No. 10 GARTH : BRACHYURAN FAUNA OF THE GALAPAGOS 403 



Type locality. — Galapagos Islands. 

 Type. — Not extant. 



Range. — Ecuador (Nobili) ; Peru(Coker) ; Galapagos Islands (Bell). 

 Diagnosis. — Two imbricated, flattened lobes on the side walls of the 

 carapace. Typically 4 anterolateral spines. No lobe on basal antennal 

 article below the acuminate spine. 



Material examined (14 specimens from 9 stations). — 

 27-33. Gardner Bay, Hood Island, shore, Jan. 25, 1933, 1 female 



(photographed). 

 33-33. Black Beach, Charles Island, shore, Jan. 27, 1933, 1 ovig. 

 female. 

 169-34. Academy Bay, Indefatigable Island, 15-25 fms, Jan. 20, 1934, 



1 male. 

 199-34. Black Beach, Charles Island, shore, Jan. 30, 1934, 1 ovig. 



female. 

 313-35. Black Beach, Charles Island, shore, Dec. 6, 1934, 1 female. 

 314-35. Academy Bay, Indefatigable Island, shore, Dec. 7, 1934, 5 



specimens. 

 315-35. Opposite Gordon Rocks, Indefatigable Island, coral, Dec. 8, 



1934, 1 male, 1 young. 

 351-35. South of Black Beach, Charles Island, shore, Dec. 14, 1934, 



1 male. 

 789-38. South Seymour Island, shore, Jan. 19, 1938, 1 female. 



Measurements. — Largest female: length 15.6 mm, width 14.0 mm, 

 cheliped 12.8 mm, chela 6.4 mm. 

 Habitat. — Rocky shore. 



Remarks. — M. aculeatus is a rarely encountered shoreline species. Its 

 discovery by Velero III collectors never failed to arouse comment because 

 of the beauty and variety of its bryozoan and coralline encrustations. 



Known previously from Tagus Cove and Hood and Charles Islands, 

 its range has been extended to Indefatigable and adjacent South Seymour 

 Islands. M. aculeatus is one of the very few species common to the 

 Galapagos Islands and Peru. 



Microphrys triangulatus (Lockington) 

 Plate 63, Fig. 6 



Mithraculus triangulatus Lockington, Proc. California Acad. Sci., vol. 



7, p. 73 (11), 1876 (1877). 

 Microphrys triangulatus Rathbun, Proc. U.S. Nat. Mus., vol. 21, p. 



578, 1898; Bull. 129, U.S. Nat. Mus., p. 505, pi. 177, 1925. 



