326 KANSAS UNIVERSITY SCIENCE BULLETIN. 
Ciass: AMPHIBITA, LINNE, 1758. 
Subclass: EUAMPHIBIA, Moodie, 1909. 
Order: Branchiosauria, Lydekker, 1889. 
Family: Branchiosauride, Fritsch, 1879. 
Micrerpeton caudatum Moodie. 
Eumicrerpeton parvum Moodie. 
Mazonerpeton longicaudatum Moodie. 
Mazonerpeton costatum Moodie. 
Order: (?) Caudata, Duméril, 1806. 
Family; Cocytinide, Cope, 1875. 
Erierpeton branchialis Moodie. 
Subclass: LEPOSPONDYLIA, Zittel, 1887. 
Order: Microsauria, Dawson, 1863. 
Family: Amphibamide, Cope, 1875. 
Amphibamus grandiceps Cope. 
Amphibamus thoracatus Moodie. 
Cephalerpeton ventriarmatum Moodie. 
Family: Molgophide, Cope, 1875. 
Erpetobrachium mazonensis Moodie. 
Subclass: STEGOCEPHALA, Cope, 1868. 
Order: Temnospondylia, Zittel, 1887. 
Suborder; Embolomeri, Cope, 1885. 
Family: Cricotide, Cope, 1884. 
Spondylerpeton spinatum Moodie. 
_ The discovery of the embolomerous amphibians in the Car- 
boniferous fauna is not new, since the first embolomerous form 
known in North America was described from the deposits on 
Salt Creek, Illinois, as Cricotus heteroclitus, by Cope. Later 
the same or a closely related form was discovered in Texas by 
Cope and Case and in Kansas by Williston. The form de- 
scribed here is, however, much more primitive than any of the 
species of Cricotus. The rachitomous forms of Amphibia are 
known from the Carboniferous of North America and Europe 
through the researches of Fritsch and Case. 
The content of the amphibian fauna of the Mazon Creek 
shales is peculiar on account of the presence of the four species 
of Branchiosauria. Unless Dawson’s Sparodus is an example 
of this group, the forms in the Mazon Creek fauna represent 
the only known occurrence of this order in.North America. 
Dawson was himself doubtful about the identity of the re- 
mains which he referred to Sparodus. Judging from his 
figures, there is a possibility that he may be right, since the 
form of the interclavicle is decidedly branchiosaurian, as we 
know the form of that element among the European species. 
Beside the presence of the Branchiosauria, the Mazon Creek 
