1921] Schmitt: The Marine Decapod Crustacea of California 267 
Remarks.— 
‘Related to P. tubicola, schmitti, and hiatus, all of which have smooth carapaces, 
swollen palms, and nearly straight dactyli of the legs; weymouthi is narrower, 
its sides truncated, and antero-lateral angle more prominent. The male abdomen 
of tubicola is more triangular, that of schmitti has more convex margins than in 
weymouthi (Rathbun). 
Genus Scleroplax Rathbun 
Carapace transverse, hard. Outer maxillipeds with ischium rudimentary; 
merus longer than broad, oblique, not curved, winged on the margins; palp three- 
jointed; last jot articulated near the proximal end of the inner margin of the 
preceding one. Ambulatory legs similar in character, slender; third pair the 
longest, but slightly exceeding the others. 
Scleroplax granulata Rathbun 
Plate 44, figures 1, 2, and 3 
Scleroplax granulata Rathbun, Proc. U. 8. Nat. Mus., 16, 251, 1893. 
Pinnixa (Scleroplax) granulata Holmes, Oceas. Papers Calif. Acad. Sci., 
7, 94, 1900. 
Scleroplax granulata Rathbun, H. A. E., 10, 188, pl. 7, fig. 5, 1904; Wey- 
mouth, Stanford Univ. Publ., Univ. Ser., no. 4, 59, text fig. 8, 1910; 
Way, Puget Sd. Mar. Sta. Publ., 1, 362, fig. 15, 1917; Rathbun, Bull. 
Ue SoeNate Mus wOV etext te. lOOS pL sod iosael—o lols. 
Characters.—Carapace subpentagonal, hard, granulate anteriorly and near the 
margins, punctate elsewhere; a granulated ridge defines the lateral margin; front 
narrow, produced, slightly convex as seen from above; orbits nearly circular, 
eye-stalks very short and thick; antennules almost transverse. Ambulatory legs 
slender, granulate, the third pair longest, the second longer than the first, the 
first pair weakest; the joints narrow, flattened; the dactyls very slender, almost 
straight, and equal the propodal joints in length. Abdomen of male narrow, 
tapering very gradually to the broad terminal segment; third, fourth, and fifth 
segments partially anchylosed; abdomen of female very smooth and shining, 
fringed with hair, not reaching beyond the sternum. 
Dimensions—Type, female: length of carapace 6 mm., width 8 mm. 
Color.—Grayish white, very much darker after moultings (Way). 
Type Locality.—Ensenada, Lower California. 
Distribution.—Puget Sound, to Ensenada, Lower California (Rathbun). 
Remarks.—Has been taken from the shell of Mya (Rathbun). 
Biological Survey of San Francisco Bay.—Only one specimen of 
Scleroplax granulata was taken and that in the middle bay (D 5775) 
in company with Crago munitella, in 4 to 7 fathoms. The bottom was 
composed of ‘‘large and small angular rock fragments ;’’ annual mean 
temperature 12.01° C, range 8.7° to 14.3° C; salinity, mean 31.04, 
range 26.6 to 33.3. 
