of the Pacific Shores of North America. 467 
PACHYGRAPSUS CRASSIPES. Randall. 
Pachygrapsus crassipes, RANDALL; Jour. Acad. Nat. Sci. Philad. viii. 197. 
Distinguished by the square form of the carapax, which 
has a single tooth on each side posterior to that forming the 
outer angle of the orbit;—the broad depressed front, and 
Spiny tarsi. It is very common on the coast of California, 
south of San Francisco, and was found at the Farallone Is., 
(Trowbridge ;) at Monterey, (Taylor ;) and at San Diego, 
(Schott. Ranpauu states that his specimens were found 
at the Sandwich Is., by Nuttall. But the species has never 
been found there by other observers, although the Islands 
have been frequently and well searched for Crustacea. On 
the other hand, RawparL states that his P. parallelus* is 
found on the coast of Oregon, where, however, it has not 
been since observed ; while it is common at the Sandwich 
Is. It is therefore probable, that in the case of Nuttall's 
specimens the labels of the two species were accidentally 
exchanged. : 
Mus. Bost. Soc.; Phil. Acad.; Smithsonian; Acad. Pe- 
_ trop. ; Paris, 
There seems to be no good reason why RANDALL’s name 
P achygrapsus should not be retained for the group called 
Leptog rapsus by Miune-Epwarps. The thick, square, and 
evidently allied forms with a square third article of maxilli- 
peds, for which Dr. R. instituted the genus, are quite dis- 
tinct from the true Grapsi, though forming a group to which 
: Haan proposed to restrict the ancient name of the fam- 
ly. When it was found necessary to divide this group 
into genera, based upon the characters of the orbits and ex- 
ternal antenne, the name Pachygrapsus should certainly 
have been retained for one of them. That Ranpaut did 
hot describe the structure of those parts in his two species, 
* Grapsus thukuhar, Owen; Goniograpsus thukuhar, Dana ; Metopograpsus thu- 
» Milne-Edwards, Mélanges Carcinologiques, p. 131. 
