148 On Pemphix, Glyphea, and Areosternus. 
length and breadth in proportion to their distance from the 
first pair. All the legs are formed like those of the Palinurt. 
The outer surfaces of all the legs are furnished with small 
tufts of hairs, and the upper and lower margins with very 
long yellow hairs. . 
The abdomen resembles that of Palinurus; it is a little 
longer than the carapace. ‘The sixth segment of the abdo- 
men likewise perfectly resembles that of the Palinurt; and its 
lateral appendages form, with the seventh segment, the caudal 
fin. ; 
The above is a brief summary of the peculiarities of this 
remarkable Crustacean; for more ample information I refer 
the reader to M. De Man’s memoir. ‘This naturalist, having 
had the politeness to send me a fine figure of his specimen of 
Areosternus Wienecket, accompanied by some remarks, I find 
myself in a position to add some further particulars to 
the description inserted in the ‘ Notes from the Leyden 
Museum.’ ari . 
The author writes to me as follows :—‘‘ My Areosternus 
cannot be associated with any existing genus of Macrurous 
Crustaceans known to me, and this for the following reasons : 
—It differs from the Carides by the absence of a protective 
Jamella on the peduncle of the outer antenne, from the Asta- 
cides (Homarus, Astacoides, Astacus, Nephrops, Paranephrops, 
Enoplometopus, &c.) for the same reasons and because all 
the legs are monodactyle, from the fossil Eryonides for the 
same reasons ; from the Palinurides (Palinurus) on account 
of its non-triangular sternum not widened in the posterior 
part, and on account of the different structure of the cepha- 
lothorax; from the Scyllarides for the reasons mentioned 
under the Palinurides, and, further, because the outer antenne 
are not lamellar; from the anomobranchial Thalassinides (Cal- 
lianides &c.) by the monodactyle feet; from the Thalassine 
by the broad and not linear lateral lamelle of the penulti- 
mate segment of the abdomen; from the Callianassides (.Cal- 
lianassa, Trypea), because the outer jaw-feet are not lamelli- 
form, and by the monodactyle feet &c.; from the genera 
Glaucothoe, Laomedia, Calocaris, and Anius, which belong to 
the subbranchial Thalassinides, by the monodactyle feet and 
several other differences; from the genus G'ebéa by an en- 
tirely different habit, by the form of the front, by the eyes 
being lodged in a sort of orbit, but especially by the struc- 
ture of the antenne: in Gebza the peduncle of the outer an- 
tenn is composed of several joints, while the flagellum of 
the inner antenne is much longer than the peduncle ; in 
Areosternus this part is much stouter than the peduncle. 
