In drawing out ' Lessons on Shells,' the fol- 

 lowing works have been consulted, and extracts 

 made from them. 



Burrows' Elements of Conchology.. 



Turton's Conchological Dictionary. 



Turton's Bivalve Shells of the British Isles. 



Mawe's Conchology. 



Montagu's Testacea Britannica. 



Flemming's Philosophy of Zoology. 



Lamark's Historic Naturelle des animaux sans 



Vertebres. 



The Conchologist's Companion. 

 Shaw's Nature displayed. 

 Sowerby's Genera of Recent and Fossil Shells. 

 Dillwyn's Descriptive Catalogue of Recent Shells, 



The plates which illustrate this work, have 

 been drawn from specimens actually presented 

 to the class ; they are intended as an assistant to 

 the teacher, but not as a substitute for the shells 

 themselves in the instruction of pupils. 



