510 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Habitat. — Rocky shore. 



Depth. — Shore. 



Remarks. — After a microscopic examination of over 200 Pachygrapsus 

 from the Galapagos Islands, most of which are minute, it appears that all 

 have the distal extremity of the merus of the last ambulatory leg finely 

 dentate and so must be classified as P. transversus (Gibbes) instead of as 

 P. crassipes Randall (1839), in which the merus is entire. Since Boone 

 (1927, p. 257) figures and describes as crassipes a young Grapsus grapsus 

 (Linnaeus), there remains but a single record of the occurrence in the 

 Galapagos Islands of P. crassipes, that of Rathbun (1902). The identifi- 

 cation of this specimen is correct, as verified by Mr. G. P. Ashcraft. The 

 error, if there be one, is on the label. The specimen (USNM No. 25663) 

 is one of three (2 males, 1 female) taken by the Hopkins-Stanford Expe- 

 dition in 1898-99 and recorded from Tagus Cove, Albemarle Island, in 12 

 fathoms of water. Other species taken at this station were Micropanope 

 polita {R.zthhun) , Medaeus spinulifer (Kathhun) , P or tunus (Achelous) 

 angustus Rathbun, Stenorynchiis debilis (Smith), Podochela margaritaria 

 Rathbun, and Microphrys triangulatus (Lockington). While it is normal 

 for the above-mentioned species to be found in 12 fathoms, it is not 

 usual to encounter P. crassipes outside the intertidal zone ; in fact, records 

 of its occurrence at any depth at all are nonexistent. Although it is possible 

 that there may have been a shore station of the same day at which P. 

 crassipes was collected, to be later inadvertently placed in a bottle contain- 

 ing the dredged specimens, it is more probable that the crassipes was col- 

 lected at a more northerly station. This is borne out by the fact that in 

 his unpublished personal notes R. E. Snodgrass records spending a day 

 ashore on the south end of Guadalupe Island at Whaler's Bay, where 

 crassipes is abundant. Until further specimens are obtained to substantiate 

 this Galapagos record, it seems unwise to consider crassipes a. member of 

 the Galapagan fauna. 



Genus PLANES Leach 

 Planes minutus (Linnaeus) 



Cancer minutus Linnaeus, Syst. Nat., ed. 10, vol. 1, p. 625, 1758. 

 Planes minutus Verrill, Trans. Conn. Acad. Arts and Sci., vol. 13, p. 325, 



pi. 13, figs, a-j'; pi. 27, fig. 6; text fig. 7, 1908. Rathbun, Proc. 



Washington Acad. Sci., vol. 4, no. 8, p. 278, 1902; Bull. 97, U.S. 



Nat. Mus., p. 253, pi. 63, 1918. Boone, Zoologica, vol. 8, no. 4, 



p. 259, fig. 94, 1927. Crane, Zoologica, vol. 22, no. 3, p. 77, 1937. 

 Type locality. — "fn Pelagi Fuco natante." 



