7246 MoUusks. 



Chemnitzia eximia Fusus norv^egiciis 



Truncatella Montagui Mangelia altenuata 



Natica sordida 



The right of the seventeen species in the next list (and perhaps one 

 or two others also) to be admitted may also be questioned, and their 

 retention must be dependant on the results of future investigation. 



Pholas Candida Rissoa vitrea 



Tliracia pubesceus Odostoiuia plicata 



Solen luarginatus Murex Eiiiiaceus 



Syndosmya tenuis Mangelia Treveliana 



Pecten niveus Marginella laevis 



Trochus Alabastrum Pleurobranchus membranaceus. 



Eissoa costulata ^olis smaragdina 



„ semistnata Conovulus denticulatus 



„ rubra 



It must be borne in mind that the difficulties which a naturalist had 

 to contend with before the publication of ' The British Mollusca' were 

 very great, and errors in nomenclature consequently frequent, even in 

 the best cabinets j and this was especially the case with respect to the 

 more critical and minute species. The exotic shells — unless the errors 

 consisted in nomenclature — and the South British forms may have 

 been transported to the Clyde in ballast, a most prolific source of aliens 

 in years gone by, while five of the species formerly admitted were 

 post-tertiary fossils. 



Excluding the thirty-four above-mentioned species'from the list, the 

 number of Mollusca inhabiting the Firth of Clyde will be found to be 

 three hundred and five. 



The " Clyde Province " may be divided into three subprovinces : — 

 1. The Firth of Clyde; 2. Loch Fyne (including Kilbrannau Sound); 

 3. The North Channel. The first of these subprovinces forins the 

 subject of the present paper. Subjoined are lists of the Mollusca which 

 have been met with in the last two subprovinces, but which have not 

 as yet been noticed in the Firth of Clyde. 



Loch Fyne. 



Cynthia quadrangularis Tellina proxima (fossil) 



♦Neaera costellata *Syndosmya intermedia 



* „ abbreviata - *Lucina ferruginosa 



Pandora obtusa Nucula decussaia 



* These species have been met with by myself; the rest are inserted on the 

 authorities given by Forbes and Hanley. 



