ISOPODS OF NORTH AMERICA. 105 



CIROLANA GRACILIS Hansen. 



Cirolana gradlis HANSEN, Vidensk. Selsk. Skr. (6), V, 1890, pp. 329-331, pi. n, 

 figs. 2-2g. RICHARDSON, Proc. U. S. Nat. Mus., XXIII, 1901, p. 513. 



Locality. St. Thomas, West Indies. 



Body more than three times longer than wide, somewhat convex. 



Front produced forward in a process a little wider and shorter than 

 in C. lorealis. 



Eyes large, brownish, seen from the side almost as wide as long, 

 with the superior margin short and straight; the ocelli are few and 

 large, rather convex on the superior side, somewhat convex on the 

 inferior side. 



The frontal lamina is very narrow, becoming narrower toward the 

 apex, with the lateral margins disappearing anteriorly but manifest 

 posteriorly. 



The clypeus is scarcely shorter than the labrum with the anterior, 

 posterior, and lateral margins elevated and with a median rib, enclosing 

 two impressed, reticulate areas. 



The first pair of antennae are a little stouter than in C. borealis, and 

 extend a little beyond the apex of the fourth article of the penduncle 

 of the second pair of antennae. 



The second pair of antennae reach the posterior margin of the fourth 

 thoracic segment; the. peduncle has the third article scarcely longer 

 than the fourth, and a little shorter than the fifth; the flagellum is com- 

 posed of about twenty-six articles. 



The mandibles and the maxillipeds are almost as in C. borealis. 



The thoracic segments are subequal in length; the first segment is 

 scarcely shorter than the head and a little longer than the fifth seg- 

 ment; the seventh segment is rather long. 



The epimera are a little narrower than in C. neglecta, otherwise 

 formed as in that species with furcae. 



The first three pairs of legs are formed almost as in C. fiorealis, 

 nevertheless they are somewhat more slender and furnished with a few 

 hairs and a few spines mostly longer. 



The last four pairs of legs are more slender than in C. borealis, and 

 are rather different from them. The fifth pair of legs are elongated, 

 are somewhat longer than the seventh pair of legs, and a little shorter 

 than the sixth pair of legs; the second article is formed as in C. borealis 

 with simple hairs arranged in three series; the other articles are some- 

 what more slender than in C. borealis and ornamented with hairs and 

 a few spines; the fourth article is rather dilated; the fifth article is 

 quite dilated and furnished everywhere on the superior side with a 

 few spines. The fourth pair of legs are rather short. The seventh 

 pair of legs are rather different; the second article is flattened and 



