468 Stimpson on the Crustacea and Echinodermata 
is no reason for rejecting it,—this was not necessary in the 
definition of the group. As well might we reject the name 
Grapsus itself, because we cannot determine from Lamarcx’s 
descriptions many characters now considered important. 
Rax»aLr's first-mentioned species, P. crassipes, which we 
may consider as typical, is closely allied to the Mediter- 
ranean Grapsus varius ; having the internal suborbital lobe 
widely separated from the front, admitting the external 
antenne within the orbit. It therefore belongs to M. Ep- 
warps’s division Leptograpsus. P. parallelus will come 
under Metopograpsus, which genus seems to be the nearest 
ally of Leptograpsus, although M. Epwarps places Grapsus 
between them. In fact, M. thukuhar might well be consid- 
ered an intermediate species, for the suborbital lobe is here 
not quite joined to the front, although approximating closely 
to it. 
PSEUDOGRAPSUS OREGONENSIS. Dana. 
Pseudograpsus Oregonensis, Dana; U. S. Exploring Expedition, Crust. i. 334, 
XX. f. 6. Mitnz-Epwarps; Mélanges Carcinologiques, 157. STIMPSON ; 
Proc. Cal. Acad. Nat. Sei. i. 88. 
The Pseudograpsi are easily distinguished from the other 
Grapsi of this coast by the approximation of the inner mar- 
gins of the outer maxillipeds, which, in the other forms, 
are widely separated by a rhomboidal space. The present 
species differs from the next in the hairiness of its feet. It 
is bluish-gray above, clouded anteriorly with patches of 
dark red dots; the feet, with the exception of the light- 
colored anterior pair, are sparsely dotted with red. The 
carapax is usually about an inch in length. The lanose 
spot on the hand is found in the male only. 
This species occurs very abundantly on the muddy shores 
of sheltered bays, generally among pebbles and under stones 
about half-tide mark. It was found in Puget Sound, (Suck 
ley ;) Tomales Bay, (Samuels ;) and in San Francisco Bay, 
( Ayres.) 
