220 DUBLIN UNIVERSITY 



been introduced by the present river, in which it is a living species. 

 There were found near them some rolled Lias fossils and a few marine 

 shells, the names of which are detailed below. 



Of the shells of non-molluscous animals, the following may be noted : 



Crcusia verruca (Leach). 



Two or three specimens of this Cirrhiped occurred on a Pecten 

 op&rcularis. It is enumerated amongst the Fauna of the neighbourhood. 



Balanus. 



Two species of this genus occurred not unfrequently. I do not know 

 their specific appellations. They are both found recent in the bay. 



Terebella conchilega. 

 I met with a number of the habitations of this species in the light- 

 house deposits. It is distributed in the living state in the bay. 



Pectinaria lelgica (Pall), 

 The agglutinated sandy habitation of this Annelid was met with on 

 one occasion. The species is a common one in the harbour. 



Serpula vermicular is. 

 One or two clusters of this species occurred to me in the light-house 

 deposits. It is one of those which live in the bay at present. 



Serpula triquetra (Linneus). 

 A mass of shells of this species was found attached to a Pecten. It 

 is constantly met with, recent, in the bay. 



Gastrochama modiolina (Lamarck).* 

 Two portions of the curious flask-like tubes of this species were 

 found in the deposits. It is not known as living in the bay ; but I have 



* This species added in the Press. 



