[lambe] progress of VERTEBRATE PALAEONTOLOGY 19 



to the museum of Queen's University, Kingston, Ont., and the natural 

 cast in the overlying layer of rock to the Geological Survey. 



6, Upper Carboniferous fauna. — The fish-fauna of the Upper 

 Carboniferous rocks is small numerically compared with the number of 

 Amphibians recorded. The remains of the latter as well as those of 

 the fish are principally from the South Joggins, Kova Scotia. 



Elasmobranchs of the order Ichthyotomi are represented by the 

 Pleuracanthids Dittodus acinaces and D. penetrans, the descriptions of 

 which are based on teeth from Pictou, N.S. Other forms founded on 

 Selachian teeth are Ctenoptychius cristatus from the South Joggins 

 and Psammodus sp? from Pictou. Gyracanthus duplicatus is a very 

 perfectly preserved ichthyodorulite from the South Jogging. The 

 Dipnoans include the Dipterid species Conchodus pUcatus from the 

 same locality. The Teleostomeg, Crossopterygians of the suborder Pihapi- 

 distia are Rhizodus lancifer, Strepsodus dawsoni and Parabatrachus 

 maxillaris, from Horton and Pictou, from Pictou, and from Cape 

 Breton island respectively. Sir William Dawson assigned teeth and 

 scales from Pictou, with some doubt to Newberry's species Megalichthys 

 (Bhiziodus) lancifer from the Coal Measures of Ohio. Dr. Hay, in his 

 " Description of some vertebrates of the Carboniferous Age,'' basics a 

 new species, Strepsodus dawsoni, on the Pictou scales, as he is of the 

 opinion that they are quite different from those of Ohio, siuggesting for 

 the teeth the retention of the name under which they are referred to in 

 the " Acadian Geology," although not certain that they are not those of 

 an Amphibian. Parabatrachus maxillaris {Megalichthys hibherti), 

 with which Psammodus bretonensis, Whiteaves, according to Hay, is 

 sjnonymous, belongs to the Osteolepidae and concludes the list of 

 fishes from the Coal Measures. 



The class Amphibia, as here referred to, is understood to include 

 the two subclasses Stegocephalia, Cope, 1868, and Batrachia, Brogniart, 

 1800. The Stegocephalia are further subdivided into (T) Lepospondyli, 

 Zittel, (II) Temnospondyli, Zittel, and (III) Labyrinthodontia, Owen. 

 The Lepospondyli include the suborders: 1, Branchiosauria, Fritsch, 

 2, Microsauria, Dawson, and 3, Aistopoda, Miall. Dr. Hans Gadow^ 

 hag recently placed the Microsauria definitely in the class Keptilia with 

 ordinal rank ( Microsaur i) in the subclass Prosauria. 



An undetermined species of Sparodus is so far the only representa- 

 tive of the Branchiosauria from the Coal Measures of Nova Scotia. Of 

 the Microsauria the ten species included in the genera Ilylonomus, 

 Smilerpeton, Hylerpeton, Fritschia and Amblyodon are all from the 

 South Joggins. The Labyrinthodontia still further increase the number 



^ Amphibia and Reptiles, by Hans Gadow, London, 1901. 



