task; and llioj' will ho found to assist mateiially in the 

 advancementof concliuioo^ical knoAvlodgo. The three remain 

 ing Genera, of which illustrations, but not catalogues, have 

 been given, are accompanied by indices referring to descrip- 

 tions and stating localities in every practicable instance. 



A short interval will probably elapse before the commence* 

 tneut of a new series, and it is at present a subject of consi- 

 deration whether the Illustrations will be continued in the same 

 form. It has been suggested that monographs of Genera, 

 with the figures on a reduced scale, could be published at a 

 much smaller expense, in proportion to the number of species, 

 and would be more generally useful than the present plan. 

 In compliance with these siiggestions, the proprietor is en- 

 gaged in preparing monographs of several Genera, which 

 will make their appearance at about the fall of the year, 

 and the calculations made give reason to hope that the 

 figures and descriptions may be produced at the rate of about 

 one penny for each species. 



From the fact that the figures contained in the present 

 work, are constantly quoted by the English and Continental 

 conchologists, who have written during the course of its 

 publication, there can be no doubt of the desirableness of 

 continuing to publish figures of species, accompanied by 

 information respecting localities, characters, and nomencla- 

 ture, and the artist would feel a pleasure in doing so, even 

 had he no reason to hope for a greater amount of usefulness 

 or of success than at present enjoyed ; but the question is, 

 whether, by altering the plan, and reducing the scale of 

 the figures, he might not command a greater degree of success, 

 and contribute to the advancement of conchological know- 

 ledge, to a wider extent. The experiment is about to be 

 made, and in taking leave of the subscribers for a time, the 

 gratifying hope is entertained, that the future re-appear- 

 ance of the artist, will take place under the influence of their 

 continued encouragement, strengthened by that of many 

 other friends to the science. 



