206 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FlG. 202. ROCINELA LATICAUDA. tt, MAXILLIPED. 



x 27j. b, LEG OF SECOND PAIR, x 9j. 



dus armed with live spines in the larger specimen, six in the smaller 

 specimen, the merus with four spines. The four following pairs of 



legs are ambulatory and are 

 thickly beset with spines/' 



ROCINELA ANGUSTATA Rich- 

 ardson. 



RocinelalaticaiK/d RICIIAKDSON (not 

 Hansen), Proc. Am. Philos. 

 Soc., XXXVII, 1898, pp. 14- 

 15, figs. 5-6; Proc. U. S. Nat. 

 Mus., XXI, 1899, p. 828 (part) ; 

 Proc. U. S. Nat, Mus., XXVII, 

 1904, p. 33; Bull. T. S. Fish 

 Comm., XXIV, 1905, p. 214. 



Localities. Oft San Luis Obis- 

 po Ba} T , California; oft Esteros 

 Bay, California; Puget Sound, 

 Washington; Unimak Island, Alaska; Japan; Eastern Passage (vicinity 

 of Stikine River Delta), southeastern Alaska; vicinity of Yes Bay, Behm 

 Canal. 



Depth. 67-252 fathoms. 



Head, with a median projection, long and broad, 

 extending slightly downward and having a blunt 

 extremity. Eyes large, with ten rows of ocelli. 

 The first antenna, with a flagellum composed of 

 six articles, reaches the posterior margin of the 

 head. The second antenna extends to the middle 

 of the second thoracic segment; its flagellum con- 

 sists of fifteen articles. 



The thoracic segments are equal in length. The first is deeply 

 bisinuated, its antero-lateral angles extending along the side of the 

 head to about the middle of the eyes. The epimera of the second, 

 third, and fourth segments are rounded 

 posteriorly; those of the remaining seg- 

 ments have pointed extremities. 



The first segment of the abdomen is 

 almost entirely covered by the last tho 

 racic segment. The fifth segment, as 

 well as this one, is narrower than the 

 intervening segments, and not as broad 

 as the base of the terminal segment. 

 The last segment is 9 mm. wide and 7 



mm. long, widely rounded posteriorly, and is fringed with rough hairs, 

 which almost conceal its crenulated margin; at the base it is impressed 



FIG. 203. ROCINELA AN- 

 GUSTATA. HEAD, x 2!. 



PIG. 204. ROCINELA ANGUSTATA. HEAD 

 WITH ANTENN.K AND FIRST TWO SEG- 

 MENTS OF THOEAX. X 1$. (FROM 

 JAPAN.) 



The measurements are of the larger specimen, 

 the smaller specimen. 



The drawings arc made from 



