The families, genera, and sub-genera will be printed in large, 

 heavy-faced type, with references to authorities and dates in 

 smaller type ; the synonyms in italics. 



The specific names (in heavy-faced type) will be arranged 

 alphabetically, preceded by numbers, and followed by authori- 

 ties and references to the original descriptions. It is intended 

 to include among the references to each species, the monographs 

 in which it is figured. 



The principa,l synonyms will be printed in italics, with full 

 bibliography. Finally, the localities will be given. 



The following example will give a better idea of the plan of 

 the work than can be conveyed, by description. 



Genus BRECHITES, Guettard, 



Mem. de I'Academie, Paris, ii. 18, 177-i. 



Aspergilhan, Bruguiere, Encyc. Meth. Vers. 1789. 



Sub-genus WARNEA, Gray. 

 London Zool. Proc. 309, 1858. 



4. B. Australis, Chenu, Illust. Conchyl. 3, t. 3, f. 1. 



AspergiHum Cumingianvm, Chenu, Illust. Conchyl. 3, t. 3, f. 1. 



Reeve, Conch. Icon., Monog. AspergiHum, t. 2, f. 7, 1860. 

 AspergiHum inccrtum^ Chenu, 1. c. 4, t. 4, f. 4, 5. Reeve, 1. c. 



i. 4, f 19, 1860. 



After printing the Catalogue, the types composing the cur- 

 rent number, name and authority, will be taken out and in- 

 serted within stereotyped borders, for the purpose of printing, 

 on fine heavy card-board, labels for collections, thus : — 



Genus BRECHITES, Guettard. 



AspergiHum, Bruguiere. 



Brechites Australis, Chenu. 



( Varietij or Remarks.) 

 {Collector.) 4 {Locality.) 



