Historical Account of Testaceological Writers. 185 



concerning their natural history. A Linnean table is subjoined 

 hy the editors; this is too inaccurate, however, to be of use to a 

 scientific student. 



But the aboA e was not the only Testaceolog-ical work, materials 

 for which were compiled by this industrious and able artist. His 

 " DelicicB NaturcB selectee" contain seven finely coloured plates of 

 shells, Avith copious descriptions in French and German, intended 

 for popular use. This volume came forth under the direction of 

 Muller and de la Blaqui^re, the original author having died prior 

 to the time of its publication; but his name cannot fail to be re- 

 membered with respect by those Avho devote themselves to his 

 favourite pursuit, from the reflection that the useful parts of these 

 elegant performances originated entirely with himself. 



In this place it will be proper to notice a compendious view of 

 various systems of Testaceology Avritten by 



DE BERGEN, 



and printed at Nuremberg in I76O. It exhibits the systems of 

 twenty-four different authors, under the heads of " Methodi uni- 

 versales" and " Methodi particulares," Avith concise strictures on 

 each s3-stem separately. This Avork originally appeared in the 

 Nov. Act. Ac. Nat. Cur. 



The Acta Helvetica contain tAvo Testaceological papers from 

 the pen of 



SCHLOTTERBECCIUS; 



one entitled " Observation's de Cochlea quadam ad Turbines refe- 

 renda," and the oth-er " Observatio Physica de Cochleis quibusdam 

 7iec nan de Turbinibus nonnuUis," &c. The Acry titles indicate the 

 desultoriness of these descriptions; and the figures accompanying 

 them do not supply their imperfections, except indeed some 

 which are illustrative of the ])aper last mentioned, and which re- 

 voL. VI r. 'in late 



