﻿Description of a New Species of Gomphoceras. 



255 



latter, a semi-elliptical stone, exactly nine inches long on the straight edge, 

 and exactly twelve inches on the curve, as the measuring stone of the 

 ancient Mound Builders. He referred to the detailed measures of the 

 mounds made by Squier and Davis, and showed how the works could be 

 separated into three groups, in which the circle 1050 feet in diameter, and 

 a square 1080 feet to the side, were connected in a peculiar manner. 

 He quoted the opinion of Squier and Davis that the Mound Builders 

 possessed some standard of measure, and gave as his opinion that the 

 semi-elliptical stone was the measure in question. The paper will be 

 published in a future number of this Journal. 



The following papers were read and referred to the Publishing Com- 

 mittee : 



DESCRIPTION OF A NEW SPECIES OF GOMPHOCERAS, 

 FROM THE TRENTON OF WISCONSIN. 



Bv Prof. Joseph F. James, 



Custodian Cincinnati Society of Natural History. 



GOMPHOCERAS POWERSI, n. sp. Plate IV, fig. 2. 



Shell medium size, oblong-oval ; ventral side nearly straight, dorsal 

 curved ; body chamber contracting slightly near the aperture, and then 

 expanding into a sort of lip, and occupying at least one-half the length of 

 the shell : septa narrow, four or five in number : below the septa the shell 

 contracts and tapers to where broken with no indication of septa : aperture 

 broad oval on the ventral and contracting rapidly and rounding in on the 

 dorsal side : siphuncie unknown. Length on straight side two inches ; 

 on curved two and one-half inches. 



Locality and Formation : Beloit, Wisconsin. Trenton. Collection 

 of C. L. Faber, Jr. The species is named in honor of Mr. H. C. Powers, 

 of Beloit, Wisconsin. 



THE MY CO LOGIC FLORA 



POLVPOREI. 



Bv A. P. 



OF THE MIAMI VALLEY. 



(Concluded. ) 



Morgan. 



[This paper will be printed in the next number of the Journal.] 



