62 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



fathoms, and off Cape San Lucas, 31 fathoms, Albatross (Rath bun, 

 1925) ; Magdalena Bay, shore, Zaca (Crane) ; Gulf of California: 

 northwest of Cape Tepopa, 45 fathoms, type locality of Batrachonotus 

 nicholsi, also 145 fathoms, and southeast of Tiburon Island, 29 fathoms, 

 Albatross (Rathbun, 1925) ; Santa Inez Bay, 30-35 fathoms, Arena 

 Bank, 33-45 fathoms, Gorda Banks, 40-45 fathoms, and San Lucas Bay, 

 2-20 fathoms, Zaca (Crane) ; Panama: Pinas Bay, 14-33 meters, Askoy 

 (Garth); Colombia: Utria Bay [Port Utria], 12-22 meters, Askoy 

 (Garth). 



Atlantic analogue: Euprognatha rastellifera Stimpson. 



Diagnosis: Interantennular spine obsolescent, antennal spines equally 

 advanced with front. Postocular tooth slender, spine-tipped. Two spines 

 horizontally placed at intestinal level in males, often reduced to bead 

 granules in females. Chelipeds of adult male little more than two times 

 length of carapace. Male first pleopod with a semicylindrical lobe pro- 

 tecting orifice. 



Description: Carapace conspicuously and coarsely granulate; a spine 

 on gastric, cardiac, and branchial regions and on first segment of ab- 

 domen ; two spines on intestinal region. Postocular tooth with slender 

 tip. Frontal teeth small, triangular, subacute. Antennal spines slender, 

 directed obliquely forward, equally advanced with the front; a shallow, 

 subtriangular, interantennular plate [with a reduced] spine. A short 

 spine on orbital arch. Lateral margins spinous; one hepatic spine, two 

 prominent branchial spines, and one spine on pterygostomian ridge, 

 visible in dorsal view just behind the hepatic region. 



An oblique arched lamina at each end of epistome. Sternum of male 

 and abdomen of female coarsely granulate; in both a granulate raised 

 A-shaped ridge at anterior end of sternum. 



Legs covered with spiniform granules, larger on margins of chelipeds. 

 Palm inflated; fingers moderately gaping in proximal three- fourths. 

 First pair of ambulatory legs a little more than twice as long as cara- 

 pace. (Rathbun, 1925, modified) 



Material examined: A total of 1,145 specimens from 117 stations. 

 (See Table 5) From San Benito Islands, Lower California, and Tepoca 

 Bay, Gulf of California, Mexico, to Cape San Francisco, Ecuador. 

 Socorro, Clarion, and Cocos Islands. 



Measurements: Largest specimen, a male: length 12.4 mm, width 

 11.0 mm, rostrum 1.0 mm, cheliped 17.7 mm, chela 7.3 mm, dactyl 

 3.8 mm, ambulatory legs 24, 17, 14.5, and 11 mm, respectively. Female: 

 length 7.8 mm, width 6.1 mm. 



