32 CRUSTACEA. 



widened form of the fore-part of the shell, as well as in their ocular 

 pedicles, which, like those of the Podophthalmi, are long and slen- 

 der, extending to the anterior angles, and inserted near the middle 

 of the front. The claws of the males are long and cylindrical: such 

 is the 



Gonoplax, Leach. 



Two species of which are found in European seas; one of them, 

 however, may possibly be a mere variety of the other. 



The first Cancer angulatus, L.; Herbst., I, 13; Leach, Ma- 

 lac. Brit., XIII, has the anterior angles of its shell prolonged 

 into a point, and a second, but smaller spine behind. Two 

 others are observed on the claws of the males, one on the joint 

 called the arm, and the other on the internal side of the carpus; 

 the hands are elongated, and somewhat narrowed at base; ano- 

 ther tooth is found on the superior extremity of the thighs of 

 the other feet. The body is reddish. It inhabits the western 

 coast of France, and that of England. 



In the second Cancer rhomboides, L., the shell presents no 

 other spines than those formed by the prolongation of the ante- 

 rior angles. The body is smaller, and of a reddish-white or 

 flesh colour. From the rocky localities of the Mediterranean(l). 

 In the second division of the Quadrilatera, the fourth joint of the 

 external foot jaws, or those which cover the other parts of the mouth 

 below, is inserted in the middle of the extremity of the preceding 

 joint, or more outwardly. 



Sometimes the shell is trapezoidal or ovoid, or is shaped like a 

 heart truncated posteriorly. The ocular pedicles, inserted at a short , 

 distance from the middle of its anterior margin, extend to its ante- 

 rior angles, or even beyond them. 



Commencing with those whose shell is transversely quadrilateral, 

 widened before and narrowed behind, or which has the form of an 

 egg, we first observe the 



Macrophthalmus, Lat. 



Where the shell, as in the Gonoplaces, is trapezoidal and the claws 

 are long and narrow; the ocular pedicles are slender, elongated, 

 and lodged in a groove under the anterior margin of the shell. The 

 first joint of the intermediate antennae is rather transverse than lon- 

 gitudinal, and the two which terminate them are very distinct and 



(1) See the article lihombille, Encyc. Methodique. 



