58 CALIFORNIA ACADEMY OF SCIENCES. 



Length of Carapace. Width of Carapace. 



Female. 26 mm. 40 mm. 



" 21.75 mm. 32 mm. 



" 15 mm. 21.5 mm. 



" 11 mm. 16 mm. 



One large specimen from southern California (pre- 

 cise locality unknown) measured 36.25 mm. by 56.75 

 mm. 



San Pedro! San Diego! southern California! Catalina 

 Harbor (Rathbun, M.), Guadalupe Island, Lower Cali- 

 fornia (Rathbun, M.), San Clemente Island! 



This is a very common species on the coast of south- 

 ern California. I have not seen Lockington's type, 

 which could not be found in the Academy, but there 

 were other specimens in Lockington's collection which 

 bore the name Xantho vittata St. written above the e'ar- 

 lier name Xantho novem-dentatus which had been partly 

 scratched out. I have seen the types of Cycloxanthus 

 californienis and compared them with specimens I had 

 identified as novem-dentatus by a comparison with the 

 specimens in Lockington's collection. There is, I 

 believe, no doubt that the two species are identical. 

 This species is closely allied to vittatus St., but I think 

 we must accept Miss Rathbun's conclusion, that it is 

 distinct, although it was considered a synonym of the 

 latter species by Milne-Edwards and subsequently by 

 Lockingtou himself. At the National Museum in Wash- 

 ington I had the opportunity of comparing specimens 

 of vittatus from the western coast of Mexico with several 

 specimens of this species. The former species differs in 

 its longer and sharper lateral teeth, its broader hands, 

 and its narrower abdomen. 



