STRATIGRAPHIC AND GEOGRAPHIC DISTRIBUTION. ig 



known otherwise only from the Coal Measures of Kilkenny, Ireland. Cope referred 

 species from Linton to the genus Ceraterpeton of Huxley, from Kilkenny, Ireland, but 

 Jaekel (347) and the writer (462) have shown that the species were incorrectly assigned 

 to the genus Ceraterpeton, and that in fact they represent widely distinct genera. A 

 single species has been identified by Eastman from the Des Moines limestone of Iowa 

 as identical with one from Linton, Pleuroptyx clavatus Cope. The Linton fauna is 

 distinct from that of the Mazon Creek beds, and also from that of South Joggins, 

 Nova Scotia. 



(0) The deposits in Nova Scotia have been correlated with the Coal Measures 

 strata of the United States (Bell, Summ. Rpt. Geol. Surv. Canada, 1912, 1914, 360- 

 371). They are very near the same age as the Linton beds and come in near the base 

 of the Allegheny River series. The exposures are at the South Joggins, along the sea- 

 coast. Here in strata of clay interstratified with coal are found the erect stumps of 

 the Sigillariae, and it was in the rock within these stumps that Lyell and Dawson, in 

 1853, discovered the remains of the amphibians which they termed "reptiles." 



"The bones of Dendrerpcton hitherto found, as well as those of the smaller species, have 

 been obtained from the interior of erect Sigillariae, and all of those in one of the many beds 

 which, at the Joggins, contain such remains. The thick cellular inner bark of the Sigillaria 

 was very perishable ; the slender woody axis was somewhat more durable ; but near the sur- 

 face of the stem, there was a layer of elongated cells, or bast tissue of considerable dura- 

 bility, and the outer bark was exceedingly dense and indestructible. Hence an erect tree, 

 partly imbedded in sediment, and subjected to the influence of the weather, became a hol- 

 low shell of bark. When they remained open for a considerable time, they would constitute 

 pitfalls into which animals walking on the surface might be precipitated. When the sur- 

 face was inundated all such remains would be covered and imbedded in the sediment. 

 These seem to have been the precise conditions of the bed which afforded these remains." 

 (Dawson, 223, 1894.) 



Fifteen species have been described from the Joggins deposits. Two are known 

 from the Albion mines, south Nova Scotia, where were obtained the remains of 

 Baphetes planiceps Owen and B. minor Dawson. 



The following 17 species of Amphibia are known from the Carboniferous of 

 Canada : 



Amblyodon problematicum Dawson. Teeth and fragments. 

 Baphetes minor Dawson. An incomplete mandible. 

 Baphetes planiceps Owen. An incomplete cranium from Albion. 

 Dendrerpeton acadianum Owen. A jaw, limb bones, and fragments. 

 Dendrerpeton oweni Dawson. Phalangeal bone and fragments. 

 Eosaurus acadianus Marsh. Two dorsal vertebrae. 

 Fritschia curtidentata Dawson. A mandible, vertebras, ribs. 

 Hykrpeton dawsoni Owen. Mandible, teeth and incomplete maxilla. 

 Hylerpeton intermedium Dawson. Mandible and portions of skull. 

 Hylerpeton longidentatum Dawson. Fragments of mandible and skull. 

 Hylonomus latidens Dawson. Mandible and teeth. 

 Hylonomus lyelli Dawson. Incomplete skeleton and part of skull. 

 Hylonomus multidens Dawson. Fragments of skull. 

 Hylonomus wymani Dawson. Mandible and vertebrae. 

 Platystegos loricatum Dawson. Incomplete skull, vertebrae. 

 Smilerpeton aciedentatum Dawson. Teeth, ribs, fragments. 

 Sparodus sp indet. Teeth, scales. 



