157 



In order to give some idea of the prices paid for the rarer 

 species of Cyprsea, it is reliably stated that the second specimen 

 of C. umbilicata sent home by the collector, Mr. Roland Gunii, 

 of New South Wales, was sold for 30. Good specimens can now 

 be had for about $2.50 each. 



A specimen of C. guttata, of which the Philadelphia Academy 

 of Natural Sciences possesses a fine example, was sold at auction 

 a few years ago, and cost the purchaser 42. This species is 

 still extremely rare. Other species range in price from $2.50 to 

 $25.00 each : notwithstanding this, a good collection of the species 

 can be obtained at a cost not exceeding $25.00. 



A number of monographs and catalogues of the Cypraeidie have 

 been published, the most important being the following : 



Gray. J. E. Zoological Journal, 1824 to 1829. A monograph, 

 including 113 species, some of which are figured. 



Descriptive Catalogue of Shells, 1832, in which are enumer- 

 ated and described 121 species. 



Sowerby, G. B. Conchological Illustrations, 1837. Colored 

 figures of 143 species, a number of which are described. 



Kiener, L. C. Coquilles vivantes (no date). A monograph in- 

 cluding 145 species with colored figures. 



Reeve, Lovell. Conchologia Iconica, 1845. Monograph with 

 colored figures of 154 species. 



Roberts, S. R. Catalogue and Synonymy of Porcellanidae. Amer. 

 Jour. Conchology, v, 1869. 



The species, 197 in all, are alphabetically arranged with the 

 synonymy and bibliography fully indicated. The names pro- 

 posed by authors prior to Linnaeus, when binomial, are here 

 recognized. 



Sowerby, G. B., Jr. Thesaurus Conchyliorum, 1870. Mono- 

 graph, including 189 species, with colored figures. 



Weinkauffj H. C. In the Systematisches Conchilien-Cabinet of 

 Kiister, 1881, 185 species are described and figured, the notes 

 added to some of the descriptions being often quite compre- 

 hensive. This author also enumerates the species, with par- 



