ISOPODS OF NORTH AMERICA. 99 



wide and posteriorly truncate or slightly emarginate. The outer 

 branch is about half as wide as the inner branch', and is furnished with 

 one long spine at its posterior extremity. The inner angle of the 

 peduncle extends about two-thirds the length of the terminal segment 

 of the abdomen. 



The first three pairs of legs are prehensile, the last four pairs ambu- 

 latory. The propodus of the first pair is armed with six spines, the 

 carpus with one, the merus with twelve long ones on the inferior mar- 

 gin and one at the outer distal angle of the exterior margin. In the 

 second and third pairs there are five spines on the propodus, four long 

 ones on the carpus, and nine long ones on the inferior margin of the 

 merus, with one long spine at the outer distal angle on the exterior 

 margin. 



CIROLANA POLITA (Stimpson). 



JEga polita STIMPSON, Smith. Cont. to Knowl., VI, 1853, p. 41. LUTKEN, Vidensk. 



Meddel., 1859, p. 77. VERRILL, Am. Jour. Sci. (3), V, 1873, p. 16. 

 Conilera polita HARGER, in Smith and Harger, Trans. Conn. Acad. Sci., Ill, 1874, 



pp. 3, 22. VERRILL, Am. Jour. Sci., VII, 1874, p. 411. 

 Cirolana polita HARGER, Proc. U. S. Nat. Mus., II, 1879, p. 161; Report U. S. 



Commissioner of Fish and Fisheries, Pt. 6, 1880, pp. 381-382. RICHARDSON, 



American Naturalist, XXXIV, 1900, p. 217; Proc. U. S. Nat. Mus., XXIII, 



1901, p. 514. 



Localities. Bay of Fundy; Cape Cod Bay; Salem, Massachusetts; 

 Georges Bank; east of Banquereau; off Long Beach, Grand Menan, 

 New Brunswick. 



Depth. 1-321 fathoms. Nature of bottom, coarse yellow sand; 

 soft sandy mud. 



Body narrow, elongate, about four times as long as wide, 4 mm. : 

 16 mm.; very convex, almost cylindrical. 



The head is a little wider than long, 2 mm. : 3 mm. ; its anterior 

 margin is rounded, and produced in a small median point. The eyes 

 are small, square, and composite, and situated in the antero-lateral 

 angles of the head. The first pair of antenna? have the first two 

 articles short and subequal; the third is twice as long as either of the 

 other two. The flagellum is composed of twelve articles. The first 

 pair of antennae extend to the end of the peduncle of the second pair 

 of antennae or to the antero-lateral angles of the first thoracic segment. 

 The second antennae have the first two articles short and subequal; 

 the third and fourth are subequal and each is as long as the first two 

 taken together; the fifth is narrower than the preceding articles, a 

 little more than half as wide, and is a little longer than the fourth. 

 The flagellum is composed of ten articles. a The second pair of antennae 

 extend to the middle of the first thoracic segment. The maxillipeds 

 are composed of seven articles. The mandibles have a palp of three 



a In all the specimens examined. 



