176 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



fifteen articles. The second antenna 1 extend to the posterior margin 

 of the first thoracic segment. The frontal lamina is large, conspicu- 

 ous, with the basal part ventrally placed, not anteriorly directed, and 

 somewhat quadrate in outline, with the anterior margin a little pro- 

 duced in the middle between the basal articles of the antennas. The 

 maxilliped has a palp of five articles. 



The first, fifth, and sixth segments of the thorax are a little longer 

 than any of the others. The epimera are distinct from the segments, 

 are narrow plates, with a distinct carina extending obliquely across 

 the surface. 



All six segments of the abdomen are distinct. The lateral parts are 

 not separated off from the dorsal portion of the segment. There is a 

 distinct carina extending from the posterior angle a short distance 

 across the lateral parts of the first five segments. The sixth or termi- 

 nal segment is broad, with its posterior extremity truncate, and about 

 half as wide as the basal part of the segment. The posterior margin 

 is denticulate. The uropoda are as long as the terminal segment. 

 The branches are equal in length. The inner one is about one and a 

 half times wider than the outer one, is posteriorly truncate, while the 

 outer one is rounded posteriorly; their posterior margins are faintly 

 crenulate. 



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

 latory. There is a linguiform process at the distal end of the propodus 

 of the second and third pairs of legs. On the carpus of these legs is 

 one small blunt spine, on the merus are five small blunt spines, and at 

 the distal end of the ischium are two small ones. 



JEGA LECONTII (Dana). 



JEgacylla lecontii DANA, Proc. Acad. Nat. Sci. Phila., VII, 1854, p. 177. STIMPSON, 

 Bost. Jour. Nat. Hist., VI, 1857, p. 509. RICHARDSON, Proc. U. S. Nat. Mus., 

 XXI, 1899, pp. 826-827; Ann. Mag. Nat. Hist. (7), IV, 1899, pp. 167-168; 

 American Naturalist, XXXIV, 1900, p. 218. 



Localities. California (Dana); Monterey Bay, California. 



Body elongate, oval; surf ace smooth; color yellow, with a few brown 

 dots; eyes reddish brown. 



Head with anterior margin bisinuated, the median point separating 

 the basal joints of the first pair of antennae and extending one-third the 

 length of these joints. Eyes large, oval, very close together at upper 

 inner angle. First pair of antennae with basal joints very large, dilated; 

 second joint of peduncle dilated, and with a process at the apex extend- 

 ing nearly the length of the third joint; third joint very narrow, about 

 one-third the width of two preceding joints; flagellum, composed of 

 seven joints, extends the length of the peduncle of second pair of 

 antennae. Second pair of antenna, with a flagellum of twelve joints, 

 extend almost to the posterior margin of the first thoracic segment. 



