BIBLIOGRAPHY. 3 1 



The eighth part treats of Neritidae and Turbinidae. The 

 family Neritacea contains only a single genus and species, 

 Smaragdia viridis, of which four varieties are described and 

 figured, two of them for the first time. The Turbinidse 

 embraces the genus Turbo, containing the sub-genera Bolmaand 

 Collonia, each with a single species. The genus Phasianella 

 has the sub-genus Tricolia with three species and many 

 varieties. The Trochidse is arranged under three genera, and 

 seven sub-genera, and is very elaborately worked out, the 

 variation being carefully noted, and each form illustrated by a 

 good figure. This work is a most excellent one, and in a very 

 many respects is a model of what such a work should be. — 

 J.W.T. 



Manual of Conchology — Structural and System- 

 atic, with illustrations of the species, by Geo. W. Tryon, Jr., 

 Conservator of the Conchological Section of the Academy of 

 Natural Sciences of Philadelphia. 



Part xix. of this exhaustive work is a continuation of the 

 Columbellidse, and deals with the Sections Mitrella, Atilia, 

 Anachis, Seminella, Mitropsis, Conidea, Meta, and Strombina, 

 almost every species being figured, and in some cases the animal 

 and operculum. 



Part XX. The genus Engina commenced in last part is 

 continued in this, and the genus Columbellina is also worked 

 out. Seventy-eight pages of this part consists of an useful index 

 to the generic and specific names used in the volume, which in 

 all embraces sixty-three plates full of figures. 



The sixth volume of this great work is devoted to the 

 Conidse and Pleurotomidse, and contains 413 pages and sixty-five 

 plates, the execution of which is admirable and much superior 

 to those of previous volumes. In the classification of the Cones, 

 Dr. Weinkaufif's arrangement is adopted of seventeen sections 

 named after the typical species in each group, viz.: — Marmorei, 

 of which C. niarmoreus L., is the type ; 2, Literati, of which 



