Boone, Crustacea, Cruises of ''Eagle" and " Ara," 1921-28 49 



while the left cheliped is very massive and distinctly longer than its 

 adjacent ambulatory, with the merus of the cheliped strongly com- 

 pressed ; the carpus nearly two-thirds as long as the merus ; its upper 

 surface is convex and the propodus is very massive, broadly oval, con- 

 vex on the upper surface, the propodal finger thick, three-fifths as long 

 as the palm, armed with two large teeth distally and several smaller 

 ones proximally. The hinged finger is not quite as thick as the lower 

 one. The small cheliped resembles the larger one but is more com- 

 pressed and has its dactyli furnished with more numerous tufts of 

 short setae. The inner upper margin of the palm of both chelae bears 

 a brush of fine thick setae. 



The first ambulatories are slightly unequal, the dactyl of the right 

 side being a trifle longer and more curved ; both have the dactyli stout, 

 curved, with a sharp claw at the tip. The second pair of ambulatories 

 are longer than the first pair and the right second leg is much longer 

 than the left second leg. The right leg has its propodus wide, com- 

 pressed, its dactyl much elongated, curved and tipped with a sharp 

 nail; the dactyl is one and one-fourth to one and one-fifth times as 

 long as the left dactyl. Both chelipeds and ambulatories have the 

 exposed upper surfaces of the carpus, propodus and dactyl set with 

 brown, corneous scales, which are elevated anteriorly and usually have 

 one or more stiff setae arising in front of them. These scales increase 

 the grasping power. 



The fourth legs have the carpus with a distinct tooth at its anterior 

 distal angle ; the propodus rounded distally and with a large, suboval 

 plate of flexible scales ; the dactyl is small, acuminate and not extend- 

 ing beyond the propodus. 



The fifth legs are chelate, the fingers spatulate; the entire pro- 

 podus and dactyl covered with brush-like setae, which are used in 

 arranging and cleansing the eggs ; there is also an elongate oval patch 

 of scales on the outside of the propodus. 



Synonymy. — Cancer diogenes George Edv^ards, in Catesby, Nat. 

 Hist. Carolina, Florida and the Bahama Islands, vol. 2, 1771, 

 No. 33.— Linnaeus, Syst. Nat., ed. 12, not ed. 10, p. 1758. 

 Cancer clypeatus Herbst, Naturg. d. Krabben u. Krebse, vol. 2, 1791, 

 p. 22, pi. 23, fig. 2A and B. 



Pagurus diogenes Latreille, Encycl. Meth. Hist. Nat., Insectes, vol. 



8, p. 632, tabl. — , part 24, 1818, pi. 284, figs. 2 and 3. 

 Coenohita diogenes H. Milne Edwards, Hist. Nat. Crust., vol. 2, p. 



