216 DUBLIN UNIVERSITY 



Littorina tenebrosa {Montagu). 

 Was met with rather frequently. "We cannot still enumerate it among 

 the Fauna of our neighbourhood, being only found in the dead state. 



Littorina littoralis (Linneus). 

 This species, designated so long by the Linnean epithet Neritoides, 

 which was really bestowed upon a distinct shell, occurred pretty fre- 

 quently, but in nothing like the numbers that one should expect of a 

 mollusc so prolific in the bay at present. 



Lacuna crassior (Montagu). 



Was distributed in some numbers throughout the deposits. In the 

 bay it is still found in the living state. 



Rissoa labiosa (Montagu). 

 Was found very frequently in the beds in company with Cerithium 

 reticulatum. In the harbour this species still abounds. 



Rissoa ulvce (Pennant). 

 Common in the deposits. Many individuals attained a length of 

 five-sixteenths of an inch. It is thrown upon the shore in a living state 

 in multitudes. 



Turritella communis (Risso). 



This species, perhaps better known under the appellation Terebra, 

 was scattered throughout the deposits in countless myriads. In gardens 

 within the town it occurs constantly in the soil. One extremely large 

 example, found by David Grainger, Esq., of Liverpool, measured 2f 

 inches in length, and fths of an inch in its greatest breadth. I am sorry 

 to say that at the Meeting of the British Association in 1852, this beau- 

 tiful specimen was abstracted from a drawer-full of examples of the post 

 tertiary shells of Belfast which I had been exhibiting to Section D. If 

 this should meet the eye of the delinquent, I hope that, conscience- 

 stricken, he will return the shell to the owner, and "no questions 

 shall be asked." It occurs in abundance in the harbour at present. 



Aporrhais pespelicani (Linneus). 

 Was a very abundant shell in the blue clay. It is still an inhabitant 

 of the neighbourhood. 



