 

 and liar- 



.^^^^K 



rior margin of the segment. They are all crossed obliquely 

 carina'. 



All six segments of the abdomen are distinct and visilile. T 

 almost entirely covered in the middle by the scn'enth thoracic ; 

 l)ut is unco\ ered at the sides. The sixth or terminal segment 

 liorly rounded. The uropoda do not extend beyond the cxti 

 the terminal segment. The outer branch is a little shortei- 

 rower than the inner ])ranch; both are 

 rounded at the posterior exti'emity 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 i)airs have three; all 

 three anterior paii's of legs have 

 three spines on tlie merus. The am- 

 bulatory legs are beset with spines. 



ROCINELA DUMERILII (Lucas). 



Acfirrusia (liuiicr'dil Lucas, Expl. Sc. 



Al^n'T., Zool., 1, 1849, p. 7!), pi. vii, 



fiK- :^. 

 Aclwrnsid covipldnadi Gkuuk, Ins. Lussin 



Meeresf., 1864, p. 76. 

 Rociriela dumeriln SchiU':dte and Mein- 



ERT, Naturhistorisk Tidsskrift (.3), 



XII, 1879-80, pp. 391-398, pi. xii, 



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. 



LocaJltiex. — Ofi' Habana, Cul)a; also Mediterranean Sea; Adriatic 

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

 7' 2" west; Vasco de Gama Pt. "S. 75'- E., 13i miles'' (Stebbing). 



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



Body ofdong. ovate, twice as long as wid(\ In mm. : 30 mm. 



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

 angular in shai)e, with the front produced over the l)asal articles of 



Fig. 181.— Rocinei-a dumerii.Ii (After 



SCHICEDTE AND MEINERT). a, FRONTAL 

 riARGIN WITH BOTH ANTENN.KAND FRONTAL 

 LAMINA OF ADULT FEMALE, h, SAME OF 

 YOVNG FEMALE. r, ADTLT FEMALE. d. 



Young female. (Enlarged.) 



