66 



THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. 



MEASUREMENTS OF THE TYPE OF MAZONERPETON COSTATUM MOODIE. 



No. 800 (777), Yale University Museum: mm - 



Length of portion of skull preserved . 14 



Length of right clavicle 16 



Width of right clavicle . . 4 



Length of dorsal region represented . . .30 



Length of cervical rib 8 



Length of dorsal rib 6-5 



Length of caudal rib 3 



Length of caudal portion of body preserved. . . 55 



No, 



Length of mandible .15 



Greatest width 6 



Length of right humerus. ... 10 



Greatest width of humerus 2 



804 (332), Yale University Museum: 



Length of rib 1 1 



Width of head of rib ^ 2 



Diameter of shall . I 



Sparodus sp. (?). 



DAWSON, Phil. Trans. Roy. Sue. London, pt. n, p. 643, pi. 40, tigs. 52 to 56, 1882. 

 DAWSON, Proc. and Trans. Roy. Soc. Canada, xii, p. 75. i95- 



Type: Specimen in the Peter Rcdpath Museum of McGi!! University. 



Horizon and locality: Coal formation at the South Joggins, Nova Scotia. 



The material on which the above determination is based was collected in 1878 

 by Sir J. W. Dawson in the coal formation at the South Joggins, Nova Scotia. 

 Nothing has been collected since that date 

 that would give additional information as 

 to the nature of the form represented. I 

 give here Dawson 's description of the 

 remains : 



"In the coaly matter or mineral charcoal 

 at the base of tree No. 10 appeared a few frag- 

 ments of an animal which may possibly belong 

 to the above-named genus of Fritsch, though 

 I am by no means certain of this identification 

 or of the real nature of the animal. 



"The skull is represented by a fragment of a maxillary or intermaxillary bone, with 

 blunt conical teeth. It is smooth or marked merely with microscopic dots. There is also a 

 fragment which may be a palatal bone studded with minute teeth. 



"A few vertebrae associated with the above bones are long and narrow, with large zyga- 

 pophyses and long neural spines. Length of body (i.e., of the vertebra) about 3 millimeters. 



"With these remains are a few bony scales different from those of any other species 

 found in these trees, and more resembling scales of Ganoid Fishes. They are somewhat 

 rectangular in form, enameled on the surface and beautifully sculptured with waving lines. 



"In the same trunk were found some teeth and bones referable to Hylerpcton dawsoni, 

 and it is not impossible that the remains above referred to may have belonged to some crea- 

 ture devoured by that animal, and which would not otherwise have obtained admission to 

 the interior of an erect tree. The tree itself had been removed by the sea, all but a little 

 of the base, and this was in a very unsatisfactory state, so that doubt might even exist as to 

 the limit between the deposit in the interior of the tree and that under its base." 



FIG. 1 5. Type material of Sparodus, consisting t A a, 

 a tooth (X 25); b, four of the smaller teeth (in 

 maxilla?) (X 25); r, three bony scales (X 5); d, 

 fragment of a limb bone (X 2); e, a vertebra (X 2). 

 (After Dawson.) 



