PORTUNUS DEPURATOR. 
Tas. [X.---Fig. 1---2. 
P. (««.) testa subcomplanaté lineis elevatis et transversis abbreviatis e granulis compositis, 
utrinque dentibus quinque: secundo breviore: postico subremotiore: fronte dentibus 
tribus: medio subacutiore sublongiore, manibus supra unidentatis, tarsis posticis apice 
acutioribus sepé subemarginatis. 
Cancer depurator. Linn. Syst. Nat. xii. 1043. 23. 
Cancer depurator, var. Penn. Brit. Zool. iv. tab. 4. fig. 6. A. 
Portunus depurator. Fabr. Suppl. Ent. Syst. 365. 9. 
Leach Edinb. Encycl. vii. 390. 
Trans. Linn. Soc. xi. 317. 
Fig. 1. Portunus depurator mas mag. nat. 2. maris abdomen. 
The sculpture of the shell of P. depurator, whichis by far the most common species that inhabits 
the British Coast, varies considerably in degree. The second and third joints of the abdomen 
of both sexes (especially of the male) are acutely carinated transversely. The abdomen of the 
male is triangular; of the female broad ; the cilia which surround it being very long, the third, 
fourth, fifth, and sixth joints are broader than the two first: sides of the sixth acute ; the 
seventh abruptly narrower than the one before it. 
It is often eaten by the poor of London, 
PORTUNUS LIVIDUS. 
Fig. 3---4. 
P. («+.) test complanata tenué subgranulata utrinque dentibus quinque : secundo subbreviore : 
postico remotiore, fronte dentibus tribus acutis: medio longiore, manibus supra uniden- 
tatis, tarsis posticis apice abrupté productis. 
Cancer depurator. Penn. Brit. Zool. iv. tab. 2. fig. 6. 
Portunus lividus. Leach Edinb. Encyel. vii. 390. 
Trans. Linn. Soc. xi. 317. 
Fig. 3. Portunus lividus mas. 4. maris abdomen. 
This species most resembles p. depurator, from which it differs in having the shell narrower 
behind, with the surface minutely granulated, the eyes tooare smaller and the antenne shorter. 
I found a single specimen amongst a number of the preceding species that were taken in the 
Frith of Forth, at Newhaven, and observed another in the collection of Montagu. 
