DECAFODA. 
177 
but most frequently live on their banks or on laiul. They assemble 
in great numbers, and when any one appears among them, they hurry 
to the water with a tremendous noise, caused by striking one claw 
against the other. Their habits are similar to those of other carni- 
vorous Crustacea 
G. varim, Lat. ; Cancer rnarmoratiis, Fab. ; Oliv., Zook, 
Adr., II, 1 ; Cancre nmc/re. Rondel. ; Herbst., XX, 114. Size 
middling ; nearly square, hardly broader than long ; yellowish or 
livid; greatly elongated above, and marked with numerous fine 
lines and points of a reddish brown ; four flattened projections 
arranged transversely at the base of the clypeus, and three teeth 
at the anterior extremity ot each lateral edge. The tarsi are 
spiny. The 
G. porte-pinceoM ; Cuv. Regne Aniin., IV, xii,l; Rumph., 
Mus. X, 2; Desmar., Consider., XV, 1, is remarkable for the 
numerous long and blackish hairs with which the superior sur- 
faces of the fingers are furnished. The tarsi are without spines, 
a character exclusively peculiar to this species. It is found in the 
East Indies f. 
In our fourth section or the Orbiculata the shell is either sub- 
globular, rhomboidal, or ovoid, and always very solid ; the ocular pe- 
dicles are always short or but slightly elongated ; the claAvs of un- 
equal size according to the sex, those of the males being largest ; there 
are never seven complete segments in the tail ; the buccal cavity 
grows gradually narroAver tOAvards its superior extremity, and the 
third joint of the external foot-jaAA's ahA'ays forms an elongated 
triangle. The posterior feet resemble the preceding ones, and neither 
of the latter is ever very long. In the 
CoRYSTES, Latr., 
The shell is an ovoidal oblong, and crustaceous ; the lateral antennae 
are long, projecting and ciliated ; ocular pedicles of a mean size and 
separated ; third joint of the external foot-jaAvs longer than the pre- 
ceding one, Avith a Ausible emargination for the insertion of the next. 
The tail is composed of scA’^en segments, the tAA'o middle ones oblite- 
rated in the males. 
A species — Cancer perso7ialus, Herhst., XII, 71? 72; Leach, 
Malac. Brit., VI, 1, is knoAAUi on the coast of France. The 
lateral edge of its shell is marked Avith three notches on each 
side. 
A second Avas brought from the Cape of Good Hope by the 
late Delalande. 
* See Bose, Hist. Nat. des Crust. 
-f- See the Article Playusie, Eucyc. Method., and the Histoire des Animaux sans 
vertebres of Delamarck, genus Grapse. 
X The Orythise and the Dorippes, in a natural series, -w ould, in my opinion, belong 
to this section, and lead to the Corystes ; their shell is a truncated ovoid. 
VOL, III. 
N 
