1921 ] Schmitt: The Marine Decapod Crustacea of California 267 



Remarks. — 



Belated to P. tubicola, schmitti, and hiatus, all of which have smooth carapaces, 

 swollen palms, and nearly straight daetyli 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 (Eathbun). 



Genus Scleroplax Eathbun 



Carapace transverse, hard. Outer maxillipeds with ischium rudimentary; 

 merus longer than broad, oblique, not curved, winged on the margins; palp three- 

 jointed; last joint 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 Eathbun, Proc. TJ. S. Nat. Mus., 16, 251, 1893. 

 Pinnixa (Scleroplax) granulata Holmes, Occas. Papers Calif. Acad. Sci., 



7, 94, 1900. 

 Scleroplax granulata Eathbun, H. A. E., 10, 188, pi. 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; Eathbun, Bull. 

 U. S. Nat. Mus., 97, 171, text fig. 109, pi. 37, figs. 1-3, 1918. 

 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 (Eathbun). 

 Bernards. — Has been taken from the shell of Mya (Eathbun). 



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. 



