1921] Schmitt: The Marine Decapod Crustacea of California 83 
vi. Antero-internal angle of antennal scale not produced, 
the spine reaching much beyond the blade. Hands 
of first pair of feet two and one-half to three 
times as long as wide; anterior margin, against 
which dactylus closes, oblique, forming an angle of 
about 45° with lengthwise margins. 
alaskensis elongata, p. 88. 
b. Sixth segment of abdomen not suleate, convex beneath. 
i. Hands very stout, only two and one-quarter times as long as 
wide; anterior margin more longitudinal than transverse. 
Antepenultimate segment of outer maxillipeds greatly 
dilated. 
alba, p. 89. 
ii. Hands elongate, about three times as long as wide, anterior 
margin more longitudinal than transverse. Antepenulti- 
mate segment of outer maxillipeds not dilated. (Not 
known north of San Pedro.) 
holmesi, p. 90. 
2. Carapace with two median spines. 
a. Rostrum slightly ascending, rounded at the tip; not exceeding the 
eyes. Abdominal sulci filled with a thin, short pubescence, 
easily rubbed off. Hands over three times as long as their 
average width; anterior margin obliquely transverse. Second 
segment of antennular peduncle twice as long as third. An- 
tennal scale about two-thirds length of carapace. 
communis, p. 95. 
b. Rostrum ascending at an angle of 45°; tip pointed, usually 
exceeding the eyes. Abdominal sulci without pubescence. 
Hands shorter than preceding species, about three times as 
long as wide; anterior margin more longitudinal. 
i, Eyes of moderate size. Second segment of antennular peduncle 
about three times as long as third. Antennal scale about 
four-fifths as long as the carapace exclusive of the ros- 
trum. (Not known north of San Francisco.) 
resima, p. 96. 
li. Eyes very large. Second segment of antennular peduncle 
about one and one-half times as long as third. Antennal 
scale three-fourths as long as the carapace exclusive of 
the rostrum. (Known only from 685+ fathoms.) 
abyssorum, p. 97. 
II. Gastric region depressed below general level of the carapace. Antennal scale 
with spine shorter than the blade, except in C.-variabilis, in which the 
spine equals or exceeds the blade, and in C. lomae, in which the spine 
exceeds the blade. 
A. Second lateral carina of the carapace (counting from the middle) 
unarmed. 
1. First to fourth abdominal segments, inclusive, smooth. 
a. Anterior median spine of the carapace not advanced as far as 
the line of the orbits. Hands of first pair of legs oblong, 
narrowing a little distally, or presenting a slight constriction 
at the base of the spine, three times as long as wide. 
munita, p. 98. 
