CRUSTACEA. 679 
Compare on this genus TH. BELL Observations on the genus Carcinus &e. 
Transact. of the Zool. Soc. 1. 4, 1835, pp. 335—342, Pl. 43—47. 
Add genera: Gonoplaw Lracu, Pilumnus Leacn, Xantho Leacnu, 
and some others proposed by Dr Haan, 
Portunus DALD., Far. Shell depressed, posteriorly truncated, 
mostly transverse, broader than long. ‘Two last feet natatory, with 
tarsus depressed, flat. 
A. Two posterior fect alone natatory. 
Carcinus Leacu. ‘Tarsus of fifth pair of feet narrow, lanceolate. 
Petioles of eyes short. 
Sp. Carcinus menas, Cancer menas L., BastER Natuwrk. Vitsp. u. Tab. 1, 
Brut Brit. Crust. p. 76; the shore-crab ; forward between the eyes the 
shell has three points, and on each side at the margin five triangular teeth. 
This crab is very common on our shores, 
Portunus Leacu. ‘Tarsus of fifth pair of feet dilated, oval. 
Petioles of eyes short. 
Add sub-genus Thalamita Larr. and genus Lupa LEACH in part. 
Sp. Portunus puber Leacn, Cancer puber L., Desmar. Crust. Pl. 5, fig. 1, 
Bein, Brit. Crust. p. go. 
Podophthalmus-Lau. ‘Tarsus of fifth pair of feet dilated, oval. 
Peduncles of eyes cylindrical, very long, produced as far as the 
angles of shell, received in a canal in the margin of shell. Shell 
short, transverse, depressed, on both sides at the anterior angle bi- 
spinose. 
Sp. Podophthalmus spinosus Lam., Latr., Portunus vigil Fasr. Suppl. 
Entom. syst. p. 363, DesmAR. Crust. Pl. 6, fig. 1, Guirin Iconogr., Crust. 
Pl. 1, fig. 3; from the Indian Ocean. 
B. Four pairs of feet natatory, with tarsus foliaceous. 
Platonychus Larr. (and Polybius Leacu, and species of genus 
Lupa Leacu, sub-genus Neptunus De Haan). 
Sp. Polybius Henslowii Luacn, Drsmar. Crust. Pl, 7, fig. 1, Bein Brit. 
Crust. p. 116. 
Lupa pelagica Leacu, Cancer pelagicus L., Rumen. Amb. Rariteith. 
Tab. vu. fig. R, Desmar. Crust. Pl. 6, fig. 2, De Haan Crust. Jap. PI. 
IX. X.; this beautiful species with smooth shell running into a sharp point 
on each side between the second and third pairs of feet, is found in the Red 
Sea, the whole Indian Ocean, and especially on the coast of Japan, where 
it is very common, and a favourite food of the natives. 
