409 



unicum sinistrorsnm volventes monstrante ; crista elevata, lunata, 

 spiram baud attijiente. Apertura angusta, ovata. Long. 10; 

 diaiii. maj. 5 ; diam. min. o millim. Taken at sea south of the 

 Caroline Is. W. 8. 



The unusual length of the shell, the very elevated crest, equal- 

 linir half the major diameter, and the waved, almost plicate surface 

 make this a strongly marked species. 



Prof. Rogers presented some fine impressions of fossil 

 shells from an island in Saco River, obtained from a 

 boulder two hundred feet above the level of the sea. 



This boulder, if boulder it be, is very large, buried at the base, 

 and crowded with Devonian fossils. The rock is like that at 

 Dennis River, and perhaps there may be an outlying patch at the 

 mouth of Saco River. 



Dr. Jackson confirmed the opinion of Prof. Rogers that it is a 

 boulder ; he was well acquainted with this region, where a band 

 of this rock crops out on the Aroostook River, to north of Moose- 

 head Lake, from which boulders are scattered even to the outer 

 islands of Penobscot Bay. He observed that this is an ex- 

 ceedingly interesting region to the geologist on account of the 

 extent and perfection of the drift phenomena. 



Mr. Marcou exhibited a young growing cactus, the 

 Cereus ^isroMteus. from the river Gila. 



a "o 



Prof. Rogers presented the following account of observa- 

 tions on the coiling of the tendrils of the winter squash. 



These statements are selected from a number of observations 

 intended to mark the rapidity, force, and other particulars of the 

 coilincr movement. Thev were made during the last ten days of 

 August, 1859, the appearances being noted at 3 p.m. of each suc- 

 cessive day while the observation lasted. 



1. Aug. 20, 3 p. M. A smooth, round stake, one fifth of an 

 inch in diameter, was planted in contact with the inner side of a 

 tendril, about an inch from its shghtly incurved extremity. A 

 similar stake was placed behind, and touching the thick, trailing 

 stem from which the tendril issued, for the purpose of marking 



