PALJBMON LEACHII. 307 



DECAPODA. PALMMONIDJE. 



MACEOURA. 



Palamon Leackii. 



Specific character. Rostrum nearly straight, with five or six teeth above, and 

 three beneath ; one only of the former situated behind the line of the ocular 

 notch ; apex generally emarginatc. 



AMONGST the smaller Pal&monida found in Poole Har- 

 bour, to which I have already alluded as being sold there 

 under the name of " cup-shrimps," there are found a con- 

 siderable number which differ materially in the form of 

 the rostrum, as well as in the number of teeth with which 

 it is furnished, from either of the species hitherto described. 

 I have thought right to describe it as a distinct species, 

 which I cannot doubt to be correct. It differs from 

 P. Squilla in the smaller number of the teeth in the 

 upper crest of the rostrum, and in the fact that one of those 

 teeth only is placed posterior to the ocular notch. From 

 P. varians it is more obviously distinct. 



Of twenty specimens taken promiscuously, the number 

 of teeth on the upper and under edges of the rostrum were 

 as follows : ten had f , seven J, two , and one had only 

 two teeth beneath. The normal number, therefore, may 



be considered as . 



x 2 



