ISOPODS OP NORTH AMERICA. 309 



' c. Sinus with teeth. 



d. Sinus with four or six teeth. 

 e. Sinus with six teeth. Medium tubercle at base of terminal segment 



double Cilicsra gilliana Richardson 



e / '. Sinus with four teeth. Medium tubercle at base of terminal segment 



single Cilicsea caudata (Say) 



d'. Sinus with three teeth Cilicsea sculpta (Holmes) 



c'. Sinus without teeth Cilicsea carinata Richardson 



CILIC^A LINGUICAUDA Richardson. 

 Cilicsea linguicauda RICHARDSON, Proc. U. S. Nat. Mus., XXIII, 1901, pp. 536-537. 



Locality. Cape Catoche, Yucatan. 



Depth. 24-25 fathoms. 



Head subtriangular in shape; frontal margin with a small median 

 point; eyes post-laterally situated. The first pair of antennae reach 

 the posterior margin of the first thoracic segment; the second pair 

 touch the fourth segment. 



The first segment of the thorax is a little longer than any of the 

 others, which are similar in size. The epimera are distinct from the 

 segments, and are produced into acute points, with the 

 exception of the last, which has the epimera quite rounded. 



The abdomen is composed of two segments, the first of 

 which gives indication of three coalesced segments, and 

 has a small tooth on each side on its post-lateral margin. FlG 33 4 - _ C j LI . 

 The last segment is swollen anteriorly, and bears three. CJ;A LINGUI- 

 low tubercles on this portion. The extremity of the ^,^. 

 abdomen is marked by a sinus, almost complete ly filled 

 by a single large tooth, which is posteriorly triangular and extends 

 beyond the lateral teeth formed by the sinus. This central tooth 

 bears a small, pointed tubercle near its base. The uropoda are slightly 

 incurved, and are somewhat longer than the abdomen. 



The color is a dull yellow. 



The lower part of each thoracic segment is densely granulated, as 

 well as the whole surface of the abdomen. The edges of the segments 

 and the uropoda are fringed with hairs. 



Type. Cat. No. 23908, U.S.N.M. 



CILICSEA GRANULOSA Richardson. 



Cilicsea granulosa RICHARDSON, Proc. U. S. Nat. Mus., XXI, 1899, p. 841; Ann. 

 Mag. Nat. Hist,, (7), IV, 1899, pp. 186-187. 



locality. Cerros Island, Lower California. 



Depth. -20 fathoms. 



Surface of body densely granulated; granules large and close 

 together. 



Head with anterior margin thickened, and produced in a small 

 median point, on either side of which the margin is lobed. Eyes 



