328 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



legs were taken segmentally, with somewhat larger totals than are to be 

 expected when legs are flexible and can be measured along a continuous 

 inferior margin.) 



Color in life: Carapace dark bluish green. Chelipeds and ambulatory 

 legs lighter and over all small black spots, evenly placed. Ventral surface 

 deep olive buff. Eyes black. (Petersen) 



Habitat: Fine gray sand, broken shell. (Rathbun, 1925) Velero III 

 specimens were obtained three times on sand bottom, once on sand with 

 shell, and once on mud with sand. 



Depth: 8 to 35 fathoms. Depth was not given on the San Felipe 

 specimens, which may have been obtained at extreme low tide. 



Size and sex: Apart from the large male and female measured above, 

 the present series consists of males from 11.5 to 27.3 mm and of females 

 from 16.0 to 19.1 mm. 



Breeding: The 59.6 mm female from San Felipe is ovigerous. Unfor- 

 tunately its date of capture can be given only as fall of 1946 to March 

 of 1947. 



Remarks: The large pair described above were brought to the Allan 

 Hancock Foundation by Dr. Carl L. Hubbs. Permission to retain and 

 describe them was graciously given by Dr. Alden Noble, for whom they 

 were collected by Johnny Rodriguez, a fisherman, at San Felipe in the 

 upper part of the Gulf of California. They are the only adult specimens 

 known. 



Libinia mexicana is an example of a Gulf of California endemic 

 species clearly delimited from its west coast of Lower California cognate, 

 yet closer to it than to any other species of the genus. 



Libinia rostrata Bell 

 Plate T, Fig. 6; Plate 37, Fig. 2 



Libinia rostrata Bell, 1835b, p. 169; 1836, p. 42, pi. 8, fig. 3. White, 

 1847, p. 4. Miers, 1886, p. 73. Rathbun, 1910, p. 572; 1925, p. 

 329, part (not the Atlantic specimens), pi. 242 (not pi. 122, fig. 2). 



Type: Male holotype, length 67.7 mm, width 57.2 mm, originally 

 deposited in the Museum of the Zoological Society [London], no longer 

 extant. In view of this fact a male specimen, U.S.N.M. No. 100916, from 

 Paita, Peru, October, 1926, W. L. Schmitt, collector, is hereby desig- 

 nated neotype. 



Type locality: Peru, 5 fathoms, soft mud; Hugh Cuming, collector. 



Localities subsequently reported, with collectors: None. Specimens 

 from Atlantic Panama and Brazil referred to this species by Rathbun 

 (1925, p. 330) are believed instead to represent a distinct species. 



