DECAPODA. 75 



Pappenheirh and Solhnofen, frequently exhibits the debris of a fossil 

 crustaceous animal, referred by Desmarest to the Prawns, under 

 the specific appellation of spinipes Hist. Nat. des Crust. Foss. XI, 

 4. It does in fact resemble it, but the claws are wanting. A second 

 fossil species, but much larger, has been discovered in England. 



Pal. serratus, Leach, Malac. Brit. XLIII, 1, 10$ Herbst., 

 XXVII, 1, is from four to five inches long, of a pale red colour, 

 which becomes more vivid on the antennae, the posterior mar- 

 gin of the segments of the tail, and particularly on the terminal 

 fin. The rostrum extends beyond the peduncle of the interme- 

 diate antennae, is recurved at its extremity, and has five teeth 

 above, exclusive of the point, and five beneath. The fingers are 

 as long as the penultimate joint. It is found on the coast of 

 France and England, and is the species of this subgenus that is 

 more particularly sold at Paris. A sort of wen is frequently, 

 and at all seasons, observed on one side of the shell, which co- 

 vers a parasite Bopyrus, which fastens upon its branchiae. 



Pal. squilla, Leach, Malac. Brit., XLIII, 11 13$ Cancer 

 squilla, L.$ Squilla fusca, Bast., Opusc. subs., lib. 2, 111, 5, is 

 but half the size of the serratus. Its rostrum scarcely extends 

 beyond the peduncle of the superior antennae, is almost straight, 

 or but slightly recurved, is emargin.ated at the extremity, and 

 has seven or eight teeth above, and three below. The fingers 

 of the claws are somewhat longer than the hand. Common on 

 the coast of France and England(l). 

 The carpus is articulated, or presents annular divisions in the two 

 following genera, viz. 



Sysmata, Risso: ante Melicerta, ejusd. 

 Where the second pair of claws are larger than the first(2), and 



Athanas, Leach, 



In which, on the contrary, the first pair is larger than the se- 

 cond(3). The last subgenus of this section, that of 



(1) See the article Palemon, Encyclop. Method., and of the second edition of 

 the Nouv. Diet. d'Hist. Nat., and Desmar., Consid., p. 236 238. See also in re- 

 lation to the nervous system, the Mem. Cit., of Messrs Audouin and Milne Ed- 

 wards. 



(2) Lysmalu seticauda, Risso, Crust., II, 1; Desmar., Consid., p. 238. 



(3) Athanas nitescens, Leach, Malac. Brit., XLIV; Desmar., Consid., p. 239, 

 240; de lireb., Crust, du Calv., p. 23, 24. 



