96 MISCELLANEA. 



Orthoceratite, showing that the shell terminated in a point; and if 

 we calculate the rate of diminution from the part preserved, we may 

 suppose that the whole shell could not have been less than four feet 

 long, — dimensions equal to those of the specimen seen by M. von 

 Buch at Romberg. 



The shell itself being exceedingly thin, and yet of so great a 

 length, it must have been internal, since it is not possible to imagine 

 how it could in any other way have been preserved uninjured : sur- 

 rounding the shell, and in the direction of its length, indications of 

 the enveloping substances may be traced. 



This shell, not having been cut along the middle, must have 

 been somewhat larger than the size recorded, and the last chamber 

 was probably at least an inch in diameter. 



These shells seem to have many points in common with BaculiteSy 

 from which they differ in the complex intersection of the septa with 

 the shell in the latter, while in the Orthoceratite this intersection is 

 simple. 



It is thought by MM. de Verneuil and Murchison, who have seen 

 this specimen, that the whole length of the shell would exceed six 

 feet. It is probable that the fossil in question is from Oeland. 



