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



portion at the base ; the latter deeply concave. Inner coronal surface convex, 

 smooth, projecting at the base; lateral margins fine, smooth. Root deeply- 

 bifurcated in the anterior teeth ; the depth of the bifurcation diminishes in 

 the teeth situated latero-posteriorly ; forms a prominent bulb on the inside, 

 with a cori'esponding depression externally. A median groove or sulcus 

 extends vertically across the prominent part of the root. The posterior teeth 

 have a much shorter crown, and the width of the root is greater ; the latter 

 in some of the teeth exceeding the former. 



The teeth vary considerably in size, apparently according to age rather than 

 a difference in the size of the mature fish. The smaller teeth are more slender, 

 more acutely pointed, and have finer cutting edges than the larger ones, and 

 have been subject to less attrition from use. The base, whilst possessing all the 

 characters of the larger examples, has those characters less markedly developed, 

 and, agreeing with the crown, of a more attenuated nature. 



Whilst the teeth now described are in many respects similar to 0. hopei, Ag., 

 0. duhia^ Ag., and 0. suhulata, Ag., they difPer from all of them in possessing two 

 pairs of lateral denticles, and in this character they approach Odontaspis acuta, 

 Davis, from the Oligocene (Oamaru) formations of New Zealand. The example 

 from the Danien locality of Annetorp, the highest horizon from which the teeth 

 have been obtained (fig. 21), is remarkably similar to the example from 

 Trellissic (" Trans. Roy. Dublin Soc," n. s., vol. iv., pi. v., fig. 2), whilst those 

 from Oppmanna more closely approximate to the specimen represented by 

 fig. 1 {op. cit.). 



In the Danish collections this species is represented by specimens, two of 

 which are figured, from Faxe, Stevns, Annetorp, Luneberg, and Saltholm. 

 The specimen from Stevns (PI. xxxviii., fig. 23) is from the former collection 

 of the late King Christian VIII. of Denmark. 



Formation and Localities. — Etage Danien: Annetorp; Stevns; Faxe; Luneberg. 

 Senoniam II. : Oppmanna. 



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

 Mineralogical Museum, University of Copenhagen ; Zoological Museum, University 

 of Copenhagen. 



