Reviews — Barrande^s Cephalopoda. 33 



principal masses of rock, which, form the surface of different dis- 

 tricts ; and also the geological map of Aloys Mayer, 1837. 



In the second edition of "Siluria" will be found a clear account 

 of the Palceozoic rocks of Bohemia and their British representatives, 

 from a personal traverse of the different districts by Sir E. I. 

 Murchison. 



By the labours of M. Barrande, the numbers were soon increased to 

 more than 1200 species, most of which were new to science, and which, 

 in 1856, amounted to nearly 1500 species.^ The first-fruits of these ac- 

 quired treasures were given about thirteen years since, in a costly work, 

 the first of a series,'^ containing a description of the Trilobites, form- 

 ing a standard memoir on the subject, and consisting of two quarto 

 volumes of nearly a thousand pages of text, and atlas of fifty plates, 

 the latter carefully engraved by M. Fetters^ under the immediate super- 

 intendence of M. Barrande. Prior to this work, the same author had 

 published a volume (1847) on the Silurian Brachiopods,^ comprising 

 eight genera and 175 species, which group will be hereafter com- 

 pleted ; as also a special memoir on the Graptolites (1850), a group 

 which appear to have had a limited existence in Bohemia, com- 

 mencing in the upper part of the Lower Silurian (Stage D), and 

 disappearing before the end of the Upper Silurian (Stage E). 



Although, since this period, M. Barrande has published many 

 papers, either separate or in the scientific journals, among which 

 may be noted the Defence of the " Colonies," his chief attention has 

 been directed to the continuation of his great work, of which the 

 title of the volume given above is a proof. It is a commencement 

 of the Fossil MoUusca, comprising the first series of the Cephalopoda, 

 and consisting of 107 plates of figures of about 200 species, repre- 

 senting the following genera — Goniatites,de Haan; Noihoceras, Barr. ; 

 TrocJioceras, Barr. ; Nautilus, Linn. ; Gyroceras, Kon. ; Hercoceras, 

 Barr. ; Lituites, Breyn ; PJiragmoceras, Brod. ; GompJioceras, Sow. ; 

 Ascoceras, Barr. The two other genera, Orihoceras and Cyrtoceras, 

 which complete the family of Silurian Nautilidce of Bohemia, being 

 relatively much more rich in species than the preceding, will occupy 

 the second and third series, the total amounting to no less than 350 

 plates for the Cephalopods alone. The text descriptive of the above 

 ten genera will be shortly published ; but the principal characters 

 of the species are indicated in the description of the plates. 



The genus Ascoceras is fully illustrated ; this interesting form has 

 also been identified by Mr. Salter, as occurring in the Upper Silurian 

 of Britain, at Usk, Ludlow, and Malvern, and named by him A. Bar- 

 randii, in complement to the author of the above work. * 



^ Parallele entre les Depots Siluriens de Boheme et de Scandinavie, 



2 Systeme Siliirien, Premiere partie, Recherches Paleontologiques, Trilobites, 1852. 



3 Tiber die Brachiopoden der Silurischen Schichten von Bohmen, Naturwissen- 

 scbaftlicbe Abbandlungen, etc. Herausgegeben voa Haidinger, Wien. Band I. and 

 II. 1847-48. 



* Salter, Quart. Geol. Journ. 1856, vol. xii. p. 381. Siluria, 2nd Ed. p. 259. 

 Ascoceras and its affinities had been previously described by M. Barrande, in the Bull, 

 de la Soc. Geol. de France, 1855. 2 Ser. t. xii. p. 157. 



VOL. HI. — NO. XIX. 3 



