32 



THE GEOLOGIST. 



Families. 



I. Bipartites. 



II. Notosipliites. 



Groups. 



Species. 



I Polygonates. 



r II. Plates 



III. lotriphites. 



I. Coniques. 



II. Cylindriques 



Belemnites bipartitus. (Des- 

 hayes.) 

 ' B. isoscelis. (Duval.) 

 B. urnula. (Duval.) 

 B. trabiformis. (Duval.) 

 B. sicyoides. (Duval.) 

 r B. hybridus. (Duval.) 

 < B. dilatatus. (Blainville.) 

 I B. Emerici. (Raspail.) 

 III. Semi-plates. J B. latus (Blainville.) 



B. gi'asianus. (Duval.) 

 B. extinctorius. (Raspail.) 

 B. Orbigiiyanus. (Duval.) 

 B. subfusiformis. (Raspail.) 

 B. pistilliformis. (Blain^alle.) 

 B. platyurus. (Duval.) 

 B. semicanaliculatus. (Blain- 

 ville.) 



A geological description of the district is added to the 

 work, accompanied by plan and sections, so that it not 

 only forms an excellent description of the Belemnites gene- 

 rally, but combines the useful appendages of a notice of the 

 geology and the Belemnites of the district. 



In closing our short notice of this work, we would direct 

 attention to the plates, both as accurate delineations of the 

 species and specimens of lithography, as also on account of 

 the great variety of forms represented. 



