ISOPODS OF NORTH AMERICA. 



223 



All of the segnu'iits of tho atRloincn uve distinct. The .sixth or 

 tcnninal seo-ment is about as broad as long, 4 mm.: 4 mm. The seg- 

 ment is somewhat quadrate, with the post- 

 lateral angles obtusely rounded, and the pos- 

 terior mai'gin p]-oduced in a small, triangular 

 median point. The -uropoda arc longer than 

 the terminal abdominal segment. The outer 

 branch is longer than the inner branch, 3 

 nun.: 4 mm. Both branches are produced 

 to narrow, acute extremities, the outer 

 branch being also somewhat narrower at the 

 base than the inner branch. 



All the legs are prehensile, gra(Uially 

 increasing in lengtn, and tiM-minate in long, 

 curved dactyl i. 



There are two longitudinal bands or stripes 



of a yellow or light-brown color, extending 



the entire length of the body, one on either 



The other parts of the bod}^ are a dark 



Fig. 226.— Nerocila c.\lifornio.\ 

 ( After ScHiCEDTE AND Meinert). 

 ((, Laterai, view, b, Adui.t fe- 

 male. (Enlarged.) 



side of the median lint 

 p'reenish brown color. 



NEROCILA MUNDA Harger. 



Nerocila mnnda Harger, with Vkkiull, Report U. S. Commissioner of Fish and 

 Fisheries, 1873, Pt. 1, p. 571 (277); p. 459 (165), 571.— Harger, Proc. IT. S. 

 Nat. Mus., II, 1879, p. 161; Report U. S. Commissioner of Fish and Fish- 

 eries, 1880, Pt. 6, pp. 392-393, pi. x, fig. 65.— Richardson, American Natu- 

 ralist, XXXIV, 1900, p. 220; Proc. U. S. Nat. Mus., XXIII, 1901, p. 528. 



LocalUy. — Vinej^ard Sound, at Woods Hole. 



Found on dorsal fin of Ahitera schoejrfii. 



Body oblong-ovate, a little more than twice as long as wide, 6 

 mm. : i;> nun. 



Head large, sub-(iua(lrate, al^out as wide as long, 2 mm. : 2 mm., with 

 the posterior margin tri-lobate, the median lobe being the largest. 

 The anterior margin is somewhat triangulate, with apex obtusel}^ 

 rounded. The e3'es are small, round, composite, and situated in the 

 Y)<)st-lateral angles of the head. The first pair of antenna' are com- 

 posed of eight articles and extend to the middle of the first thoracic 

 segment. The second pair of antenna^ are composed of twelve articles 

 and extend one or two articles beyond the first antennte; the last four 

 articles are very slender and gradualh^ diminish in size and length. 

 The maxilliped has a ])alp of two articles. The palp of the mandibles 

 is composed of three articles. 



The thorax is broadest at the fifth and sixth segments. The first 

 and fifth segments ai'e longer than any of the others. The post- lateral 

 angles of the last three segments are acutely produced, and extend 



