BUITALO SOCIETY OF NATURAL SCIENCES 139 



but no tertiary rays are to be seen. The fin is rather 

 pointed, and the web is prolonged posteriorly beyond the 

 last ray into a fin-fold, about half as long as the base 

 proper, of the fin. 



Family CLADODONTID^ 



Cladodus coniger Hay 



E 2078-9 We refer to this species the impressions of two imperfect 

 teeth from the Catskill beds in Crawford County, Penn- 

 sylvania. Each tooth consists of a central cone and two 

 denticles on either side of it, directed laterally. The 

 crowns are marked by striations or carina. This species 

 has hitherto been known only from the Chemung. 



Top layer of the Second Mountain Sandstone (Cats- 

 kill); Snodgrass Quarry, Crawford County, Pennsyl- 

 vania. Collected by J. F. Carll. 



Cladodus urbs-ludovici Eastman 



(PI. 44, figs. I, I a) 

 Cladodus urbs-ludovici Eastman, Devon. Fishes Iowa, no, pi. iii, fig. 3. 1908. 



Three cladodont teeth from the Conodont bed represent this species, 

 which was hitherto known only by the holotype. an imperfect tooth, 

 from the New Albany shale (Genesee) of Kentucky. It is interesting 

 as adding another to the three or four species common to the New 

 Albany shale and the Conodont bed. 



Since the original description of the species was based on a single 

 imperfect tooth, which did not show the root well, and also lacked the 

 distal half of the crown, it seems desirable to give a revised description 

 of the species, based on our three specimens. 



Description. — Tooth a large, somewhat compressed cone, rising 

 from a laterally expanded base. No lateral denticles. Crown 

 elliptical in cross-section, with sharp lateral keels; the posterior face 

 somewhat more convex than the anterior. Both faces ornamented 

 with very fine, parallel, vertical lines which end abruptly at the merg- 

 ing of the crown and base. Apex of crown reflexed slightly forward. 

 Base rather compressed antero-posteriorly, laterally expanded, with 



