226 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



The outer branch is a little narrower than the inner l)ranch and 

 rounded truncate/' 



3S. Genus ANILOCRA Leach.'' 



Body compact, rather stout. Head posteriorly produced in three 

 lobes, not at all immersed and not constricted at the base. 



Anterior margin of the tirst thoracic segment more or less distinctly 

 trisinuate. Posterior angles of the tirst thoracic segment most always 

 somewhat produced and prominent; those of the second, third, fourth, 

 fifth, and sixth segments not prominent; those of the seventh segment 

 prominent and produced. Anterior epimera almost reach or do not 

 reach by a very short distance the posterior angle of the segment; 

 the postei'ior epimera do not reach b}" a greater or less distance the 

 posterior angle of the segment. 



Abdomen covered at the base. Legs increase graduall}' in length, 

 the last pair very often abruptly longer than the others. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS ANILOCRA. 



a. Head produced, with sides sinuate and roundly truncate in front. Terminal 

 abdominal segment varying in width, either etjually as long as wide or mani- 

 festly longer than wide. Uropoda much shorter than caudal segment; inner 

 branch scarcely much longer and much wider than outer branch. 



Anilocra latlcauda Milne Edwards 

 a'. Head rounded as a circle in front. Terminal abdominal segment wider than 

 long. Uropoda manifestly longer than terminal segment; inner branch much 

 shorter and scarcely wider than outer branch. 



Anilocra plebeiu Schio-dte and Meinert 



« The above description is from a dried specimen, the type, in the collection of the 

 Philadelphia Academy. Say's description is as follows: 



Body oblong-oval; head broader than long; tail dilated, lanceolate, carinate, equal 

 to the six preceding segments conjunctly. 



Inhabits — 



Cabinet of the Academy. 



Body, the transverse less than half of the longitudinal diameter; .segments nar- 

 rower t)efore and rounded, acute behind; edge not thickened; antennw not robust; 

 abdomen, segments suddenly narrower than the thoracic segments, subequal, the 

 posterior ones gradually narrower; terminal segment dilated, lanceolate, a transverse 

 impressed line at base, longitudinally carinated, carina obsolete toward the base, 

 inner terminal joint of the lateral appendices triangular, outer one linear somewhat 

 obliquely truncated at tip. 



Length, three-fourths of an inch. Found cast on the Ijeach of Cumberland Island, 

 Georgia.— Say, Journ. Acad. Nat. Sci. Phila., I, 1818, pp. 397-398. 



''See Schicedte and Meinert for characters of genus, Nat. Tidsskr. (3), XIII, 

 1881-83, pp. 100-101, 



