1921 J Schmitt: The Marine Decapod Crustacea of California 115 



Genus Upogebia Leach 



First pair of legs subequal and subchelate; remaining pairs simple. Eye-stalks 

 cylindrical; cornea terminal. Rostrum short, stout, tridentate. 



Upogebia pugettensis (Dana) 



Gebia pugettensis Dana, Proe. Acad. Nat. Sci. Phila., 6, 19, 1852; Crust. 



U. S. Expl. Exped., pt. 1, p. 510, 1852, pi. 32, fig. 1, 1855; Stimpson, 



Jour. Boston Soe. Nat. Hist., 6, 488, pi. 21, fig. 2, 1857; Lockington, 



Ann. Mag. Nat. Hist. (5), 2, 299, 1878. 

 Upogebia pugettensis Holmes, Occas. Papers Calif. Acad. Sci., 7, 157, 



1900; Eathbun, H. A. E., 10, 153, 1904. 



Fig. 77. Upogebia pugettensis; a, lateral view of carapace, X 2 (after Dana) ; 

 b, hand with setae removed, X % (after Stimpson). 



Characters. — Upper portion of carapace in front of cervical groove flattened, 

 scabrous, and hairy; marked with three longitudinal grooves, median groove the 

 shortest; front tridentate, with median tooth large, horizontal, and triangular, 

 lateral teeth short. Eye-stalks short, reaching very little farther forward than 

 lateral teeth of front. 



Dimensions. — Type: length 50.8 mm. The length of the carapace of the Bay 

 specimens ranges from 11 to 14 mm. 



Type Locality. — Puget Sound. 



Distribution. — From southeastern Alaska to San Quentin Bay, Lower Cali- 

 fornia (Eathbun). 



Remarks. — This species excavates its subterranean burrows in the sand and 

 mud of beaches, near low water marks, preferring that which is more or less 

 indurated (Stimpson). 



Biological Survey of San Francisco Bay. — Although only three 

 specimens were taken in the course of the survey, one at Sausalito, 

 February 8, and two at Tiburon, April 29, 1913, Lockington says : 



This species is exceedingly abundant in San Francisco and Tomales bays, and 

 frequently attains a length of six inches or even more. 



The subterranean passages made by it are usually nearly perpendicular, about 

 an inch across, and very neatly rounded in section, with the walls smooth as if 

 plastered, the smoothness resulting entirely from the pressure of the animal's 

 body as it pushes itself upwards and downwards by the action of its terminal 

 abdominal segments. 



The burrows are not confined to strata of sand but are abundant also in mud. 

 in sandy shingle, and even among rocks, ranging upwards almost to high-water 



