SUPPOSED MICROSAURIAN SPECIES OF UNCERTAIN RELATIONSHIP. 



177 



Amblyodon problematicum Dawson. 

 Dawson, Phil. Trans. Roy. Soc. London, pt. 11, p. 644, pi. 40, figs. 57 to 61, 1882. 



Type: Specimen No. 3061-10, Peter Redpath Museum, McGill University 



Horizon and locality: Coal Measures of Nova 

 Scotia. 



A fragment of a jaw i cm. in length has 10 

 cylindrical teeth, simple and smooth, with large 

 pulp cavities and rounded regularly at the apices. 

 With these are 4 vertebrae of the usual type, 

 measuring together i cm. Fragments of cranial 

 bones also occur and are obscurely pitted. There 

 is also what seems to be the shaft of a limb 

 bone and a few oval scales. A flat and some- 

 what rhombic bone, with a style at one side, 

 may possibly be a thoracic plate or possibly a 

 parasphenoid. 



The material is too scanty for any satisfactory description of this animal, but it 

 is provisionally named Amblyodon problematicum. 



Fig. 38.— Skeletal elements of Amblyodon sp. 

 from the Coal Measures of Nova Scotia. 

 a, tooth, X 25; b, section of tooth, X 25; 

 d, fragment of thoracic plate; /, shaft of 

 limb bone; e, rib. 



