342 COOKE : ON THE MACANDREW COLLECTION. 



following Jeffreys, I have not been able to recognize Donax 

 truncuhcs L. as an English species, while the reverse has been the 

 case with regard to Thi-acia villosiuscula Macg., which he regards 

 as a variety of T. papyracea Poll. 



In not a few cases, the names given in the following list 

 differ from them in Jeffreys'. Sometimes this difference arises 

 from a wish to avoid an alteration on the corresponding card, 

 sometimes because the name already on the card seemed rather 

 better known than that given in Jeffreys' list. Thus Pecten sep- 

 temtadiatiis Miill. in Jeffreys', appears in this list as P. Danicus 

 Chem. ; Area pectunculoides Scacchi, as A. raridentata S. Wood; 

 Cardium exiguum Gmel., 2^% C. pygmceumV>oxi.; Venus gallinaL,., 

 as V. striatida Don.; Tellina balthica L., as T. solidula, Pult.; 

 etc. For the same, or similar reasons, Venus exoleta L., and 

 Venus lincta Pult., retain their generic names oi Artemis, as being 

 better known thereby; Gastrana fragilis L., as Dvodonta fragilis ; 

 Cya^nium minutum Fabr., as Turtonia mi nut a ; while I have kept 

 the name of Syndosmya in preference to Scrobicularia, to denote 

 the four polished or iridescent species (prismatica, nitida, alba 

 and tenuis), restricting Scrobicularia, as is more usual, to piperata 

 alone. 



One word about the localities. Cases are quite rare where 

 no locality has been given, and in the ensuing list I have always 

 noted the fact. But what detracts greatly from the value of the 

 localities as a whole, is the persistent recurrence of such labels as 

 •'Anglesea, etc.," "Liverpool, etc.," which of course renders un- 

 certain the exact home of all the specimens on that particular 

 card. Still, as a rule, these most unscientific labels only appear 

 in the case of species tolerably common, whose distribution is 

 well known, and the determination of whose precise locality is of 

 no scientific moment. 



J.C, iii;, July, 1882 



