34 Bulletin, Vanderbilt Marine Museum, Vol. Ill 



projected at an obtuse angle to the lower margin, and its upper 

 surface bears two irregular, compound teeth and several tufts of setae ; 

 the movable finger is similarly dentate, slightly incurved and granu- 

 lose on its outer border. The left cheliped is much slenderer and 

 shorter than the right, the greatest width of the left (that of the hand) 

 being less than the width of the right carpus near its base. The fingers 

 of the left cheliped are longer than its hand, whereas those of the 

 right cheliped are shorter than those of the right hand. 



The ambulatory legs are fantastically long and slender; the first 

 pair exceed the length of the great cheliped by the length of the dae- 

 tylus, which is slightly longer than the propodus. The second am- 

 bulatory legs exceed the first in length by about half the length of the 

 dactylus. The ambulatory legs are decidedly laterally compressed, 

 their meral, carpal and propodal joints have the dorsal end, in a less 

 degree, the outer lateral surfaces granular, while the sabre-like dac- 

 tyli are smooth, obscurely channelled longitudinally, slightly tortuous, 

 and apically acute and bordered on the upper and lower margins just 

 behind the apex, with a series of 8 to 10 spine-like setae. 



The fourth and fifth pairs of legs are lamellose and have their bor- 

 ders fringed with fine hairs. 



The abdomen conforms to generic characters. The penultimate seg- 

 ment bears a distinct depression; the last segment has its posterior 

 margin finely crenulate. 



Synonymy. — Parapagurus abyssorum A. M. Edwards, Mss., in Hen- 

 derson, Rept. ''Challenger" Anomura, p. 87, pi. 9, 1888. 

 Parapagurus pilosimanus var. abyssorum A. M. Edwards et Bouvier, 

 Ann. Sci. Nat. Zool., 7 erne, Ser. XLII, p. 205, 1872.— Faxon, 

 Mem. Mus. Comp. Zool., vol. 18, p. 68, 1895. 



Genus: PAGURUS Fabricius. 

 Pagurus albus (Benedict). 



Plate 5. 



Diagnostic characters : The ivory color of this species is its out- 

 standing field character. The long, slender, great cheliped, which has 

 two longitudinal rows of small denticles bounding a depressed region 

 and extending the length of the carpus and palm, readily identify 

 this species. 



Type: Dr. Benedict's type came from the Gulf of California and 

 is deposited in the United States National Museum. 



