Historical Account of Tcsfaceological Writers. 209 



tomist has distinguished himself by other dissections of Tesfacen, 

 which will be found in the Annales du Museum Natio7ial, and 

 which we have much satisfaction in particularizing. His first 

 memoir in that journal relates to the animal of Lingula anatina of 

 Lamarck {Patella Unguis of Linnaeus), the parts of which are ad- 

 mirably exhibited in the 17th plate. In the subsequent number 

 Bulla aperta {Bullcea of Lamarck) is described and figured with 

 equal ability. It is by such minute and accurate examinations 

 that species are definitively fixed, and we cannot forbear express- 

 ing a hope that M. Cuvier will continue to present us with other 

 examples of the successfulness of his researches among this still 

 imperfectly known order of animals. 



Several minute and other shells not before known are de- 

 scribed in the Trans, of the Linn. Soc. by 



JOHN ADAMS, 



who discovered them on the coast of Pembrokeshire. The de- 

 scriptions, which are perfectly scientific, are accompanied by 

 figures. In mentioning the name of Mr. Adams, the authors of 

 the present paper, who were so fortunate as to enjoy his corre- 

 spondence on Testaceological subjects, cannot omit paying a tri- 

 bute of respect to his memory, from having witnessed the enthusi- 

 asm and perseverance with which he pursued the study of nature ; 

 nor can they help reminding their fellow-members of the loss they 

 sustained in the untimely death of one who gave such unequivo- 

 cal proofs of usefulness and ability. 



It is a task as laborious as it is unlimited to push the examina- 

 tion of natural objects beyond the ordinary powers of the senses; 

 and it may, perhaps, be questioned by some, whether such pur- 

 suits lead to any useful practical purposes : yet the supplying of 



VOL. VII. 2 E liaks 



