CRUSTACEA. : 669 
Aiglea LEACH. 
Sp. Aglea levis, Galathea levis Latr., Encycl., Hist. nat. Crust. Pl. 308, 
fig. 2, Desmar. Crust. Pl. 33, fig. 2. 
Porcellana Lam. Middle antennz very short, hidden beneath 
frons, with double seta, external long, terminated by a multiar- 
ticulate seta, and without scale at the base. First pair of feet didac- 
tylous, large, depressed, with chela large; fifth pair of feet slender, 
recurved, Shell depressed, suborbicular. Tail reflected under 
thorax. 
Sp. Porcellana longicornis LAtR., Cancer longicornis PENNANT, Encycl. méth., 
Ins. et Crust. Pl. 275, fig. 3, Bexu Brit. Crust. Pl. 193; in the Baltic, 
also on our coasts. This genus forms the'transition to the Decapoda 
brachyura. LEACH distinguishes this and some other species of Porcellana 
by the name P2sidia, as a separate genus. 
Family XXIX. Lortcata (Locuste Latr.). Four antenne 
inserted almost in the same transverse line, middle filiform, bisetose 
at the apex, external without scale at the base. Feet monodacty- 
lous, subequal. Sternum broad posteriorly. Shell hard. 
Palinurus Daup., Far. External antenne setaceous, very 
long, thick at-the base, aculeate. Shell muricate. Eyes large, 
approximate. 
To this genus belong different species of large crustaceans, which in- 
habit rocky places in various seas. In the Mediterranean is found Pali- 
nurus vulgaris LATR., Cancer homarus L. (excl. Synon.), Dusmar. Crust. 
Pl. 32; the Greeks named this animal xapafds, the Romans locusta, from 
which the French name langouste is derived. The flesh and also the eggs 
of these crays are renowned as delicacies. Amongst the exotic species, 
there are many of which the internal antennz have two long filaments, as 
Palinurus guttatus Latr., Encycl., Ins. e Crust. Pl. 315, from the West 
Indies, Pal. japonicus V. SIEBOLD, Dr Haan Faun. japon., Crust. Tab. 
41, 42, &e. 
Scyllarus Fasr. Lateral antenne without filament, peduncles 
with joints foliaceous, plane, broad. Eyes mostly very remote. 
Fifth pair of feet in females subchelate, with two small fingers. 
Sp. Scyllarus arctus Fasr., Cancer arctus Li. (excl. Synon.), SutzER Gesch. 
der Ins. Tab. 32, fig. 3, Cuv. R. Ani., éd. ill., Crust. Pl. 45, fig. 1; in the 
Mediterranean. In Scyllarus orientalis Fasr., the eyes stand still further 
apart, entirely at the margin of the shell, which is very broad forwards 
and becomes narrower backwards. RumpH. Amb. Raritk. Tab. u. fig. D, 
Desmar. Crust. Pl. 31, fig. 1. This species forms the genus Thenus 
Leacu. In some species from foreign seas the eyes are placed more in the 
