244 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Eupleurodon peruvianus Rathbun, 1924a, p. 2; type locality, Ferrol Bay 

 (Chimbote), Peru; ovigerous female holotype, U.S.N.M. No. 

 40462; 1925, p. 161, pi. 49, figs. 5, 6; text-fig. 60. 



Type: Male holotype, U.S.N.M. No. 54208, length 4.8 mm, greatest 

 width 3.5 mm. 



Type locality : Chincha Islands, Peru ; R. C. Murphy, collector. 



Localities subsequently reported, with collectors: Peru: north end of 

 Ferrol Bay (Chimbote), R. E. Coker (Rathbun, 1924a, female holotype 

 of Eupleurodon peruvianus) . 



Atlantic analogue: None. A Peruvian and Ecuadorean endemic 

 species. 



Diagnosis: Male: Hepatic width exceeding branchial; rostrum elon- 

 gate, faintly bilobate; orbital arch forming an angle with margin of 

 rostrum. Male first pleopod with a hollowed-out thumb process opposing 

 pointed, spinulous tip. Female: Branchial width exceeding hepatic; ros- 

 trum foreshortened, tip incised ; a prominent preorbital lobe. Merus of 

 external maxilliped entire or slightly notched in both sexes. 



Description: Carapace very uneven. Median region separated from 

 hepatic and branchial regions by a deep furrow; a transverse, depressed 

 area across the carapace embracing anterior edge of hepatic lobes; a 

 sharp, median, interorbital sulcus. Hepatic lobe very large, recurved, 

 anterior margin transversely concave, outer angle lobiform, prominent, 

 posterior margin slightly convex; branchial lobe very small, acute, sides 

 concave. Orbital arch swollen, margin forming an angle, not a tooth, with 

 the margin of the rostrum. Rostrum deflexed, thin, oblong, sides parallel 

 to near the tip, there thick, recurved and convergent; tip bilobed, lobes 

 small, sinus wide. 



Cheliped of young male shorter than first leg, fingers not gaping. 

 First and second legs similar, stout, merus laminate above, and two- or 

 three-toothed, the tooth at distal end prominent, upstanding; propodus 

 with a strong tooth below, at proximal end. (Rathbun, 1925, p. 157, 

 modified) 



Female : Carapace pentagonal ; depressions as in Eupleurodon trifur- 

 catus. A transverse row of tubercles across the gastric region above the 

 depression, the inner pair larger than the outer pair ; a large tubercle near 

 the posterolateral angle; a smaller one in the branchiocardiac furrow; a 

 still smaller tubercle on the mesogastric and the intestinal regions, and 

 three on the cardiac region forming a triangle pointing backwards. Teeth 

 and prominences of carapace setose. Lateral teeth or lobes recurved, 

 blunt at tips ; width of carapace at middle of anterolateral lobes greater 



