113 Observations on the Storm of Dec. 15, 1839. 



cellated, with longitudinal sulcations, and transverse strias ; spire 

 acute ; whorls eight, convex ; sutures somewhat deep ; base 

 brown ; mouth elliptic, angular above, sub-canaliculate below ; 

 columella brown ; outer lip acute ; operculum black. 



Length 15. Breadth "05 of an inch. 



Hab. Delaware Bay. Cabinet of I. Lea. 



Remarks. — The transverse striae are usually almost obsolete on 

 the upper whorls, while the longitudinal sulcations become en- 

 tirely so on about the last whorl and a half. The strias are con- 

 tinued to the very base, which together with the columella are 

 brown. The color of the last whorl and a half is generally 

 yellowish, while the rest of the shell is dark brown. The lower 

 whorls are frequently much more convex than the upper. The 

 mouth is -05 of an inch in length, and -035 wide. I at first mis- 

 took this shell for a Turritella, from the fact of the canal not 

 being added until the shell has attained its full growth. This 

 species might be regarded as consisting of dwarf specimens of the 

 Cerithiiim Sayii, Menke, but it is not more than half the size of 

 that shell, its whorls are more convex, its cancellations more ob- 

 solete, and the shape of the canal is totally different, being much 

 longer and less oblique. It resembles it however in its mode of 

 growth, the lower whorls being entirely different from the upper. 



Philadelphia, May 17th, 1841. 



Art. XII. — Observations on the Storm of December 15, 1839 ; 

 by William C. Redfield, A. M.* 



Read before the American Philosophical Societ}^, Jan. 15, 1841. 



In the table and map which are annexed to these remarks will 

 be found the observations which have been obtained of the di- 

 rection of wind in this storm, in the states of Connecticut, Rhode 

 Island, Massachusetts, New Jersey, and parts of the states of 

 Maine, New Hampshire, Yermont, and New York. 



The arrows on the map denote, approximately, the direction of 

 wind, at or near the hour of noon, at the several places of observa- 

 tion. The concentric lines, drawn at intervals of thirty miles, were 

 added, not as precisely indicating the true course of the wind, but 

 to afford better means of comparison for the several observations. 



It will be seen, that of forty-eight distinct sets of observations, 

 which are comprised in the annexed schedule, about thirty are 



* From the Transactions of the American Philosophical Society. 



