Messrs Leslie & Herdman on Invertelrata of Firth of Forth. 277 



MOLLUSC A. 



This list comprises the true Mollusca only. Of the groups 

 which were formerly united under the title Molluscoida, and 

 which are now generally regarded as members of the exten- 

 sive and somewhat heterogeneous type Vermes, the Polyzoa 

 and Tunicata have already been considered; while of the 

 third, the Brachiopoda, there are no living representatives in 

 the Firth of Forth. 



On account of the comparatively advanced state of our 

 knowledge of Molluscan faunas, and the special share of atten- 

 tion which is usually given to the group by collectors, we 

 have reason to believe that this is more nearly complete than 

 any of our other lists. 



The nomenclature and arrangement are those given in 

 Gwyn Jeffreys' well-known work.* We have frequently, 

 however, mentioned also synonyms used by Forbes and 

 Hanley ("A History of the British Mollusca," 1853), and 

 other authors, especially when these were the names under 

 which the species had been recorded from the Forth. 



Dr M'Bain's extensive catalogue i* was the foundation of 

 the present list. The Mollusca of the German Expedition of 

 1872, v/hich we have already had occasion to refer to several 

 times, were reported on by Metzger and Meyer,| and we are 

 indebted to their work for the localities of several species, 

 five of which had not previously been recorded from the 

 Firth of Forth. 



Mr F. M. Balfour, F.E.S., has kindly given us a list of a 

 few Mollusca which he dredged in the neighbourhood of 

 Dunbar, including one of the rarest species in our list, 

 Pleurophyllidia loveni. 



We desire to express our thanks to the Eev. J. M'Murtrie, 

 M.A., for much valuable assistance. He kindly revised our 

 MS., and from his notes added species, localities, and remarks, 

 which, coming from one with his wide knowledge of British 

 shells, and experience of the conchology of the Firth of 



* " British Conchology," by J. Gwyn Jeffreys, F.R.S. London, 1863. 

 t "The East Neuk of Fife," by the Kev. Walter Wood. Edinburgh, 1862. 

 ± Jahresb. — VIII., Mollusca. 



