1921 1 Schmitt: The Marine Decapod Crustacea of California 185 



Mediterranean region, but the carapace is more quadrilateral, much more pubescent, 

 and not so conspicuously and strongly granulated, being only finely and obscurely 

 granulated beneath its pubescence. 



In H. cuvicri the spines forming the lateral series on the branchial region 

 behind the superior hepatic spine are six to eight in number, diminishing poster- 

 iorly to mere granulations; the inferior hepatic spine is the larger; there is a 

 well defined median line of granulations containing two or three conspicuous 

 spiniform tubercles, extending between the inner pair of the anterior gastric 

 spines toward the rostrum, of which no counterpart exists in H. faxoni; also the 

 legs of R. cuvieri are more slender and less flattened, the merus of the fourth leg, 

 for example, measured on the flat, dorsally-turned side being almost seven times 

 as long as wide, while the same joint in H. faxoni is only about five and one-half 

 times as long as wide. 



This species apparently belongs to the subgenus Paromola Alcock (1901, p. 61), 

 but has a longer fifth leg than his definition admits ; to be included that portion 

 of Alcock 's characterization would have to be slightly changed. 



From the only other homolid of this subgenus on the west coast of America, 

 Homola (Paroviola) ratlibuni Porter (Rev. Chilena Hist. Nat., 12, 88, pi. viii, 

 1908), our species differs in having a more quadrilateral carapace and longer fifth 

 legs as compared with Prof. Porter's figure, which was unaccompanied by a 

 description owing to loss of the type by fire. 



Subtribe OXYSTOMATA 



Key to the California Families of the Oxystomata 



I. Abdomen hidden under thorax; antennae small; legs normal in size and 

 position. Carapace rounded and crab-like. 



A. Afferent openings to gill chambers lie in front of the chelipeds; maxilli- 



peds not completely closing buccal cavern, the palp always exposed. 

 (Not known north of the Farallones.) 



Calappidae, p. 190. 



B. Afferent openings to gill chambers lie on either side of mouth at base 



of third maxillipeds; maxillipeds not completely closing buccal 

 cavern, the palp hidden by triangular merus. (Not known north 

 of Mendocino County.) 



Leucosiidae, p. 187. 

 II. Abdomen not hidden under thorax; antennae large; last two pairs of legs 

 reduced in size and articulated higher than preceding pair, so as to lie on 

 dorsal surface of body, subprehensile, with hook-like end joints. Afferent 

 openings to gill chambers near bases of the chelipeds. Carapace short and 

 subcircular or more or less squarish. (Not known north of Santa Catalina 

 Island or possibly Monterey.) 



Dorippidae, p. 185. 



Family Dorlppidae 



Abdomen not hidden under thorax. Carapace short, subcircular, or more or 

 less squarish. Antennae large. Last two pairs of legs reduced in size and articu- 

 lated higher than preceding pair, so as to lie on dorsal surface of body, sub- 

 prehensile, with hook-like end joints. Afferent openings to gill chambers near 

 bases of the chelipeds. 



