BIROSTRITES 



probably belongs to his Brachiopodes ; Discina should be 

 expunged^ as being identical with Orhicula and Crmiia as 

 we have shown^ (Linn. Trans, xiii.) is decidedly a Bra- 

 chiopode. 



The principal difference between Birostrite and Diceras 

 appears to consist in the straightness of the horn-shaped 

 valves of the former^ while those of the latter are spirally 

 curved. We have given two views of the Birostrites 

 inaequilobus^ a fossil whose locality we do not know, 

 nor are we acquainted with the stratum in which it 

 is found. We shall be happy if we should, by publish- 

 ing this Genus, excite such enquiry as may lead to the 

 discovery of its locality, and any other interesting facts 

 connected with it* 



