24 PALAEONTOLOGY OF ILLINOIS. 



not unlike 0. striatus Ag. (loc. cit. fig. 14-17), but in that species this base is 

 much thicker and broader, and the median cone is not compressed. 



Figure 4, anterior face of mutilated tooth ; 4 a, outline of base from above. 



Formation and locality: St. Louis limestone, Warsaw, Illinois. 



Cladodus magnificus, Tuomey. 



PI. 1, Fig. 6, 6 a. 

 C. magnificus: Tuomey, 2d report on Geology of Alabama. 



It is probable that this is the species to which Prof. Tuomey 

 gave the above name, though not quite certain, as he has left 

 no description, and only an exceedingly rude wood cut to 

 guide us. 



The median cone, in the specimens before us, is very large 

 and robust, nearly as high as the base is broad, somewhat com- 

 pressed above and below, nearly cylindrical in the middle, 

 without lateral angles, unless near the summit. It is strongly 

 and evenly striated longitudinally. The base is very large and 

 thick, truncated before, thinning out behind, rather smooth on 

 both surfaces; lateral cones conical, smooth or finely striated, 

 about 5 on either side, the exterior pair largest. 



Figure 6, represents the anterior aspect, and 6 a, the outline of the base 

 from above, natural size. 



Formation and locality: Sub-carboniferous limestone, Huntsville, Alabama. 



Cladodus angulatus, N. and W. 



PI. 1, Fig. 1, 8, 8 St. 



Teeth of medium size, robust, width slightly less than height; 

 base sub-elliptical, relatively thick; median cone conical, com- 

 pressed, sigmoidally curved, medial portion of both anterior and 

 posterior surfaces flattened, giving the section an angular out- 

 line; both surfaces finely striated longitudinally; lateral den- 

 ticles one and sometimes two on either side, generally merely 

 rudimentary. 



