THE SPIDER CRABS OF AMERICA 



191 



ornamented (fig. 78) ; dactyls armed with a few (4 to 6) sharp spi- 

 nules, which become longer towards the horny tip of the dactyl. 



Measuremenfs.^—Femnle, holotype, total length of carapace 5.4, 

 length of rostrum 1.6, width of carapace with spines 3.6, without 

 spines 2.7 mm. Both males lack the rostral horns. 



Range. — Porto Rico (southwest coast); 11 to 26 fathoms. 



Fig. 78.— Menaethiops portoricensis, female (56012), a loose leg, much enlarged 



Material examined. — 



Southwest of Salinas Cove; 11 fathoms; July 10, 1915; 1 male 

 (F. 2384, Amer. Mus. Nat. Hist.) ; 1 male, 1 ovigerous female (56012). 



One and a half miles south of Cana Gorda Islands, near Guanica 

 Harbor; 26 fathoms; scattered coral rock and sand with algae; June 

 23, 1915; 1 ovigerous female, holotype (F 2628, Amer. Mus. Nat. 

 Hist.). 



Genus ESOPUS A. Milne Edwards 



Esopus A. Milne Edwards, Crust. Reg. Max., 1S75, p. 89; type, E. 

 crassus A. Milne Edwards. — A. Milne Edwards and Bouvier, Mem. 

 Mus. Comp. ZooL, vol. 47, 1923, p. 389. 



Body and feet almost entirely smooth. Carapace thick, gibbous, 

 and as if inflated. Front formed by a large, rounded, tuberculiform 

 prominence. Basal segment of antenna s^ery large, swollen, extend- 

 ing well beyond eyes. Antennular fossettes very narrow. Orbits 

 incomplete below, postocular process present but separated by a 

 rather wide fissure above. Ocular peduncles stout, and capable of 

 folding into a cavity hollowed for the purpose. Buccal cavity wide 

 in front. Merus of outer maxillipeds a little dilated outward and 

 forward, and not notched on inner side for insertion of palpus. 



