376 Quarterly Journal of ConcJioIogv. 



recently published by Mr. Robertson embracing the vdiole area of 

 the west of Scotland), which is intended as a guide to the 

 moUusca of the Firth, as limited by a line drawn from the south 

 end of Kintyre to the heads of Ayr, 



No less than 353 species are mentioned in this work as 

 having been recorded from the locality; of this number Mr. 

 Brown excludes 63 as not suflrciently and satisfactorily proved 

 to be inhabitants of the firth. 



Of the 290 admitted species 2 belong to the Bradiiopoda, 

 95 to the Concliifcra, 2 to the Soknoconchia, 13S to the Gastropoda, 

 and 3 to the Cephalopoda, the whole of which with the exception 

 of Rissoa abyssicola, Isocardia cor, Area ladea, Litorina fieritoides, 

 Scalaria coDimunis, and some of the NudibraiicJis have passed 

 through the author's hands; the list may therefore be relied upon 

 as thoroughly accurate and trustworthy. 



The greatest care has been taken to exclude alien species, 

 the difficulties in the way being considerably lessened by the 

 stringent regulations- preventing ballast being thrown into the 

 channel by vessels entering the ports. 



Two well known species (Pecten islandicus and Saxicava 

 Norvegica) are occasionally found in a more or less perfect state, 

 doubtless washed out of the glacial clays. 



The nomenclature adopted is that of Dr. Jeffreys', the most 

 important synonyms being given under the head of each species; 

 those also are indicated that are known to have been found in 

 the Scottish Post-tertiary deposits. 



The habitats are given with a carefulness and accuracy that 

 cannot be commended too highly, adding also considerably to the 

 value of the work. 



The British and foreign distribution is given full}', the foreign 

 stations being authenticated by the names of the authorities 

 being appended. 



