106 PROCEEDINGS OF TUE MALACOLOGICAL SOCIETY. 



On these two plates Bruguiere grouped as Cyclas a number of 

 freshwater shells, and even the figure 3 on plate 3U2, said by some to 

 lepresent an Astarte, would equally answer for a Corbicula, and 

 Deshayes ^ observes " elle serait plus probableraent du genre Gyrene, 

 puisque Bruguiere I'a ainsi placee, mais comme elle ne montre pas la 

 charniere, nous conservons du doute ". 



It now remains to determine "what generic name should be applied 

 to the shell in (^uestiou. 



The name Arctica of Schumacher (1817) has a year's priority of 

 C>i2)rina, Lamarck, but, as pointed out by various writers, it was 

 preoccupied bj' Moehring in 1758 for a genus of birds, and therefore 

 is not available. Although Cyprina, Lamk., and Cyprinus, Linn. 

 (a genus of fislies), are very similar, the derivations 'according to 

 Agassiz,- Herrmanusen,^ Philippi,* Try on, ^ Fischer,^ Hoyle,'' etc., are 

 different. Both therefore can be employed in zoological nomenclature. 



The s} nouyray will therefore stand as follows : — 



CypKiXA IsLANDiCA (Liun.). 



1767. J'etius, Linn., part. 



1806. Cyclas, Lamk., part, (non Cyclas, Lamk,, 1799 = Sphcerium, 



Scopoli, 1777). 



1807. Cyclas, Link, (non Cyclas, Lamk., 1799). 



1817. Arctica, Schumacher (non Arctica, Moehring, 1758). 



1818. Cyprina, Lamarck. 

 1900. Cypriniadea, Eovereto. 



1903. Cyclas (Bruguiere), Link, fide Dall (non Cyclas, Brug., 1798, 

 nee Cyclas, Lam., 1799). 



^ Lamarck's Hist. Anim. sans Vert., 2nd ed., vol. vi, p. 275. 



- Nomencl. Zool. Moll., p. 28; Vertebrata. 



■' Indicis Gen. Malac, vol. i, p. 361. 



■* Handbnch Conch, und Malac, p. 306. 



•"' Struct, and Syst. Conch., vol. iii, p. 187. 



" Man. Conchyl., p. 1070. 



' Journ. of Conch., vol. x, p. 361. 



