1921] Schmitt: The Marine Decapod Crustacea of California 241 
Key TO THE CALIFORNIA SPECIES OF LOPHOPANOPEUS 
I. Hands smooth, without lobes or teeth on upper margin; dark color of fingers 
does not run back on the palm. 
bellus, p. 241. 
II. Hands with one or more lobes or teeth on upper margin. 
A. Carpus of chelipeds smooth or nearly so. 
1. Color of fingers runs back on palm. (Not known north of Venice.) 
frontalis, p. 242. 
2. Color of fingers does not run back on palm. (Not known north of 
Monterey Bay. 
y Bay.) heathii, p. 243. 
B. Carpus of chelipeds very rough. 
1. Carpal joints of ambulatory legs strongly bilobed. Color of fingers 
does not run back on palm. 
a. Carpus of chelipeds with reticulating ridges enclosing pits of 
irregular shape. (Not known north of Monterey.) 
leucomanus, p. 243. 
b. Carpus of chelipeds covered with tubercles. (Not known north 
of Monterey Bay.) J . 
diegensis, p. 245. 
2. Carpal joints of ambulatory legs slightly bilobed. Carpus of cheli- 
peds is crossed by a few thickened ridges incompletely reticulat- 
ing, anterior margin having a thick, granulated ridge, distinctly 
separated by a deep sulcus from the rest of the carpus; a large 
granulated tubercle near articulation with hand; color of fingers 
does not run back on palm. (Not known north of Venice.) 
lockingtoni, p. 244. 
Lophopanopeus bellus (Stimpson) 
Plate 37, figure 4 
Xantho bella Stimpson, Ann. Lye. Nat. Hist. N. Y., 7, 204, pl. 5, fig. 2, 
1860 (1862). 
Lophoxanthus bellus A. Milne Edwards, Crust. Rég. Mex., p. 257, pl. 46, 
fig. 4, 1879 (part) ; Holmes, Occas. Papers Calif. Acad. Sci., 7, 60, pl. 1, 
fir. 3, 1900. 
Lophopanopeus bellus Rathbun, H. A. E., 10, 180, 1904; Weymouth, Stan- 
ford Univ. Publ., Univ. Ser., no. 4, 51, pl. 12, fig. 37, 1910. 
Fig. 143. Lophovanopeus bellus, carapace (after Holmes). 
Characters.—Carapace is roughened anterolaterally but not conspicuously so; 
frontal lobes are slightly sinuous and oblique, the outer tooth faintly indicated. 
Carpus of chelipeds is slightly roughened in the older specimens, but it often 
is roughly tuberculous in young ones; hand smooth, without a tooth on the upper 
