No. 10 garth: brachyuran fauna of the galapagos 389 



Color in life. — Carapace olive buff with yellowish tint. Touches of 

 red around bases of spines. Eye dull dark purple. Cheliped pale cream 

 buff with a few blotches of vermilion and green. Legs pale cream buff 

 banded with deep olive buff with orange-red margins. (Petersen) 



Habitat. — Sand, sand and shell ; also one varied bottom marked "rock, 

 coral, nullipore, and biyzoa." 



Depth.— 2y2-\60 fms. 



Remarks. — M. (M.J spinipes is a companion species, in point of habi- 

 tat, with Anomalothir hoodensis Garth, being encountered in both deep 

 and shallow dredging. A depth of 160 fms, recorded on the 1938 cruise, 

 represents a valuable extension of bathymetric range, the Albemarle 

 Island record a new locality within the archipelago. 



A Galapagos specimen of M. (M.) spinipes has been compared with 

 the type of M. (M.J mexicanus Glassell (1936) by Miss Jocelyn Crane 

 of the New York Zoological Society, who finds them identical. Miss 

 Crane allows herself to be quoted to the effect that she has seen examples 

 clearly intermediate in developmient of anterolateral spines, shape of cara- 

 pace, and development of paired anteromesogastric tubercles between the 

 two, which would indicate M. (M.J mexicanus to be the young of M. 

 (M.J spinipes. 



Mithrax (Mithrax) bellii Gerstaecker 

 Plate 66, Figs. 1, 2 



Mithrax ursus Bell, Proc. Zool. Soc. London, vol. 3, p. 171, 1835 (1836) 

 (not Cancer ursus Herbst, 1788) ; Trans. Zool. Soc. London, vol. 

 2, p. 52, pi. 10, figs. 2, 2c-e, 1836. 

 Mithrax bellii Gerstaecker, Arch, fiir Naturg., vol. 22, pt. 1, p. 112, 



1856; name substituted for M. ursus Bell (not Herbst). 

 Mithrax (Mithrax J bellii Rathbun, Bull. 129, U.S. Nat. Mus., p. 403, 

 pis. 142 and 143, 1925. Boone, Zoologica, vol. 8, no. 4, p. 155, fig. 

 49, 1927. Hult, Arkiv. for Zoologi, Band 30A, no. 5, p. 11, 1938. 

 Type locality. — Galapagos Islands. 

 Type. — Not extant. 



Range. — Galapagos Islands, shore to a depth of 6 fms, (Bell) ; Chile 

 (Miers). 



Atlantic analogue. — M. (M.J verrucosus Milne Edwards. 

 Diagnosis. — Carapace paved with flat, round granules. Five tubercles 

 on inner margin of wrist. Margin broken into numerous irregular 

 tubercles. 



Material examined (76 specimens from 28 stations). — 

 33-33. Black Beach, Charles Island, shore, Jan. 27, 1933, 2 males, 

 2 females. 



