74 THE BRAG'HYURA. 



Mithrax bellii Gerstaecker. 



Mithrax uraua Bell, Proc. Zool. Soc. London, 1835, 3, 171, pub. Feb. 24, 1836 ; Trans. 



Zool. Soc. London, 1836, 2, 52, pi. 10, figs. 2 and 3. A. Milne Edwards, Miss. 



Sci. au Mexique, 1875, part 5, 1, 103. Not Cancer ursus Herbst. 

 Mithrax bellii Gerstaecker, Arch. f. Natur., 1856, 22, part 1, 112. 

 Mithrax bellii Rathbun, Proc. Wash. Acad. Sci., 1902, 4, 284. 



Chatham Id., Galapagos ; shore ; Jan. 8, 1905 ; 1 ? juv. 



The young of this species, as Bell has shown, presents such a different 

 aspect from the .adult that it might easily be mistaken for another species. 

 Length of young 9, Chatham Id., 21.7, width 20.7 mm. The body and legs, 

 except the chelae, are everywhere covered with a furry hair. The protuber- 

 ances are all sharp-pointed. The rostral horns curve toward each other ; the 

 pair of spines at the base of the horns are nearly as long as the horns and 

 diverge from each other; the next pair is very small. In the adult (<? from 

 Black Bight) the carapace is wider than long (63.6 mm. long x 65.4 mm. 

 wide), the surface is almost wholly naked, and the protuberances are very 

 stout, blunt tubercles. 



Mithrax denticulatus Bell. 



Mithrax denticulatus Bell, Trans. Zool. Soc. London, 1836, 2, 54, pi. 11, fig. 2. 



Perico Id., Panama; Oct. 26, 1904; H,2?. 



Thoe erosa Bell. 



Thoe erosa Bell, Proc. Zool. Soc. London, 1835, 3, 171, pub. Feb. 24, 1836; Trans. Zool. 

 Soc. London, 1836, 2, 48, pi. 9, fig. 4. A. Milne Edwards, Miss. Sci. au Mexique, 

 1875, part 5, 1, pi. 19, fig. 4 ; 1S78, p. 121. 



Taboguilla Id.; between tide-marks; Oct, 31, 1899; 1 S. 

 Perico Id., Panama; Oct. 26, 1904; 1 <?. 



CALAPPIDAE. 



Calappa convexa Saussure. 



Calappa convexa Saussure, Rev. Mag. Zool., 1853, (2), 5, 362, pi. 13, fig. 3. 

 Taboguilla Id. ; shore ; Oct. 28, 1904 ; 1 i. 



