TWO-SPINED SHRIMP. 269 



pressed : third pair very slender, as long as the first pair, 

 with a simple claw : fourth pair and fifth pair of equal 

 length, rather longer than the third, and somewhat thicker 

 but slender ; claws simple. Thorax, with two prominent 

 dorsal spines, one considerably behind the other, and on 

 each side a row of blunt notches. A spine at the outer 

 edge of the external plates of the tail." Mag. of Nat. 

 Hist., vol. viii. p. 273. 



Mr. Hailstone states, in his MS. notes, with which he 

 favoured me some time before his lamented death, that one 

 specimen only of this species had come into his possession, 

 which he found at Hastings in a mass of Filipora fili- 

 grana. 



