PORCELLANA. 79 



croura. Fifth pair of legs filiform, small, folded up above 

 the others. Sternal plate very wide, and nearly circular. 



Gen. 26. PORCELLANA, Leach. 



Carapace as wide as long, suborbicular, and depressed 

 above. Eyes small. Outer antennae very long. Outer 

 jaw-feet very large. Eront legs very large, and more 01 

 less flattened. Abdomen wide, folded under the carapace 

 on the sternum, of seven distinct rings, and with a terminal 

 swimming-fin of five plates. 



Porcellana platycheles, Perm. sp. Broad-clawed 

 Crab. (Plate V. fig. 4.) — Hands wide and flattened, their 

 claws triangular. Eorehead projecting, and divided into 

 three flattened teeth, the middle one not grooved; second, 

 third, and fourth pairs of legs hairy. 



Common on the coast, under stones. 



Mr. Kingsley* gives the following picture of this Crab : 

 — " Turn a few stones which lie piled on each other at ex- 

 treme low-water mark, and five minutes' search will give 

 you the very animal you want, — a little Crab, of a dingy 

 russet above, and on the under side like smooth porcelain. 

 His back is quite flat, and so are his large angular fringed 

 * Glaucus, or the "Wonders of the Shore, p. 152. 



