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Cincinnati Society of Natural History. 



Dyche, of Lebanon, who has done so much in collecting and developing 

 many of the finest Crinoids, etc., found in the Cincinnati group, and to 

 whom we feel under great obligations for valuable information and other 

 kind attentions. 



GENUS POLYGNATHUS, Hinde, 1879. 

 Polygnathus wilsoni, Sp. nov. 



(Plate VII., figure C.) 



Jaw plate arched above and a little so at the base, with a slight pro- 

 jection or prominence near the middle; seven strong teeth in the upper 

 arched portion of the jaw, the three central ones being entire, the other 

 four (two on each side of the three) partly broken away, all standing at 

 angles corresponding, mainly, with the curve of the arch. (See figure C.) 

 The teeth are of a light, shiny horn color, translucent; the jaw below the 

 base of the teeth black and glossy; the most prominent of the three 

 perfect teeth, however, is of a dark color part of the way upward from the 

 jaw. Length of jaw of an inch, height from base to top of longest 

 tooth § of length. 



Another example has the lateral teeth, seemingly perfect, but owing to 

 the rock, in which it is partly embedded, being of a similar light shade, it 

 is different to determine this point positively; in other features and size it 

 is nearly identical with the first. 



The specific name is given in honor of Hon. Wm. W. Wilson, of 

 Lebanon. Warren Co., 0., who found the three specimens used for this 

 description in the upper part of the Cincinnati group, at the same locality 

 as the preceding described species. 



ANNELIDA POL YCHJETA. 

 GENUS AEABELLITES, Hinde, 1879. 

 Arabellites actculattjs, Sp. nov. 



(Plate VII., figure E.) 



The jaw plate has a comparatively long hook anteriorly, curving quite 

 sharply inward. A regular curve from the point of the hook to the upper 

 margin of the jaw and to the first dentation, forming almost a semi-circle, 

 where the outline arches gently back to the posterior extremity. Seven 

 short teeth, of irregular lengths, having a marked backward slope occupy 

 this upper arched portion of the jaw. The curved outline from the top 

 of the hook in front downward extends to a pointed shank below, about 

 one- third the distance backward, where the lower margin curves upward, 

 then backward to the posterior extremity. Quite a sharply defined ridge 



