DECAPODA. 
191 
much smaller than the preceding ones. The under part of the tail is 
never furnished with more than four pair of appendages or false 
feet *. The lateral fins of the end of the tail, or the pieces whicli 
represent them, are thrown on the side and do not form with the 
last segment a flabelliform fin. 
The ocular pedicles are generally longer than those of the Ma- 
croura belonging to the following sections. 
Here (the Hippides, Latr.), all the superior teguments are solid. 
The two anterior feet sometimes terminated in a inonodactyle hand, 
or one without a finger, in the manner of a palette, and sometimes 
in a point; the six or four following ones end in a fin; the two last 
are filiform, reflexed, and situated at the inferior origin of the tail. 
The latter becomes suddenly narrowed immediately after the first 
segment, which is short and broad ; the last is in the form of an 
elongated triangle, and the lateral appendages of the penultimate in 
that of curved fins. There are four pairs of sub-caudal appendages, 
composed of a very slender and filiform stem. The antennae are very 
pilose or strongly ciliated ; the lateral first incline to the intermediate, 
and are then arcuated or contorted outwards. 
Albunea, Fahr. 
The two anterior feet, terminated by a very compressed triangular, 
inonodactyle hand ; the last joint of the following ones falciform. 
The lateral antennae are short, and the intermediate ones are termi- 
nated l)y a single long and setaceous filament. The ocular pedicles 
occupy the middle of the front, and form, together, a sort of flat trian- 
gular snout, with the external sides arcuated. The shell is almost 
plane, and nearly square ; the posterior angles are rounded, and their 
anterior margin finely dentated. 
The only well known species. Cancer symnista, L, ; Albunea 
symnista, Fabr,. Herbst., XXII, 2 ; Desmar., Consider., xxix., 3, 
inhabits the Indian Ocean f. 
If the Cancer carabus of Linnaeus belong to the same subgenus, a 
species would be found in the Mediterranean. 
Hippa, Fab . — Emeuita, Gronov. 
Tlie two anterior feet terminated by a strongly comj^ressed, 
nearly ovoid and adactyle hand : the lateral antennae much shorter 
than the intermediate, and contorted ; the latter terminated by two 
short, obtuse filaments placed one on the other ; the ocular pedicles 
long and filiform, and the third joint of tlie foot-jaws very large and 
* With the exception of the two that are anterior, these appendages in the males 
are mere rudiments, or are even wanting, a character common’ to the Galatheoe 
Scyllari, and Palinuri. We should also observe that in these three subgenera the 
caudal fins are thinner or almost membranous at their posterior extremity. In this 
section, as well as in the Galathese, the thoracic portion to which the two posterior 
feet are attached forms a sort of petiole, so that these feet seem to be annexed to 
the tail. 
•h M. Desmarest hesitatingly places the genus Posi/don of Fabricius, who speaks 
of two species, near the Albuneae ; but according to the latter the anterior antennw 
are bifid, a character which does not belong to the Albunese. Owing to the imper- 
fect manner in which he describes this genus, we are not able to recognize it, or to 
appreciate its affinities. 
