Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 43 



the smaller merus is laterally compressed, the larger one convex dis- 

 tally on the upper surface and spinose along the margin ; the carpus 

 is about as long as the palm, the smaller one with two divergent longi- 

 tudinal rows of spines on the upper surface which widens distally, the 

 larger carpus thick on the inner surface ; the upper, outer face nearly 

 flat, armed with a row of sharp spines along the inner margin, the 

 upper surface granulose and spinose; the palm of the great cheliped 

 is short, nearly as wide as long and thick, the outer surface covered 

 with granules and spines ; the propodal finger is triangular, almost as 

 long as the palm, set with several coarse teeth and slightly thicker 

 than the hinged finger, upon which it closes throughout its length. 

 The smaller cheliped is scarcely one-fourth the size of the larger one 

 and narrower, with the fingers slightly longer in proportion to its 

 length. 



The first and second ambulatories are subequal to each other and to 

 those of the opposite side and are much longer than the chelipeds, 

 the first leg exceeding the length of the small cheliped by the entire 

 length of the dactyl. The dactyl of the ambulatory is very slender, 

 curved, acuminate, about equal in length to the combined related car- 

 pal and propodal joints. 



The fourth legs are small, with the propodus a small, wide suboval, 

 with only a few corneous scales on its posterior lateral margin; the 

 dactyl is curved, acuminate, almost as long as the propodus and pro- 

 jecting direct out beyond it like a hook. 



The fifth legs are weakly chelate, the entire propodus fringed with 

 bristly setae, the outer surface scaled. 



In the very young specimens the granulose rugae are much weaker ; 

 occasional specimens are nearly smooth. 



Found in the shells of Natica, Terehra and several other species. 

 One of the specimens taken by the "Ara" was encased in a small 

 sponge. 



Synonymy. — Pagurus calidus Risso, Hist. Nat. Europe Merid., vol. V, 

 p. 329, 1826.— Eoux, Crust. Medit., pi. XV, 1828.— H. Milne 

 Edwards, Hist. Nat. Crust., vol. II, p. 220, 1837. — Lucas, Anim. 

 Arctic in Expl. Sci. Algerie, Zool., vol. I, pt. 1, p. 29, 1846-49.— 

 Heller, Crust. Sudl. Europ., p. 176, 1863. — Carus, Prodr. Faun. 

 Medit., vol. I, p. 495, 1885. — Henderson, Kept. Voy. "Challenger" 

 Zool., vol. 27, p, 57, 1888.— Ortmann, Zool. Jahrb. Syst., vol. VI, 

 285, 1891-92. — A. Milne Edwards and Bouvier, Crust. Decap. 

 Travailleur et Talisman, vol. I, pt. 1, p. 180, pi. 23, fig. 19, pi. 28, 



