140 ROEBUCK : CONCHOLOGICAL LOCALITY-RECORDS. 



5. — That Conchologists be invited to contribute lists for the 

 different districts shown on Mr. Watson's map, subject to the 

 indispensible requirement of a vouclier-specimen for each record. 



6. — That in the case of extremely rare or unique species or 

 varieties, the voucher-specimens, after being submitted to the 

 referee, may be returned to tlie collector, instead of being retained 

 for the Club collection ; but that all other specimens be so 

 retained. 



7. — That it is desirable that, as soon as practicable, a new 

 and authentic list of British mollusca, showing provincial distri- 

 bution by figures, be prepared as a standard of nomenclature — 

 there having been several corrections of errors and additions of 

 new species and varieties made since the publication of Dr. 

 Jeffreys' book. 



8. — That the Editors of 'The Journal of Conchology' be 

 requested to accept as material for publication therein such 

 records and county-lists as may be contributed in response to 

 these suggestions. 



Should the Conchological Society do me the honor to look 



favourably upon these suggestions, I should propose that a 



a brief abstract of them be publislied in the Journal, and at the 



same time invite (through the same medium) Conchologists to 



co-operate with the Society in carrying out such a scheme for 



the ultimate benefit of Conchological science. The result would 



be, I am sure, the collection of a large quantity of thoroughly 



reliable, because properly authenticated, facts. And when a 



considerable number of such county-lists were published, the 



Journal would be a storehouse of material upon which extensive 



generalizations might be safely founded. 



PROPOSED ''MONOGRAPH OF THE UNIONID^ OF 



NORTH AMERICA." 



We hail with pleasure the announcement by Mr. Arthur F. 

 Gray, Danversport, Massachusetts, and Mr. R. Ellsworth Call, 



