No. 10 garth: brachyuran fauna of the galapagos 405 



Depth. — Shoal water to 40 fms. 



Sex variation. — Adult male has well-developed chelipeds, broad 

 fingers, wide gape. 



Remarks. — Velero III records considerably extend the range of this 

 species within the insular group, it being known previously from but two 

 specimens taken at Tagus Cove, Albemarle Island, by the Hopkins- 

 Stanford Expedition. M. triangulatus is the commonly dredged Micro- 

 phrys of the Galapagos Islands, M. aculeatus the shore-dwelling species. 



The known depth is hereby increased from 10 to 40 fms. 



Microphrys platysoma (Stimpson) 

 Plate 68, Figs. 3, 4 



Milnia platysoma Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, p. 



180, 1860. 

 Microphrys platysoma A. Milne Edwards, Crust. Reg. Mex., p. 62, 

 1875. Rathbun, Bull. 129, U.S. Nat. Mus., p. 497, pi. 176, figs. 1 

 and 2, and synonymy, 1925. Crane, Zoologica, vol. 22, no. 3, p. 63, 

 1937. Not Rathbun, Proc. Washington Acad. Sci., vol. 4, no. 8, p. 

 285, 1902. 



Type locality. — Cape San Lucas, Lower California. 

 Type. — Not extant. 



Range. — From Patos Island, Gulf of California (California Academy 

 of Sciences), to Panama (Meek and Hildebrand) ; Salinas, Ecuador 

 (Schmitt, unpublished) ; low tide to 4^^ fms. 

 Atlantic analogue. — M. antillensis Rathbun. 



Diagnosis. — Two imbricated, flattened lobes on the sides of the cara- 

 pace. Two branchial spines on each side in the same transverse line. A 

 lobe on the basal antennal article below the single spine. 

 Material examined. — 

 783-38. Darwin Bay, Tower Island, 40-70 fms, Jan. 16, 1938, 2 young 

 (1 photographed). 

 Measure?nents. — Young specimen: length 6.3 mm, width 5.0 mm. 

 Habitat. — White sand and rock. 

 Depth. — Low tide to 70 fms. 



Remarks. — In view of the fact that M. aculeatus is invariably a shore- 

 collected species, Miss Rathbun (1925) was undoubtedly right in refer- 

 ring the Hopkins-Stanford ^'platysoma" to that species, since it was 

 collected on a reef north of Tagus Hill, a shore locality. The Hancock 

 specimens were dredged in 40-70 fms, and, although not mature, show 

 the two imbricated lobes clearly. Because of the depth at which they 

 were obtained, thy could scarcely be aculeatus^ and the only other Pacific 

 Microphrys with two imbricated lobes is platysoma. 



