318 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Ambulatory legs elongate, hairy ; meri with from seven to nine spin- 

 ules on anterior and not exceeding three on posterior margins; carpi 

 with but a single, distal spinule; propodi long, cylindrical, unarmed; 

 dactyli spinulous beneath, amber tips recurving. 



Male abdomen seven-segmented, narrowing from base of third to 

 middle of sixth segment, seventh segment narrowly rounded. Male first 

 pleopod with a sail-shaped projection, the distal edge of which spirals 

 toward the sharply pointed tip. (See Plate S, fig. 5) 



Cheliped of female shorter than first walking leg; manus with supe- 

 rior proximal row of spines as in male, but with narrower gape and less 

 prominent digital tooth or ridge. 



Material examined: 30 specimens from 21 stations. (See Table 65) 

 From Monterey Bay, California, to Asuncion Point, Lower California, 

 Mexico, including the offshore islands of Santa Cruz, Santa Catalina, 

 and Guadalupe. 



Measurements: Largest specimen, a soft-shelled male: length 33.0 

 mm, width excluding spines 30.0 mm, rostrum 4.2 mm, width 4.6 mm, 

 cheliped 54 mm, chela 26 mm, dactyl 10 mm, ambulatory legs 48, 44, 

 41, and 37 mm, respectively. Largest female: length 19.5 mm, width 

 17.1 mm. 



Color in life: Carapace light tan mottled with dark brown; ambula- 

 tory legs barred with reddish brown ; chelipeds, with the exception of 

 light finger tips, a still more pronounced red. (Weymouth) 



Habitat: Under stones at medium low tide. (Nininger) From a 

 large tide pool. (Weymouth) With the exception of one specimen 

 dredged (see below), all Hancock specimens were obtained from rocky 

 shore between tides. 



Depth: Intertidal, but occasionally obtained at depth, as at White 

 Cove, 9-11 fathoms, Velcro IF, and Catalina Harbor, 30-40 fathoms, 

 W. H. Dall, and off Magdalena Bay, 34-36 fathoms, Albatross (Rath- 

 bun, 1893a). 



Size and sex: Males in the present series are from 5.0 to 33.0 mm, 

 females from 6.5 to 19.5 mm, the single ovigerous specimen being 18.5 

 mm in length. 



Breeding: An egg-bearing female was encountered by the Velero IV 

 at Guadalupe Island, Mexico, in December. 



Remarks: The involved synonymy of this species and Herbstia campta- 

 cantha becomes simplified at once with the application of geographical 

 criteria. Accepting the range Monterey Bay, California, to Magdalena 

 Bay, Lower California, as delimiting the distribution of H. parvifrons, 



