CRUSTACEA. 
127 
P. crassipes. Mus. Acad. 
Testa antice convexa, transverse striata, utrinque 2-den- 
tata; fronte producta, supra 4-lobata; corpore crasso, postice 
gradatim retracto. 
Body very stout, carapax convex anteriorly, with 
two stout teeth on each side, including that which 
forms the outer angle of the eye ; disk anteriorly 
and laterally striate, the strife accompanied, for the 
most part, by yellowish lines; front considerably 
depressed, with four rounded lobes above, all very 
convex, and resembling great tubercles; frontal 
edge obtuse, rather prominent, nearly straight, a 
little sinuous near the angles ; anterior feet nearly 
smooth and very large in the male ; the surface of 
the carpus lightly rugose; four posterior pairs of 
feet much flattened; tarsi short, very stout and 
spinous. 
Length about 1 A inches; greatest breadth be- 
tween 1 T V and l T s o inches. 
A single specimen (a male) brought by Mr. Nut- 
tall from the Sandwich Islands. 
This species seems to be nearly allied to the 
Grapsus messor of Forskal, but the carapax in that 
species has but one lateral tooth. 
P. parallelus. Mus. Acad. 
Testa quadrata, striata, polita, convexa, margine utrinque 
pone oculos 1-dentata. 
Shell quadrate, nearly flat on the upper surface, 
lightly striate anteriorly, but very profoundly on 
the sides, where the striae become plicate, some of 
