ISOPODS OF NORTH AMERICA. 



261 



The first segment of the thorax is longest, being 2 mm. in length. 

 The second and third are subequal, each being 1 mm. long. The 



fourth, fifth, and sixth are subequal, 

 each being 1 mm. long. The seventh is 

 shortest, being only i mm. in length. 

 The head is partly immersed or set in the 

 first thoracic segment, the antero-lateral 

 angles of which extend to about the mid- 

 dle of the head. The epimera are dis- 

 tinctly separated on the last six segments. 

 They are narrow plates, which in the SBC- 



FIG. 271. LlVONECA CALIFORNICA 

 (AFTER SCHICEDTE AND MEINEKT). a, 



ADULT FEMALE, b, LATERAL VIEW OF 



THORAX. (BOTH ENLARGED.) 



ond and third segments do 

 not quite reach the post- 

 lateral angles of the seg- 

 ments. In the last four 

 the epimera extend the full 



length of the lateral margins of the segments. 

 The abdomen is not narrower than the last 

 thoracic segment. The first segment is partly 

 covered at the sides by the seventh thoracic 

 segment. The terminal segment is rounded 

 posteriorly ; it is 4 mm. wide and 3 mm. long. 

 The uropoda are not longer, but as long as the 

 terminal abdominal segment. The branches are 

 equal in length and width, are alike in shape, 

 terminating in rounded extremities. 



All the legs are prehensile, being furnished 

 with long, narrow, curved dactj'li. There is 

 no carina on the basis of any of the legs. 



bed 



FIG. 272. LlVONECA CALIFORNICA. a, MAXILLIPED. X 33. 



6, SECOND MAXILLA, x 33. c, FIRST MAXILLA, x 33. d, 



PALP OF MANDIBLE. X 33. 



FIG. 273. LlVONECA CALI- 

 FORNICA. SEVENTH LEG. 

 xlli. 



LlVONECA REDMANNI Leach. 



Livoneca redmanni LEACH, Diet. Sci. Nat., XII, 1818, p. 352. 



Livoneca desmarestii LEACH, Diet. Sci. Nat., XII, 1818, p. 352. 



Livoneca redmanni DESMAREST, Consid. Gn. Crust., 1825, p. 308. 



Livoneca desmarestii DESMAREST, Consid. Gen. Crust., 1825, p. 308. 



Livoneca redmanni MILNE EDWARDS, Hist. Nat. Crust., Ill, 1840, p. 261. 



Livoneca desmarestii MILXE EDWARDS, Hist. Nat. Crust., Ill, 1840, p. 261. 



Livoneca redmanni MILNE EDWARDS, Cuvier's Regne Anim., pi. LXVI, figs. 4-4a. 



Livoneca desmarestii MILNE EDWARDS, Cuvier's Regne Anim., pi. LXVI, figs. 3-3a. 



Livoneca redmanni SCHICEDTE and MEINERT, Naturh. Tidsskr. (3), XIV, 1883-84, 

 pp. 353-358, pi. xiv, figs. 6-12. RICHARDSON, American Naturalist, XXXIV, 

 1900, p. 221; Proc. U. S. Nat. Mus., XXIII, 1901, p. 531. 



