1921] Schnutt: The Marine Decapod Crustacea of California 245 
Lophopanopeus diegensis Rathbun 
Plate 37, figure 5 
Lophopanopeus diegensis Rathbun, Amer. Nat., 34, 137, 1900; H. A. E., 10, 
184, pl. 9, fig. 3, 1904; Weymouth, Stanford Univ. Publ., Univ. Ser., 
no. 4, 52, pl. 12, fig. 39, 1910. 
Fig. 146. Lophopanopeus diegensis, 3, X 1% (from Rathbun). 
Characters.—Carapace with a few granulate lines on the anterolateral regions; 
frontal lobes slightly oblique and sinuous, outer tooth inconspicuous. (The front 
is deflexed so that its true edge does not show in the view figured.) Carpus of 
chelipeds with about thirty-five irregularly placed tubercles, some of them 
forming lines; hand bicarinate above, the inner carina having a small prominence 
at the proximal end; inner surface of hand with a few tubercles on upper part; 
outer surface with upper and proximal portion rough, with five granulated rugae; 
dark color of fingers not running back on palm. Carpal joints of ambulatory legs 
with two prominent, naked, truncate tubercles on the anterior margin, a character 
by which this species may at once be recognized; propodal joints with a slightly 
convex anterior margin. 
Dimensions.—Type, male: length 7.9 mm., width 11.4 mm., proportion of length 
to width 1:1.44; fronto-orbital width 6.6 mm., proportion of fronto-orbital width 
to width of carapace 1 : 1.37. 
Color.—In life dull brown or blackish, occasionally tinged with red but never 
conspicuously marked as in L. heathii (Weymouth). 
Type Localityx—San Diego, California. 
Distribution.—Monterey Bay to San Diego Bay, California, 10 to 31 fathoms 
(Rathbun). 
Genus Xanthias Rathbun 
Carapace transversely oval; front broad, bilobed; anterolateral border cut 
into three or four tuberculiform or even spinous lobes or teeth, fronto-orbital 
border considerably more than half the greatest width of the carapace. Ambula- 
tory legs devoid of a crest, but more or less spinous or granular on upper margin. 
Abdomen of male five-jointed. 
Key TO THE CALIFORNIA SPECIES OF XANTHIAS 
I. Movable fingers of chelae very long and curved abruptly downward. (Only 
one specimen known, from San Diego.) ; 
latimanus, p. 247. 
II. Movable fingers of chelae stout, not abruptly curved downward. (Not known 
north of Monterey.) : 
taylori, p. 246. 
