Boone, Crustacea, Cruises of "Ara" and "Alva" 261 



Family: PAGURIDAE 

 Subfamily: Pagurinae 



Genus: PETROCHIRUS Stimpson 



Petrochirus bahamensis (Herbst) 



in shell of 



Cymatium gibbosum Brodei'ip 



■f 



Volume II, plate 1 



Material examined: One very large specimen, in the mol- 

 lusk shell, Cymatium gibbosum Broderip, dredged in 45 fathoms, 

 five miles west of Isla del Reyo, Isla de Morete, Perlas Islands, 

 bearing 270° true, 4.5 miles distant, in Panama Bay, Pacific Ocean, 

 March 2, 1938, by the "Alva" American Pacific Cruise, 1938, 



Discussion : The present specimen, which is an exceptionally 

 large example of the species, is identical in diagnostic charac- 

 ters with those from the West Indies, reported by the writer 

 (1930). 



References : Petrochirus bahamensis, Boone, L., Bull. Vander- 

 bilt Mar. Mus., 1930, vol. Ill, p. 21, pi. 1 (with full description 

 and figure) . 



Genus: CALCINUS Dana 

 Calcinus elegans (H. M. Edwards) 



/ 



Volume VI, plate 3 



Material examined : Twenty-four specimens, taken on Kusai 

 Island, Caroline Islands, January 2, 1929, by the "Ara," estab- 

 lishing the first record of it in the Carolines. 



Discussion : The "Ara" World Cruise secured an exception- 

 ally fine series of this gaily coloured small hermit crab, v/hich 

 includes specimens ranging in size from the earliest post-larval 

 crablings to unusually large old specimens with the precervical 

 portion of the carapace nearly an inch long. 



This species was secured by the "Alva" World Cruise, 1931- 

 1932, at both the Society and Fiji Archipelagoes, and is fully de- 

 scribed and illustrated in Volume VI, Bulletin of the Vanderbilt 

 Marine Museum, p. 23, pi. 3. 



