CLASS r. CRUSTACEA. 85 



Inhabits the southern coasts of Devon. In France it is used as an ar- 

 ticle of food. 



b. Orbit internaUt/ slightli/ imperfect. Wrists unidentate. 



Sp. 2. For. corriigatiat. Sb.ell convex, with transverse serrate-granulate 

 ciliated lines, the side with five teeth on each side, the three hinder 

 of which are more acute; front trilobate, the lobes subgranulate-ser- 

 rate, the middle one largest; hands above, unidentate; hinder clav/s 

 with sharp points. 



Cancer corrugatus. Peiin. Brit. Zool. iv. p/. 5. fg. 9. Portunus corru- 

 gatus. Ijeach, Trans. Linn. Soc. xi. 315. — Mul. Fodopli. Brit. tab. 7. 



Jig- 1 4- 2. 

 Inhabits the British seas. 



** Hinder claws without the elevated line. External double palpi 

 with the internal apex of the second joint of the internal footstalk emur- 

 ginatc. Orbits internalli/ beneath the insertion of the antenna: imperfect. 

 Sp. 3. For. marmorcus. Shell convex, obsoletely and slightly granu- 

 lated, witli five nearly equal teeth on each side; front with three 

 equal teeth, witli rounded points; hands smooth, with one tooth 

 above; hinder tarsi with acute points. 

 Cancer (pinnatus) marmoreus. Montagus MSS. Portunus marmoreus. 

 Leach, Malucost. Podoph. Brit. tab. 8. 



This ele<!;ant species, which derives its name from its colour, was 

 discovered by G. Montagu, esq. It is very common on the sandy 

 shores of southern Devon, from Torcross to the mouth of the river 

 Ex, and is frefjuently foimd entangled in the shore-nets of the fisher- 

 men, or thrown on the shore after storms. 



Fam. III. Cancep.id.e. Jj:ac.h's MSS. 

 Anienn(z simple, short: four hinder pair of legs simple. 



Genus 6. CANCER of authors. 



External antenna short, inserted between the internal canthus of tlie 

 eye and the front; internal antenna: placed in foveolae in the middle 

 of the clypeus, with their peduncle nearly lunate: esdernal double 

 palpi with the second joint of the internal footstalk notched at the 

 internal apex: shell emarginate behind; or6/<,s behind with one fis- 

 sure, and externally with onefold: beneath with one fissure, and 

 externally with one fold : anterior pair of legs unequal. 



Sp. 1. Can. Pagurus. Shell granulated with nine folds on each side; 

 front with three lobes. 



This species is the common crab of Britain. It is considered to 

 be in season between Christmas and Easter, and about harvest, being 

 much esteemed as an article of food. Its natural history is but little 

 known. During the summer months it is very abimdant on all our 

 rocky coasts, especially where the water is deep. At low tide they 

 are often found in holes cf rocks in pairs, male and female; and if 



