HJPPOLYTE IMNDALIFORMIS. 295 



size and sliglitly curved ; the external pedipalps slender 

 and pediforni ; the anterior pair of feet about two-thirds 

 the length of the second ; the wrist of the latter six-jointed, 

 the third joint about twice the length of each of the 

 others ; the reraainino- leos long and slender. The abdo- 

 men is more slender than in any other species of Hlppolyte 

 with which I am acquainted ; the terminal joint narrow 

 and acutely pointed. 



Total length an inch and a half. 



The resemblance of this species to Pandalus annuUcornis 

 is so remarkable, that I have given it a specific name in 

 accordance with that relation, in order to record its pro- 

 bable situation as leading from the normal forms of the 

 genus towards Pandalus. It is strikingly abnormal as 

 regards its own genus. The general slenderness of the 

 whole body, the even form of the carapace, the length and 

 form of the rostrum, the length of the legs and antennae, 

 all exhibit a marked tendency in the direction alluded to. 

 It is, however, in all its essential characters, a true Hip- 

 polyte. 



This constitutes another interesting addition to our native 

 Crustacea, which we owe to the labours of Mr. M'Andrew 

 and Professor Forbes, by whom it was dredged in Loch 

 Fyne, at a depth of about twenty fathoms. 



I have two specimens, for which I am indebted to those 

 gentlemen, and this is the only instance in which its 

 occurrence has been recorded. 



