4106 Crustacea. 



Purpura lapillus. Common. 

 Nassa incrassata and reticulata. General. 

 Buccinum undatum. Common. 

 Fusus antiquus. Common. 

 „ Tslandicus. Not common. 

 „ propinquus. Rare ; off Dublin Bay. 

 Trophon muricatus. Strands of Merrion, Sandy Mount, &c; and 

 dredged in Dalkey Sound and off Dublin Bay. 



„ Barvicensis. Very rare ; Dalkey Sound. 

 * „ clathratus. Off Dublin Bay. 

 Mangelia costata. General. 



„ linearis. Not uncommon ; Dalkey Sound, &c. 



„ nebula. Scarce ; Dublin Bay. 



„ rufa. Ditto. 



„ septangularis. Rare ; off Dublin Bay. 



„ glacialis. Ditto. 



„ turricula. Off Dublin Bay. 



Cypraea Europaea. Common. 

 Cylichna cylindracea. Rare ; Dalkey Sound. 



„ obtusa. Dublin Bay. 

 Tornatella fasciata. Dalkey Sound, &c. 



Scaphander lignarius. Off the bays of Dublin, Killiney and Bray. 

 Philine aperta. Not uncommon. 



„ catena. Very rare ; Dalkey Sound. 



„ scabra. Rare ; Dalkey Sound. 

 Aplysia hybrida. Rare ; Dalkey Sound. 



William White Walpole. 

 Windsor Lodge, Monkstown, 



Co. Dublin, September 27, 1853. 



Note on the occurrence of Caprella Icevis in the Moray Firth. — Recently as I have 

 sent you a list of Crustaceans found in the Moray Firth, there have already been a few 

 additions made to it : the Caprella laevis is one of them. I take this opportunity of 

 recording the habits of this animal, as observed by Mr. G. Murray, at Burghead ; and 

 this T could not do better than by quoting at length his letter to me on the subject: — 

 " I sent to you last week a strange-looking Crustacean, discovered near low-water 

 mark of a spring tide. I was prying under a huge stone in quest of Nudibranchs, 

 when, amidst the Zoophytes with which its surface was thickly covered, I observed 

 something performing a series of movements that denoted vitality, and that of the most 

 active kind. Attached by its lower extremity, and having its long slender body en- 

 tirely free, the creature bent itself into the form of an irregular hoop, bringing its head 



