No. 10 garth: brachyuran fauna of the galapagos 441 



Genus LIPAESTHESIUS Rathbun, 1898 



Lipaesthesius leeanus Rathbun 



Plate 75, Figs. 3, 4 



Lipaesthesius leeanus Rathbun, Proc. U.S. Nat. Mus., vol. 21, p. 585, pi. 

 42, figs. 4 and 5, 1898; Bull. 152, U.S. Nat. Mus., p. 272, pi. 112, 

 text fig. 43, 1930. 

 Medaeus rugosus Boone, Zoologica, vol. 8, p. 201, fig. 70, 1927. 



Type locality. — Southern part of the Gulf of California, 10 fms. 

 Type.— [J^^M No. 21581. 



Range. — East of La Paz, Gulf of California (Albatross) j Galapagos 

 (Arcturus) (as Medaeus rugosus) ; 4-10 fms. 



Diagnosis. — Anterolateral margins running obliquely downward and 

 forward to the buccal cavity, instead of to the orbits. Antennal flagellum 

 completely concealed by large basal article bordering the orbit. 

 Material examined (13 specimens from 5 stations). — 

 69a-33. Albemarle Point, Albemarle Island, 12 fms, bottom sample, 



Feb. 11, 1933, 2 specimens. 

 167-34. Post Office Bay, Charles Island, 15 fms, Jan. 19, 1934, 4 males. 

 177-34. Sulivan Bay, James Island, 5-20 fms, Jan. 23, 1934, 2 males, 



1 female. 

 196-34. Post Office Bay, Charles Island, 8-10 fms, Jan. 29, 1934, 1 



male, 1 female. 

 795-38. Sulivan Bay, James Island, 35-40 fms, Jan. 21, 1938, 2 fe- 

 males (1 photographed). 

 Measurements. — Largest female: length 5.6 mm, width 8.0 mm. 

 Habitat. — The character of the bottom, where noted, was "very 

 rocky" or "rock with sand patches." In two instances the dredge brought 

 up a pair. 



Depth. — 4-40 fms. 



Remarks. — The writer has examined the type of Medaeus rugosus 

 Boone in the collection of the New York Zoological Society and agrees 

 with Rathbun (1930) that it is identical with L. leeanus. 



The aptness of the name Lipaesthesius, which means "to lack percep- 

 tion by feeling," vanishes with the discovery that a small but complete 

 antennal flagellum exists, although hidden from view by the basal 

 antennal article. 



The vertical range of the species has been extended to 40 fms. 



