64 CALIFORNIA ACADEMY OF SCIENCES. 



Lophoxanthus frontalis (Rathbun). 



Lophozozymus (Lophoxanthus) frontalis Rathbun M., Proc. U. S. Nat. 



Mus., Vol. XVI, 1893, p. 236. 

 Lophopanopeus frontalis Rathbun M., Bull. Lab. Nat. Hist., Univ, Iowa, 



1898, p. 272. 



Closely allied to the two preceding species, especially to leucomanus. 

 The shape of the carapace is nearly the same as in the preceding species, 

 but the upper surface is smoother, not eroded, the lateral teeth more flat- 

 tened horizontally and slightly upturned; the areolation is plain; the 

 subhepatic regions are granulated but not eroded. Front considerably 

 produced, sinuate, the median notch deep. Orbits and orbital teeth as in 

 leucomanus. Maxillipeds granulated, the merus shaped as in the two pre- 

 ceding species, and crossed by an oblique elevation. Chelipeds unequal; 

 merus with a few teeth, on the upper margin; carpus rugose or nearly 

 smooth, with a tooth at the-inner angle and a tubercle at the base on the 

 upper side; hands large, with a lobe pointing inward at the base of the 

 upper side of the palm; fingers brown, the color extending far back on 

 the hand. Legs rather slender, more or less hairy, the upper edge of the 

 merus acute but having no well-marked tooth near the end; crests of the 

 carpus and propodus as in leucomanus but less prominent; dactyls slender. 



Length of carapace 15 mm.; width 20 mm.; length of larger hand 16 mm. 



Described from a specimen from San Diego sent by 

 Miss Rathbun (No. 19823, U. S. National Museum). 



San Diego (Rathbun)! Monterey (Rathbun). 



This species may readily be distinguished from hellus 

 by its different shape; the portion of the carapace lying 

 in front of a line connecting the tips of the first lateral 

 teeth is about one-fourth the length of the whole cara- 

 pace in hellus, and about one-third of this length in 

 leucomanus and frontalis. The color of the fingers 

 extends far back upon the hands in this species, while 

 in both the preceding it does not extend further back 

 than the base of the fingers. The front is much more 

 produced than in hellus. The hands and carpal joints 

 of the chelipeds are, like the carapace, much less eroded 

 than in leucomanus, and the merus of the maxillipeds 

 has the oblique ridge low and flattened and not raised 

 into a tubercle in the center. 



