PAL.SMON VARIANT. 



DEC A POD A. 



MACROURA 



309 



PALMMONIDJE. 



Palamon Varians. Leach. 



Specific character. Rostram perfectly straight, the apex entire ; above with four 

 to six teeth, beneath with two. Scale of the external antennae rounded at 

 the apex. 

 Pal&mon variatis, LEACH, Edinb. Enc. VII. p. 401. 431. Id. Trans. 



Lin. Soc. XI. p. 349. Id. Malac. Brit. t. xliii. f. 



14-1G. EDW. Hist, des Crust. IV. p. 391. 



THE absolute restriction to two teeth on the inferior 

 crest of the rostrum in this species, would distinguish it 

 from all other British species of Pal&mon, even without the 

 .additional characters of the small number of teeth on the 

 upper crest, and the entire apex. The whole rostrum is 

 perfectly straight, lanceolate, acute at the apex, as long as 

 the scale of the external antennae ; one of the teeth on the 

 upper crest is always placed a little behind the ocular 

 notch. These teeth are generally four in number, some- 

 times five, very rarely six ; beneath there are never more 

 than two teeth ; I have seen one specimen in which there 

 was only one. The external antennae are of moderate 

 length, not much exceeding that of the body ; the scale 

 anteriorly rounded, in which character it differs from 

 P. serralus. The hand of the anterior pair of feet is 

 slightly tumid ; the upper finger hairy. 



