GENUS CANCER. 59 



the anterior obtuse tooth also does not exist in the young, 

 but is gradually separated by a sinus from the elevated 

 external angle of the eye as the animal mcreases in size. 



2. C. irroratus. Thorax with nine crenate teeth on 

 each side; Clypeus three-toothed; hands with four or five 

 elevated hues on the external side. 



Cancer undecemdentatus? Latr. Hist. Crust, et Ins. 

 Inhabits the ocean. Common. 



Plate 4., fig. 2. 



Thorax whitish, with crowded small red granules, a 

 whitish dorsal mark behind the middle resembling the let- 

 ter H; on each side, two parallel curved lines of white dots, 

 nine or ten in each, sometimes obsolete in the old shell; 

 a few hardly raised obtuse tubercles on the disk; poste- 

 rior marginal toorh more acute, but hardly more promi- 

 nent than the others, with an indentation at its base on the 

 hind edge of the thorax; central tooth of the rostrum de- 

 pressed rather below the line of the two others; Orbits 

 orbicular, two fissures or impressed lines above and two 

 beneath, a little raised into two teeth on each side of the 

 exterior antennae and into one tooth at the posterior can- 

 thus; Thighs ciliate above, and marked by an impressed 

 band near the tips, both joints of the tibia ciliate beneath, 

 tarsi compr-SNed, acute and dteply striate. 



Carpus above spotted like the thorax, with an advanced 

 acute spine at the inner anterior angle. Hands moderate, 



* Mr. Savigny in his Ingenious work on tlie organs of the iTiouth of ^nsects 

 and Crustacea, has shown that crabs, &c., have In reality sixtetn feet, but that 

 six of them are palpif«rm and applied to the mouth. 1 have, l.owever, continu- 

 ed to make use of tlie old terms, carpus, hanil, fin^je;-, thumb, ^c.y until tha 

 terminology is settled. 



