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EXTRACTED FROM THE | AMERICAN JOURNAL. OF SCIENCE: AND ARTS, VOL. XII. 
. SECOND aedem 3851. — * 
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&8 I AMESSIFIOWETON.. ue m ^ 
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; E an lh Br JAMES D. DANA. — 
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jut GRAPSOIDEA, in the system here explained, correspond to the 
í iiucipmetopa of Edwards, excepting that we separate the Telphusa, 
- group and place it with the Cancroidea.* 
| A few of the species have the fourth joint of the outer maxillipeds.- - 
articulated by the inner angle with the third, as in the Cancroidea : of 
these we make the family GoNoPLACIDZ, or the GRAPSOIDEA CANCRIDICA. 
In all the other species, this articulation is remote from the inner an- 
gle, being either near the middle of the apical margin or at the outer 
angle. "l'he near universality of this character among the Grapsaled 
is proof of its importance, and sustains us in removing from along side 
of the Gonoplacida the Macrophthalmi. ys 
The Macrophthalmus and Ocypod groups are closely related, and. x 
with -Doto make our second family the MACROPHTHALMIDE,—Ccharacter- E 
ized by the great length of the eye-peduncles, the very narrow front, | 
and the 2nd joint of the male abdomen narrower than the correspond- 
ing part of the sterpum. 
The GRaPsus family—the third has the same limits as in the system 
of Milne Edwards. "The form is subquadrate, with the lateral margin 
anteriorly: more or less acute; the front broad ; the eyes of moderate 
length or short; the second joint of the male abdomen usually not nar. . 
rower than the corresponding part of the sternum. . We give more im- 
portanee than has hitherto been done to the fact of the outer. maxilli- 
peds having au oblique piliferous crest on the surface or not; and we ; 
make this charaeteristic the basis of a subdivision of the Grapsid:e (ex- 4 
clusive of the Plagusinz) into the subfamilies Grapsine and Sesarmine, 
O7 
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