CRUSTACEA. 669 



a LEACH. 



Sp. JEglea Icevis, Galathea Icevis LATB., Encycl., Hist. not. Crust. PL 308, 

 fig. 2, DESMAB. Crust. PL 33, fig. 2. 



Porcellana LAM. Middle antennae 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 LATB., Cancer longicornis PENNANT, Encycl. meth., 

 Ins. et Crust. PL 275, fig. 3, BELL Brit. Crust. PL 193 ; in the Baltic, 

 also on our coasts. This genus forms the transition to the Decapoda 

 brackyura. LEACH distinguishes this and some other species of Porcellana 

 by the name Pisidia, as a separate genus. 



Family XXIX. Loricata (Locustm LATR.). Four antennae 

 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 DALD., FABR. External antennoe 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 LATE., Cancer homarus L. (excl, Synon.), DESMAR. Crust. 

 PL 32 ; the Greeks named this animal /ca/)ct/36s, 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 antennae have two long filaments, as 

 Palinurus guttatus LATB., Encycl., Ins. et Crust. PL 315, from the West 

 Indies, Pal. japonicus V. SIEBOLD, DE HAAN Faun, japon., Crust. Tab. 

 41, 42, &c. 



Scyllarus FABR. Lateral antennae 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 FABB., Cancer arctus L. (excl. Synon.), SULZEE Gesch. 

 der Ins. Tab. 32, fig. 3, Cuv. R. Ani., ed. ill., Crust. PL 45, fig. I ; in the 

 Mediterranean. In Scyllarus orientalis FABB., the eyes stand still further 

 apart, entirely at the margin of the shell, which is very broad forwards 

 and becomes narrower backwards. KUMPH. Anib. Raritk. Tab. II. fig. D, 

 DESMAR. Crust. PL 31, fig. i. This species forms the genus Thenus 

 LEACH. In some species from foreign seas the eyes are placed more in the 



