1 68 RATHBUN 



Family HIPPID&. 

 Genus Emerita Gronovius, Benedict. 

 EMERITA ANALOGA (Stimpson). 



Hippa analoga STIMPSON, Proc. Boston Soc. Nat. Hist., VI, 85, 1857. For 

 synonymy, see Holmes. 



Distribution. According to Holmes, this species extends from Oregon 

 to Panama. The collections in the National Museum range from 

 Drake Bay, California, to San Bartolome Bay, Lower California, and 

 from Peru to Chile. The intermediate region (from Lower California to 

 Panama) is represented by E. emerita (Fabricius), which occurs also on 

 the Atlantic side of tropical America. 



Family PORCELLANID^E. 



Genus Petrolisth.es Stimpson. 



PETROLISTHES CINCTIPES (Randall). 



Distribution. From Vancouver Island, British Columbia, to the Gulf 

 of California. 



PETROLISTHES ERIOMERUS Stimpson. 

 Distribution. From Humboldt Bay to Pacific Grove, California. 



Genus Pachycheles Stimpson. 



PACHYCHELES RUDIS Stimpson. 

 Plate vi, fig. 6. 



Distribution. British Columbia to Santa Catalina Island, California; 

 Lower California (Lockington). 



PACHYCHELES PUBESCENS Holmes. 

 Distribution. California, from Humboldt County to the Farallones. 



Suborder BRACHYURA. 



Family DORIPPID&. 



Genus Clythrocerus A. Milne Edwards and Bouvier. 



CLYTHROCERUS PLANUS (Rathbun). 



Plate ix, fig. 4. 

 Cyclodorippe plana RATHBUN, Amer. Nat., xxxiv, 519, 1900. 



