1921 ] Schmitt: The Marine Decapod Crustacea of California 145 



Description. — Median projection of front narrow, triangular, acute, about 

 twice as long as wide at the base and reaching well beyond the middle of the 

 narrow, lanceolate eye scales, i.e., to or nearly to their acutely pointed tips; 

 lateral projections of front but slightly in advance of the base of the median 

 projection, rounded; anterior portion of the carapace about as wide as long, or 

 a little less. Eye-stalks compressed, scarcely if at all widening distally; reaching 

 about to the middle of the terminal segment of the antennular peduncle when 

 extended, and falling a little short of the antennal peduncle but slightly exceeding 

 the antennal scale. Chelipeds not hairy, greater part of upper surface of large 

 hand discoidal, widest at level of the bases of the fingers, with raised, finely 

 incised, denticulate margins, which posteriorly separate discoidal face from a 

 narrow, transversely and longitudinally convex basal (proximal) portion that fills 

 in the angle which the upper surface makes with the wrist, or carpus ; granules 

 on upper face of carpus not confluent, distinct; the fingers are wide and flattened, 

 widest distal to articulation of movable finger, outer margins but continuations 

 of the denticulate raised outer margins of palm ; small hand narrow, rounded, 

 palm and fingers subequal, fingers slightly gaping. Dactyls of ambulatory legs 

 strongly compressed, spinulous above and below, and terminating in a long, 

 corneous claw. 



Dimensions. — Type, male (Cat. No. 53330, U. S. N. M.) : length over all 30 mm., 

 of carapace and rostrum 7.5 mm., of large hand 7.5 mm., of discoidal upper face 

 of hand 6 mm., width of same 5 mm. 



Type Locality. — Santa Catalina Island, California; taken by the Venice Marine 

 Biological Station near Catalina Harbor (station T 156). 



Distribution. — From Santa Catalina Island, and San Pedro to San Diego, 

 California, 10 to 30 fathoms. 



Remarks. — This species, though remarkably like P. discoidalis (Milne Ed- 

 wards) (see Milne Edwards and Bouvier, Mem. Mus. Comp. Zool., 14, 18, 76, 

 pi. vi, figs. 7-14) from the West Indian region, differs sufficiently to be considered 

 a distinct species. The rostriform median projection of the carapace of P. dis- 

 coidalis is broadly triangular, about as wide at the base as long, the denticulations 

 of the raised margins of the upper face of the large hand are less incised, rather 

 more crenulate than denticulate ; the granules on the carpus of the large cheliped 

 are more or less confluent, forming transverse scabrous lines or ridges rather than 

 rows of distinct granules. In many of the specimens of P. discoidalis the upper 

 face of the hand is as much as one and a-half times as long as wide, with the tip 

 of the immovable finger extending slightly beyond that of the movable one. A 

 number of specimens have broader, rounder hands, with subequal fingers, as have 

 all the specimens of P. holmesi which I have examined. 



Genus Parapagurus Smith 



Abdomen with paired appendages other than the uropods on the first and second 

 segments in the male only. External maxillipeds widely separated at base ; 

 exopodite of first pair of maxillipeds non-flagellate. Chelipeds dissimilar and 

 unequal, the right being vastly the larger. Fourth pair of legs subchelate. In 

 the female there is only one oviduct, which opens on the coxa of the third left 

 thoracic leg. 



