218 University of California Publications in Zoology (Vou. 23 
B. Front not markedly produced beyond outer orbital angles, formed of 
five unequal teeth; outer teeth larger and more widely separated 
from the three median teeth than these are from each other. 
1. Carapace widest at tenth anterolateral tooth; posterolateral margin 
behind it entire, without teeth; anterolateral teeth with more or 
less prominent serrations anteriorly. Fingers of chelipeds with- 
out dark color. 
“magister, p. 229. 
2. Carapace widest at ninth (sometimes eighth) anterolateral tooth; 
always with at least a rudimentary tenth and sometimes an 
eleventh tooth behind it on the posterolateral margin. 
a. Anterolateral teeth low, projecting less than one-third the length 
of base, not spiny-pointed. Fingers of chelipeds without 
dark color. Merus of outer maxillipeds elongated, rounded 
anteriorly. (These characters, except those of the fingers of 
the chelipeds, do not hold in very small specimens, for which 
see key on p. 219.) 
gracilis, p. 232. 
b. Anterolateral teeth not low, projecting more than one-third the 
length of base, often spiny-pointed. Fingers of chelipeds 
dark-tipped. Merus of outer maxillipeds not elongated, trun- , 
eated anteriorly. 
i. Carpus of cheliped with two spines, one above at distal end 
and a second below this on inner angle; hand roughened 
and armed above with two or more spines, sometimes 
inconspicuous. 
a. Anterolateral teeth acute, strongly produced, alternately 
large and small; carapace pubescent. 
i. Tenth anterolateral tooth conspicuous, eleventh present ; 
daetyl of cheliped spiny. Carapace strongly areo- 
lated. 
gibbosulus, p. 226. 
ui. Tenth anterolateral tooth inconspicuous, eleventh not 
present; dactyl of cheliped not spiny. Carapace 
slightly areolated. (Not known north of Half Moon 
Bay.) 
jordam, p. 228. 
b. Anterolateral teeth broadly triangular, not strongly pro- 
duced, subequal. Carapace strongly areolated, not 
pubescent. (Not known north of San Diego.) 
amphioetus, p. 223. 
ii. Carpus of cheliped with a single spine above at distal end; 
hand smooth or granulated, without spines. 
a. Carapace widest at eighth anterolateral tooth, eleventh dis- 
tinct; under parts spotted or blotched with reddish. 
antennarius, p. 224. 
b. Carapace widest at ninth anterolateral tooth, tenth incon- 
spicuous; under parts of uniform light color. (Not 
known north of Long Beach.) 
anthonyi, p. 227. 
ee 
