﻿On Conodonts and Fossil An nelid Jaws. 



147 



strata of the Cincinnati group, in the southwestern part of Ohio, but not, 

 what may be considered, abundantly. The writer has noticed, also, in the 

 same beds the u dark chitinous fragments" that Dr. Hinde refers to as. 

 probably, the skin of the animals. A number of the specimens found in 

 these beds I am able to identify as Dr. Hinde's species, by the aid of his 

 clear descriptions and excellent figures, but others I have not yet suc- 

 ceeded in identifying. Four of these seem so decidedly diiferent that I 

 venture to describe and figure them as new species. 



CONODONTS. 



GENUS PRIONIODUS, Pander, 1856. 

 Prioniodtjs dychei, Sp. nov. 



(Plate VII., figures A & B.) 



The jaw of this species seems to be nearly entire, showing both the 

 right and left sides, and prolonged anteriorally into a curved hook or 

 tooth, standing at nearly a right angle with the jaw plate, and curved 

 slightly inward. (See fig. A.) On the right side, viewed from the 

 posterior end, there are six teeth, three of which are broken away just 

 above the jaw plate, the stumps showing clearly, as seen in the figure (A). 

 The other three project to nearly the height of the anterior curved hook, 

 but are broken at the tops, as is the hook, as shown by the fractured 

 apices. The portions broken away are evidently slight; this side of the 

 jaw is linear ; the teeth have a backward slope. In the other side of the 

 jaw there are stumps ot five teeth. It curves slightly outward from about 

 the middle to the posterior end, and appears to have been broken off, as it 

 is slightly shorter than the right side, and has one less dentation. 



Length of jaw a little over T L of an inch; width, measuring from the 

 crest of the long teeth to the base of the left side, is about § of the length. 



The teeth and upper portion of the anterior hook are of a light horn 

 color, translucent and have a bright shiny luster; the jaw plate a lustrous 

 black. 



The type specimen (fig. A) used for this description was found in the 

 upper part of the Cincinnati group. Warren Co., Ohio, by the Hon. Wm. 

 W. Wilson, of Lebanon, that county. The other specimen (fig. B) was 

 found by the writer near Eden Park reservoir, Cincinnati. The vertical 

 range between the two localities, according to Prof. Orton's tables in Volume 

 I., Ohio Geology, 1873, is over 500 feet 



By special request of Judge Wilson, the writer takes great pleasure in 

 naming the species in honor of our highly esteemed friend Dr. D. T. D. 



