TRANSLATIONS AND NOTICES 



OP 



GEOLOGICAL MEMOIKS. 



The SiLrRiAN CErsALOPODA 0/ Bohemia. By M. J. Baerande, 



[Systeme Silurien du centre de la Boheme. Par Joachim Barrande. Ire Partie : 

 Recberches Paleontologiques, vol. ii. Classe des Mollusques. Ordre des 

 Cephalopodes. Texte : 4to, 1867, pp. 712. Planches: l^^^ serie, nos. 1 a 

 107, 1865 ; 2^ serie, no3. 108 a 244, 1866.] 



This Monograph of the Silurian Cephalopoda of Bohemia is divided 

 by M. Barrande into two parts, of which the first only has been 

 pubHshed. This consists of a description of 16 genera or prin- 

 cipal subgenera, which are represented in the Bohemian basin by 

 447 forms. These are classified by the author according to the 

 following Table, those which are marked with an asterisk not being 

 found in Bohemia : — 



Fam. GoFiATiD^. 

 Goniatites, De Haan. | Bactrites, Sandberger. 



Fam. Xautilid^. 



First Series. 

 Simple Aperture. 



Second Series. 

 Compound Aperture. 



Trochoceras, Barr. &, Hall. 

 Nautilus, Breyn. 

 Gyroceras, Kon. 



* Lituunculus, Barr. 



* Subg. Discorera.% Barr. 

 C>/rfoceras, Goldf. 

 (^Orthoceras, Breyn.) 

 Ascoceras, Barr. 

 Aphragmites, Barr. 



Hercoceras, Barr. 



Lituites, Brejn. 

 Subg. Ophidioceras, Barr. 

 Phragraoceras, Brod. 

 Goraphoceras, Sow. 

 Glossoceras, Barr. 



Heterogexeous Forms. 

 Simple Aperture. 



NotJioceras, Barr. 



Bathmocera*, Barr. 



In the second part will be described the forms which belong to the 

 genus Ortlioceras, and the other straight shells which may be asso- 

 ciated with that type either as subgenera or as constituting indepen- 

 dent genera, namely: — Gonioceras, HaU ; Kndoceras, Hall ; and Treto- 

 ceras, Salter. M. Barrande first defines the limits by which he has cir- 

 cumscribed the generic types, and applied specific names to the forms : 

 he then remarks upon their vortical :uid horizontal distribution in 



VOL. XXIII. PART II. D 



