Bibliographical Notices, 273 



Symbols ad Historiam Heliceorum ; auctoreL. Pfeiffer. Sect, prima 

 1841, altera 1842, tertia 1846. 



In the two former parts of this work the author has given an ac- 

 count of his views on the systematical distribution of the great fa- 

 mily of Helicea, the synonymy of all the genera and species known 

 to him at that time, and descriptions of 280 species, most of which 

 were new, and the remaining ones incompletely described, or only 

 known by figures and names. The third part contains: 1. An 

 account of the method of distributing the immense number of spe- 

 cies of Helix (including Nanina and Stenopus) by a system merely 

 artificial, but suitable, in the author's opinion, for assigning to every 

 species the place where it may be sought, without comparing the 

 total number of nearly 1100 species. 



2. A systematical enumeration of all known living Helices, in 

 which the author has marked the species (about 630) which he pos- 

 sesses in his collection, those which he has studied in other col- 

 lections, and of which he has made accurate descriptions for his 

 • Monograph,' and those which he knows only from descriptions or 

 figures. Under every species is quoted the work where it is first 

 published, or some good figure. 



3. An alphabetical enumeration of all fossil Helices. 



4. Additions to the synonymy of all the genera of Helicea, con- 

 taining many corrections of names, in accordance with the law of 

 priority. 



5. Descriptions of 145 species {Helix, 77 ; Helicophanta, 1 ; Vi- 

 trina, 3; Tomogeres (Anostoma), 1; Bulimus, 31; Achatinella, 3; 

 Achatina, 13 ; Pupa, 1 ; Clausilia, 15 species). 



6. A continued enumeration of the works which are quoted in the 

 three parts of the ' Symbols?.' 



Philippi's Figures and Descriptions of new or incompletely known 

 Shells. Vol. i. 1842-45 ; vol. ii. No. 9-11, 1845-46. 



This work, which contains contributions by Anton, V. D. Busch, 

 Dunker, Jonas, Koch, Pfeiffer and Troschel, is destined to give, like 

 Guerin's ■ Magazin/ figures of new and interesting shells, with de- 

 scriptions and critical remarks. The figures are drawn on stone and 

 coloured. 



The first volume contains, on 48 plates, figures of 4 species of 

 Area, 5 Artemis, 22 Bulimus, 4 Cyclostoma, 19 Cylindrella, 10 Cy- 

 therea, 12 Fusus, 13 Glandina and Achatina, 6 Haliotis, 50 Helix , 



4 Mactra, 40 Melania, 2 Murex, 12 Natica, 11 Nerita, 15 Neritina, 



15 Paludina, 11 Pecten, 8 Psammobia, 4 Pyrula, 9 Sigaretus, 6 So- 

 len, 2 Steganotoma, 1 Streptaxis, 1 Strombus, 12 Tellina, 43 Trochus 

 (Turbo and Monodonta), 4 Unio, 16 Venus. 



The three parts of the second volume, which are already pub- 

 lished, contain figures of 6 species of Area, 10 Astarte, 7 Bulimus, 



16 Cylindrella, 9 Cyrena, 8 Fissurella, 6 Fusus, 3 Haliotis, 25 Helix, 

 3 Mactra, 13 Natica, 1 Ostrea, 2 Streptaxis, 10 Tellina, 18 Trochus, 



5 Venus. 



