416 Davis — On the Fossil Fish of the Cretaceous Formations of Scandinavia. 



extremity. Teeth of the upper jaw in five rows ; median row large, transversely 

 elliiDtical, side rows with small romidish or oval teeth. Each ramus of lower jaw 

 with three rows of teeth ; outer row small and round ; middle row somewhat 

 larger, transversely oval ; inner row large, very broad, but short, elliptical, smooth, 

 faintly arched, or flat. Cutting-teeth chisel-shaped. 



Zittel has reconstituted the genus Coelodus (" Handbuch der PalsBontologie," 

 vol. iii., p. I., p. 249), and along with the species described by Heckel has included 

 all those teeth previously described as species of Gyrodus and Pycnodus, possessing 

 the characters given above, amongst others the types of a number of teeth 

 occurring in the Swedish Cretaceous rocks, which Agassiz described as Pycnodus 

 suhclavatus from the Maestricht beds. 



Coelodus (^Pycnodus) suhclavatus, Agass. 

 (PL XLIL, figs. 16-18.) 



A number of teeth in the collections from Stockholm and Lund may be 

 relegated to this genus. The largest tooth is slightly imperfect, one extremity 

 being broken. The part preserved is 0'023 m. in length, and 0-007 m. in breadth ; 

 it is thick and massive ; surface of the crown smooth ; subclavate in outline. A 

 sliffht fold of the enamel extends round the base of the crown. Under surface 

 hollow and rough, for attachment to the jaw. Other specimens are smaller, 

 having a length of 0*017 m. 



A group of five teeth (fig. 17) from the right ramus of the lower jaw exhibits 

 three large teeth from the inner row, and a portion of the fourth, and a smaller 

 one from an outer row. They are attached to a portion of the jaw having the 

 ordinary open, spongy texture. 



Two small, round teeth, apparently belonging to the same species, have been 

 found in the Faxe or Coralline limestone. 



Formation and Locality. — fitage S^nonien Superieur : Kbpinge. Etage S^nonien 

 Inferieur : Ignaberga ; Faxe, Coralline limestone. 



Ex coll. — Riksmuseum, Stockholm ; University Museum, Lund. 



