362 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Color in life. — Carapace light olive gray on frontal and anterolateral 

 regions to pale olive gray on intestinal and posterolateral regions, covered 

 with granules of orange red to dragon's blood red. Tubercles of carapace 

 light orange to almost white tips. Eyestalks with blotches of dark orange 

 red; eye dark olive green. Color of carapace extending about one third 

 on spine, blending into bright orange and fading to white at tip. A light 

 touch of orange on marginal teeth. Distal meral spine of cheliped similar 

 to lateral spine of carapace. Carpus darker than carapace with two spines 

 of orange red. Hand pale dull gray above, crested with orange yellow 

 shading to dull pale yellow on middle outer portion and white beneath. 

 Ambulatory legs pale olive gray with touches of vinaceous purple; tips 

 of dactyls white. (Petersen) 



Habitat. — Sand, sand and coral, sand and mud, sand and rock, sand 

 and shell. 



Depth.— 20-21S fms. 



Remarks. — M. gaudichaudii has the greatest latitudinal range of all 

 Galapagos brachyuran species, from San Francisco, California, to Val- 

 paraiso, Chile. This exceeds the range of the dromid, Drotnidia larraburei 

 Rathbun, which occurs from Monterey Bay, California, to Sechura Bay, 

 Peru, M. gaudichaudii has also an extreme bathymetric range, 20-218 

 fathoms, exceeded by but one other Galapagos species, Euchirograpsus 

 americanus A. Milne Edwards, found from 32-278 fathoms ; the extreme 

 depth in this case is an Atlantic record. Apparently Mursia is widely 

 tolerant to changes in temperature and pressure. 



The affinities of this species are with Japan and Australia, the genus 

 not being found in the Atlantic Ocean. It is characterized by a long lateral 

 spine, suggestive of the attenuated spine of the portunids, particularly 

 Portunus (A.) acuminatus Stimpson (not Rathbun, 1930). 



M. gaudichaudii was not previously recorded from the Galapagos 

 Islands. 



Genus GYGLOeS de Haan, 1837 



Cycloes bairdii Stimpson 



Plate 62, Figs. 7, 8 



Cyclois bairdii Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, p. 237 



(109), 1860. 

 Cycloes bairdii Rathbun, Proc. U.S. Nat. Mus., vol. 21, p. 610, 1898; 

 Bull. 166, U.S. Nat. Mus., p. 225, pi. 69, figs. 3 and 4, and synony- 

 my, 1937. Crane, Zoologica, vol. 22, no. 7, p. 100, 1937. 

 Type locality. — Cape San Lucas, Lower California. 

 Types.—USNM No. 2001. 



