1921] Schmitt: The Marine Decapod Crustacea of California 203 
Fig. 125. Epialtus nuttallii, 2, X %4 (after Randall). 
Epialtus bituberculatus Milne Edwards 
Epialtus bituberculatus Milne Edwards, Hist. Nat. Crust., 1, 345, pl. 15, 
fig. 11, 1834; Rathbun, Bull. U. 8. Fish. Comm., 20, pt. 2, 60, 1900 
(IDOI) g lel, Jaks dt, al}, lye INOS 
Fig. 126. Epialtus bituberculatus, natural size (after Milne Edwards). 
Characters.—Carapace subpentagonal, with two tubercles on gastric region 
and two lateral teeth or lobes very variable in shape and relative size. In the 
typical form the lobes are separated by a shallow sinus, the carapace is distinctly 
wider at the posterior lobe; the rostrum is triangular, obtuse, and entire. In the 
varieties the width at the hepatic region may equal that at the branchial region, 
the anterior lobe is much more prominent, and may be either broad and obtuse 
or narrow and spiniform. Sometimes one lobe or both has a tubercle on its 
anterior margin. The rostrum varies in length and shape, and may be either 
triangular or oblong, entire or emarginate, sometimes constricted near the base. 
In the typical form the preocular teeth are obsolete but are present though small 
in some of the varieties; postocular tooth wanting. Abdomen of male with fourth. 
and fifth segments fused. Chelipeds variable; hand in typical form wide, of 
moderate length, widening slightly toward distal end; movable finger with a 
tooth near its base; in the varietal forms the hand may be cristate, widening 
rapidly toward the fingers. 
