Scientific Intelligence. 
the former characterized by the absence of this crest. .À survey of 
the groups will at once show, we believe, that we follow natural lines 
in this subdivision. The :Plagusine are distinguished by longitudinal 
sinuses in the front of the carapax for the inner antenna. 
The family GEcaRcriNIDE—the fourth—is the same in limits as the 
* Gecarciniens" of Edwards,—the species are remarkable for their 
thick obese forms, high rounded front and antero-lateral margin, and 
for having the second | joint of the male abdomen but slightly narrower 
than the corresponding part of the sternum. 
The family PixNorBERIDZ—the fifih—differs from the ** Pinnothe- 
riens? of. Edwards, in the removal of the genus Doto, closely related 
to Ocypod, and also the genus AMyctiris, an aberrant form between 
Pinnothera, Doto and Helccius, but very peculiar in being narrow an- 
teriorly, and having no distinct orbits for the retraction of the eyes. 
The genus Myctiris constitutes the last or sixth family Mvcrinipnz. ln 
the Pisiiborigz" the male abdomen is much narrower than the ster- 
num behind, which character separates them from the Gecarcinidee. 
We do not believe in a properly lineal order in classification ; yet 
the succession we have given to the families is a natural succession, as 
nearly as can be made.  T'he first, Gonoplacidz, link the Grapsoidea 
with the Caneroidea, and the genus Eucrate is very near Eriphia and 
Panopzus in form. "The second, Macrophthalmidz, is closely allied 
to the first, so much so that Marophthalmus and Gonoplax have been. 
arranged in the same group. "The third, Grapside, are again very 
near the Macrophthalmidz, and the genus Helice is almost as correcily 
ced with one as the other. "Thence the transition is as gradual also 
to the fourth or Gecarcinidze, and from the fourth to the fifi or Pinno- 
theride, and from the fifth to the szzth or Myciridee. — Sull, there are 
other relations of somewhat less prominence which this ordér does not 
exhibit. 'lhat of .Elamena to Inachus has long been recognized. 
The Gonoplacidz are placed in the Cancer group by DeHaan, who 
neglected the important distinction based on the male verges. "The 
other genera, exclusive of Pinnothera and the species related, he divides 
into two groups, the Ocypus and Grapsus groups, the former having the 
fourth joint of the outer maxillipeds articulated with the outer angle of 
the third, and the latter, articulated with the middle of the apical mar- 
gin ;—a distinction difficult to carry out and dividing natural groups, as 
the Gecarcinidzs, Grapside, &c. His genera of "QE OcvPus group, 
are, Doto, Scopimera, Myctiris, Gelasimus, Macrophthalmus, Cleistos- 
toma, Cardisoma, Cbasmagnathus, Helice, Uca, Ocypoda, Acanthopus 
(a division of Plagusia) ; those of the Gna»Psus group, are, Gecarcinus, 
Philyra (division of Plagusiaj, Plagusia (another division), Grapsus, 
T'richopus, Eriocheir, Pachysoma, Goniopsis, Platynotus, Brachynotus, 
Nautilograpsus, Cyclograpsus, and in his ** Decas Septima," published 
in 1849, he unites with the group, Pinnotheres and Hymenosoma. 
We add a few words on the genera of GRaPsipz. Both De Haan* 
and Randallt have divided the Grapsus of authors into two genera, ac- 
cording to the short or oblong form of the third joint of the outer max- 
* Faun. Japon. p. 33, 1833. 
1 Jour. Acad. Nat. Sci, Philad., viii, 124, 126. 
