PH.EDRA KIN AH ANT. 213 



those of this species, except, perhaps, the middle scale 

 of the tail. Possessing, however, only a single speci- 

 men, which had been mounted for the microscope before 

 we received it, we have not been able, from its position, 

 to ascertain the precise form of this appendage. We 

 assume it to be single, with a central cleft ; but a small 

 notch at the extremity of each division is very con- 

 stantly associated with a double tail-piece, so that it is 

 not impossible that this may be found to be the case in 

 the species now under consideration. 



The colour of the animal, when received by us, was of 

 a reddish yellow. 



The accompanying vignette represents a view of Ailsa 

 Crag, from a sketch kindly lent to us by our friend Dr. 

 Scott of Melby, Shetland. 



