64 BIBLIOGRAPHY. 



new varieties of Nassa incrassata are described and figured 

 (vars. minor, elongata and varicosd). Nassa pygmma has two 

 new varieties — elongata and evaricosa. Of Nassa reticulata 

 three new varieties are established — curta, rosea and depicta. 



The whole of the species treated of are examined in a 

 philosophical way in regard to their variations, which are 

 arranged with reference to their form, color or substance. We 

 must continue to express our appreciation of the exellence of 

 this work, and the satisfactory character of the plates with which 

 it is embellished. 



The third fascicule of this beautiful work is to hand and treats 

 upon the Pleurotominse, and contains the genera Pleiirotoma, 

 Clathurella^ Raphitoma and the two new genera, Hcedropleura 

 Monterosato MSS., and Donovania B., D. and D. The genus 

 Pleiirotoma is divided into the subgenera Teres B., D. and D., 

 and Bellardia, B., D. and D. ; Pleurotoma anceps being the type 

 of the former, and Pleurotoma gracile of the latter. A new 

 subgenus oiMangilia is also proposed — Mangiliella B., D. and D. 

 — of which Mangilia niultilineata Deshayes is the type. The 

 genus Hcedropleura is typified in H. septangularis Mtg., and 

 Donovania by D. minima Mtg. A new species of Mangilia, 

 M. Campanoyi B., D. and D., is described and figured. It has 

 affinities with M. albida Desh.,but is distinguished by its color- 

 tion,more ventricose form and its much finer transverse sculpture. 



The work is done throughout thoroughly and exhaustively, 

 Nassa costata, for example, having twelve varieties beautifully 

 figured, the form of each shell being shown to perfection. The 

 five plates included in this part contain no less than 173 figures 

 illustrating 36 species and their varieties. 



The fourth fascicule, which will shortly appear, will treat 

 upon Natica, Lamellaria, Odostomia, Pyrgulina, Turbonilla, 

 Eulimella and Eulima. 



J.C, iv;, April, 1883 



