146 PROCEEDINGS OF THE CALIFORNIA 



female abdomen widest; sixth a semi-ellipse, with the small seventh segment 

 inserted in a concavity of the anterior margin. 



c? P 



M. M. M. M. 



Greatest length of carapax 45 32 



Greatest width of carapax 53 37.5 



Length of right manus 48 28 



Width of right manus 28 15 



Several specimens from Magdalena Bay, West Coast Lower California; 

 La Paz, Lower California; and Boca de las Piedras, Sinaloa, Gulf of Cali- 

 fornia. 



0. Gaudichaudii was found at Panama by Mr. Sternbergh (Stimpson, Notes 

 on North Amer. Crust., p. 15); and also in the Gulf of Fonseca, Central 

 America, by J. A. McNeil (S. T. Smith, Peabody Acad. Sci., 1869, p. 91). 



No. 43. Male and female. Gulf of California. W. J. Fisher. 



Genus Gelasiinus. 



Six species of this genus are included in the collection of Mr. W. J. 

 Fisher. One only of these belongs to the section having a narrow front, with 

 the bases of the ocular peduncles close together. This is the G. princeps of 

 S. T. Smith. 



Another species, having the fourth, fifth and sixth abdominal segments 

 united, is certainly the G. gifobosus of the same author. Another I believe to 

 be the G. brevij'rons of Stimpson. 



None of the remaining kinds answer to Stimpson's and Smith's description 

 of G. p,anamensis, so that unless two of them are referable to the Chilian 

 species, G. macrodactylus and G. stenodactylus, it is fair to suppose they are 

 new species. I have described two of them as new, and the remaining one, 

 with some misgiving, I provisionally refer to G. stenodactylus. 



Gelasimus princeps. S. T. Smith. Trans. Conn. Acad., 11, 120, plate 11, 

 fig. 10; pi. Ill, f. 3-3e. 



This species is found in holes under rocks at low tide. The female, as 

 noticed by S. T. Smith, differs considerably from the male, having the cara- 

 pax less narrowed behind, with granules thickly scattered over the dorsal 

 regioiiS. 



Two large specimens measure : 



Inch. Inch. 



Extreme width of carapax 1.65 1.37 



Extreme length of carapax 1.03 .35 



Length of large hand 3.00 



Width of large hand 0.95 



Localities — Magdalena and San Bartolome Bays, West Coast Lower Cali- 

 fornia. W. J. Fisher. Corinto, Nicaragua. J. A. McNeil. 



