84 PROCEEDINGS OF THE ACADEMY OP 



really the fruits of the fresh-water genus Cliara. At any rate, they certainly 

 seem to present all the external characters of the same. These little bodies 

 are globose, about 0.05 of an inch in diameter, and each ornamented by nine 

 strongly defined, and very regularly disposed, spiral ridges, which start on 

 one side around a minute i)it, and pass with perfect regularity spirally so as 

 to converge to an exactly ojiposite point on the other side, making each about 

 one spiral turn in passing from side to side. If really the seeds of this fresh- 

 water genus of plants, they must have been carried into the sea by streams, 

 and deposited where we now find them, along with numerous marine shells. 



PTEROPODA. 



CONULAKIA MICRONEMA, Meek. 



Shell elongate-pyramidal, with the sides equal and diverging 

 from the apex at an angle of about 16 degrees ; lateral surfaces 

 nearly flat, and without any mesial furrow, but sometimes showing 

 a very faint, slender mesial ridge, that becomes nearlj' or quite 

 obsolete toward the smaller end ; each of the four angles a little 

 rounded, and provided with a shallow, moderately distinct longi- 

 tudinal furrow. Surface with numerous, extremely small, closely 

 crowded, transverse strife, of \nery nearlj^ the same size on all parts 

 of the shell ; striae gently arching forward as they cross the sides, 

 and scarce!}'- interrupted at the little mesial longitudinal ridge ; 

 minutely crenate, and separated by extremely slender linear fur- 

 rows, numbering fifteen in the space of one-tenth of an inch on 

 all i)arts of tlie surface; crenulations of striae twelve to fifteen in 

 one-tenth inch. 



Length of a specimen broken at both ends, with a diameter of 

 0.96 inch at the larger end, and 0.46 inch at the smaller, 2.30 

 inches. 



This species is remarkable for the extreme fineness and closely 

 crowded uniform character of the transverse striai on all parts of 

 the surface. I know of no other species, resembling it in other re- 

 spects, with near such fine crowded striie. At a little distance these 

 lines are entirely invisible to the unassisted eye, and it requires 

 the aid of a magnifier to see them distinctly. The furrows between 

 these striffi are more impressed hair-lines, in which no crenula- 

 tions are visible in the specimen. 



Locality and poHifion. Sciotoville, Ohio. Waverley, or lowest 

 division of the Carboniferous. 



[June 6, 



