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Cincinnati Society of Natural History. 



thinner air chambers, sub-elliptical instead of ovoid section, greater 

 convexity of the dorsal side and other peculiarities indicated in the 

 definition. 



The specimen illustrated is from my own collection, and was found 

 in the middle part of the Hudson River Group, near the tops of the 

 hills, at Cincinnati. Mr. C. L. Faber has a specimen from the same 

 locality with ten air chambers, and agreeing in size and measurements 

 with this specimen. Other collectors have fragments of the same 

 species from the same horizon. 



DESCRIPTION OF THREE SPECIES OF FOSSILS. 

 By U. P. James. 

 Genus Stromatopora, De Blainville. 

 Stromatopora subcylindrica, sp. nov. James. 

 The form of this species is a subcylindrical tube, somewhat com- 

 pressed, filled centrally, in this case, with clay. Prominent, conical 

 elevations, varying in height from l-10th to l-20th of an inch or more, 

 distributed irregularly over the surface. Radiating lines, more or less 

 conspicuous, occupy the apices and slopes of the prominences, giving 



Fig. 1, the type specimen of Stromatopora subcylindrica, James, natural size, showing 

 general surface features; la, transverse section showing the central part filled with clav, 

 natural size; lb, apex of one of the tubercles viewed from above, enlarged, showing the 

 raised lines; lc, lateral view of 16 more enlarged, showing a part of the radiating lines 

 the apex and slopes, and some of the papilla. 



