SUPPOSED MICROSAURIAN SPECIES OF UNCERTAIN RELATIONSHIP. 



177 



Amblyodon problematicum Dawson. 

 DAWSON, Phil. Trans. Roy. Soc. London, pt. n, 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- FlG 38 ._skcietai dements of Amblyodon sp. 

 what rhombic bone, with a style at one side, from the Coal Measures of Nova Scotia. 



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



may possibly be a thoracic plate or possibly a d, fragment of thoracic plate;/, shaft of 



. 1 limb bone; e, rib. 



parasphenoid. 



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

 is provisionally named Amblyodon problematicum. 



