240 University of California Publications in Zoology [Vol. 23 



the fusion of the two sides; anterolateral margin armed with eight or nine small 

 subacute teeth besides the postorbital; a small tenth tooth often occurs behind 

 the ninth; preorbital tooth distinct. Merus of maxillipeds obliquely truncated at 

 anterior end. Carpus of chelipeds rugose, and furnished with two blunt teeth at 

 antero-internal angle; hand rugose above, and rather long, with upper and lower 

 margins nearly parallel; fingers long, sulcate, not gaping. Ambulatory legs with 

 margins hairy; dactyls longer than the propodi, and terminating in nearly straight, 

 corneous claws. 



Dimensions. — Type, male: length 23.9 mm., width 31.8 mm. 



Color. — The general color in life is a dull reddish brown, showing traces of 

 purple at the posterior part of the carapace and still more strongly on the ambula- 

 tory legs and below, thus somewhat resembling Xanthias taylori; fingers of cheli- 

 peds black, with teeth along inner margins white. One young specimen shows the 

 tendency to white markings so common in the young of Lophopanopeus heathii 

 ("Weymouth). 



Type Locality. — San Diego, California. 



Distribution. — Monterey Bay, California, to Guadalupe and San Martin islands, 

 Lower California. 



Bemarks. — Frequent under stones between tides (Baker). 



Cycloxanthops rugosus Holmes 



Cycloxanthops rugosa Holmes, Occas. Papers Calif. Acad. Sci., 7, 59, 1900. 

 Cycloxanthops rugosus Eathbun, H. A. B., 10, 180, 1904. 



Original Description. — Carapace very uneven, granulated, and thickly covered 

 with small, circular pits. Postorbital tooth small; anterolateral teeth irregular. 

 Anterior portion of the subhepatic region prominently granulated and pitted and 

 not sharply separated from the strongly sloping anterior portion of the hepatic 

 area. Front shorter and more depressed than in novemdentatus. External max- 

 illipeds much as in the preceding species; merus pitted and granulated. Carpus 

 of the chelipeds strongly reticulated above; a prominent tooth at the antero- 

 internal angle, below which is a smaller tooth. Hands narrow, strongly reticu- 

 lated above and on the upper portion of the outer surface, the inner margin of 

 the upper side furnished with several irregular tubercles. Ambulatory legs much 

 as in novemdentatus but less hairy (Holmes). 



Type Locality. — San Diego, California. 



Bemarlcs. — This species has not been found since Holmes's original specimen 

 was taken and described (no measurements were given). Holmes says it is 

 ' ' easily distinguished by the conspicuous pits and prominent granulations of the 

 carapace. ' ' 



Genus Lophopanopeus Rathbun 



Carapace more or less hexagonal or subquadrate; front short, divided by a 

 closed or nearly closed fissure into two sinuous lobes ; orbits transverse ; post- 

 orbital tooth small, anterior half of anterolateral margin more or less straight, 

 furnished with a single low obscure tooth which is more or less coalesced with the 

 postorbital, posterior half of anterolateral margin nearly longitudinal and fur- 

 nished with three prominent, subequal teeth; fronto-orbital border half or more 

 than half the greatest width of the carapace. Ambulatory legs more or less 

 cristate. Abdomen of male five jointed. 



