﻿140 



Cincinnati Society of Natural History. 



Stromatopora Ludlowensis, Sp. nor. 



(Plate VII., figures 4 and 4<z. 



This fossil is composed of irregular, undulating, concentric laminae of 

 variable thickness, from four to six in the space of one-tenth of an inch, 

 including interspaces. Is of various amorphous outlines and sizes ; some- 

 times built upon and around other substances. One specimen is 4|x3 

 inches in the longest and widest direction, and about two and one-half 

 inches thick; grown upon Monticulipora mammulata (?), covering the 

 coral nearly entire to the variable thickness of from one-tenth to over three- 

 tenths of an inch. The specimen figured is not built upon any foreign 

 substance, but is made up altogether of the concentric laminae. 



A polished transverse section (see figure 4a) shows the superimposed 

 laminae and a number of circular and oval pits, seemingly transversely cut- 

 off oscula, irregularly distributed through the fossil; and a convex portion 

 of the same specimen cut obliquely, at a low angle, through the laminae, 

 shows several of the canals traversing the mass in different directions. The 

 surface of all specimens examined is irregular and rough, showing numer- 

 ous minute pores and more or less of the larger — oscula — openings. 



The type (figure 4) specimen and others used for this description, were 

 found by the writer near Ludlow, Kentucky, opposite the lower part of 

 Cincinnati, about fifty or sixty feet above low-water mark of the Ohio 

 River. Cincinnati group. Others fouud on the hills of Cincinnati and 

 elsewhere at higher horizons. 



BLACK AND OSWEGO BASS. 

 By Chas. Dury. 



Read and referred, August 5, 1884. 



Dr. Henshall says in Appendix No. 1 , of the eighth Annual Report of 

 the Ohio Fish Commission: "Possibly no genus of fishes has been the oc- 

 casion of so much confusion, scientifically and popularly speaking, as the 

 Black Bass." Although Dr. Henshall is the highest authority on this 

 subject, and gives very exactly the differences between the true " Black 

 Bass," Micropterus dolomieu, and the "Oswego Bass, ' Micropterus nigri- 

 cans, and although the extreme of dolomieu and the extreme of nigricans 

 are very different, yet the intermediate forms are impossible to locate. 



The differences given by Dr. H. are that the "Oswego Bass" has a 

 much larger mouth than the true Black Bass. Hence he calls it the 

 < Large Mouthed Bass," and the other the "Small Mouthed Bass." The 



