KOTES ON CHASTER GLACIALIS. 269 



years ago, before the Society had commenced the 

 regular publication of its Proceedings, I exhibited 

 a specimen of P. pluvnda, which had been taken at 

 the same place and under conditions similar to those 

 above referred to. At that time the species Avas 

 considered rare by us, and so far as it has come 

 under my own notice it may still be considered so. 

 The picking up of animals of that kind, however, 

 only now and again, is no proof that they ai'e rare, 

 for when we have become better acquainted with 

 their habit:*j and learned where to search for them, 

 we may find that they are not so rare as former 

 experience had led us to believe. 



Jeffreys says that the habitat of this species is 

 mostly under stones at low-water, but occasionally 

 in the laminarian and coralline zones.* Forbes and 

 Hanley state that it lives between tide-mark, and 

 that although seldom taken it appears to have a 

 wide range of distribution, e.g., Exmouth, Guernsey, 

 Salcombe Bay, Milford Haven, Isle of Man, Sound 

 of Skye, Scarborough, Coast of Northumberland, and 

 Malbay (West Coast of Ireland).! 



1 may mention that Pleurobranchus memhranaceus, 

 Mont., was often taken in the dredgings of the 

 Medusa in the Firth of Clyde. 



Uraster GLACIALIS, Linn. 



[Read 80th September, 1890.] 



So far as I know, it is an unusual or perhaps 

 even an unrecorded occurrence for this species to 

 have more than live rays. The example under notice 

 was taken in about six feet of water off the east 

 side of the Castle, Little C umbrae. When newly 

 taken, the rays and disk were cream-coloured, with 

 the exception of about an inch of bright reddish 

 purple at the extremity of each ray, the colour 

 increasing in intensity as it reached the end of the 



* JeflFreys, British ConchoJogy, vol. v., p. 12. 



t Forbes and Hanley, British Moll-usca, vol. iii., p. 561. 



