96 [October, 1844. 



Meeting for Business, October 29, 1844. 



Vice President Morton in the Chair. 



The Committee to whom was referred a paper by Dr. Ra- 

 venel, read May 7th, 1S44, reported in favor of publica- 

 tion. 



Description of some new species of Fossil Organic Remains, from 

 the Eocene of South Carolina. By Edmund Ravenel, M. D., 

 of Charleston, S. C.* 



Genus PECTEN. 



1. Pecten Mortoni. Specific character — Orbicular, thin, both 

 valves moderately convex, one more so than the other — outside, 

 with numerous concentric obsolete strice; inside, — with from eighteen 

 to twenty four radiating double ribs, slightly elevated ; ears large, 

 sub-equal, striated externally. 



This species is nearly allied to the P. pleuronectus and P. japo- 

 nicus. It is found in the limestone on my plantation, The Grove, 

 in St. Thomas's Parish, about 17 miles from Charleston, and also on 

 Goose creek, at Mr. Henry Smith's, about 7 miles South West from 

 the Grove deposit, and 1 1 miles from Charleston; Cooper River being 

 between these localities. 



This shell is abundant at the Grove, but being large and thin, it 

 is generally broken in getting out the marl, and with the exception 

 of a few small specimens, I have not been able to procure a perfect 

 valve. 



The largest specimen in my possession although not perfect, is 

 sufficiently so to determine its size; it is 8| inches in diameter. 



I take much pleasure in designating this shell by the name of our 

 distinguished Geologist, Dr. Samuel George Morton, of Philadelphia. 



2. Pecten Holbrookii. Specific character — Orbicular, convex 

 with twenty-three large, prominent, somewhat flattened ribs, smooth, 

 margin strongly dentate ; ears large, nearly equal, obscurely rib- 

 bed, within deeply channeled on the hinge margin ; cavity of the 

 ligament triangular, deep. Transveise diameter 5s inches, longi- 

 tudinal diameter 4f inches. 



Detached valves only have fallen into my hands. It occurs in my 



* It is designed to give wood-cuts of these interesting species in a fu- 

 ture number. 



