168 RATHBUN 
Family H/PPIDA. 
Genus Emerita Gronovius, Benedict. 
EMERITA ANALOGA (Stimpson). 
Hippa analoga STIMPSON, Proc. Boston Soc. Nat. Hist., v1, 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 Bartolomé Bay, Lower California, and 
from Peru to Chile. The intermediate region (from Lower California to 
Panama) is represented by £. emerita (Fabricius), which occurs also on 
the Atlantic side of tropical America. 
Family PORCELLANID. 
Genus Petrolisthes 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 1x, fig. 4. 
Cyclodorippe plana RATHBUN, Amer. Nat., XXXIV, 519, 1900. 
