Davis — On the Fossil Fish of the Cretaceous Formations of Scandinavia. 415 



intermediate smooth hollows. The dentinal substance, which is considered by 

 Newton to be the representative of teeth, is arranged in a series of lamellee, or 

 plates, near the anterior beak of the tooth ; but the larger number of teeth further 

 back are composed of small tubes, generally perpendicular to the surface, around 

 which the dentinal substance is deposited. The large central tooth has this con- 

 struction. The teeth vary considerably in outline in the several specimens, and 

 the jaws also offer no small variety. Compared with the English Gault specimens, 

 this one is longer from front to back in proportion to the breadth from the sym- 

 physis to the opposite margin. In this respect it also differs equally from the 

 examples from the Amuri Bluff beds in New Zealand. 



Some specimens of smaller size also occur in the collection at the Lund Uni- 

 versity ; they are imperfect, and the specific characters not well preserved. The 

 specimen represented by fig. 14 may be a part of the pre-maxilla, and the one forming 

 the subject of fig. 15 the anterior portion of the mandible. The structure of both is 

 open and porous ; the external surface is hard, smooth, and somewhat polished ; 

 the inner surface presents a more or less granulated appearance, due probably to 

 the calcification of the extremities of the tubes forming the dentinal surface. 



Formation and Locality. — Etage S(^nonien, No. 2 : Oppmanna ; Etage S^nonien, 

 No. 1: Kbpinge (figs. 12, 13). Senonien (zone with Actinocamax niammillatus, 

 Nills.) : If 5 ; Igaaberga (figs. 14, 15). 



Ex coll. — Geological Museum of the University of Lund. 



Order.— GANOiDEL 



Family.— PYCNODONTID^. 



Genus. Coeloclus, Heckel. 1849. " Beitrage zur Kenntniss der Fossilen 

 Fische Oesterreichs," pt. i., p. 202, pi. i., fig. 6. 



Pycnodus, . . . Agassiz, L., 1843. (in part.) "Rech. sur les Poiss. 



Foss.," vol. ii., pt. II., p. 183. 



This genus is distinguished by the teeth being hollow in the centre of the 

 crown (not due to attrition), and the elongated teeth being raised towards each 



