Class Amphibia Linné, 1758. Devonian to Recent. Subclass Euamphibia Moodie, 1909. Coal Measures to Recent. Order Branchiosauria Lydekker, 1889. Coal Measures to Permian. Family _Branchiosauridæ_ Fritsch, 1879. _Micrerpeton caudatum_ Moodie, Mazon Creek. _Eumicrerpeton parvum_ Moodie, Mazon Creek. _Mazonerpeton longicaudatum_ Moodie, Mazon Creek. _Mazonerpeton costatum_ Moodie, Mazon Creek. _(?) Sparodus_ sp. indet. Dawson, Nova Scotia. Order Caudata Duméril, 1806. Coal Measures to Recent. Suborder Proteida Cope, 1868. Coal Measures, Eocene, and Recent. Family _Cocytinidæ_ Cope, 1875. _Cocytinus gyrinoides_ Cope, Linton, Ohio. _Erierpeton branchialis_ Moodie, Mazon Creek. _Hyphasma lævis_ Cope, Linton, Ohio. Order Diplocaulia Moodie, 1912. Coal Measures to Permian. Family _Diplocaulidæ_ Cope, 1881. _Diplocaulus salamandroides_ Cope, Salt Fork, Illinois. (?) Order Salientia Laurenti, 1768. Coal Measures (?) to Recent. Family _Peliontidæ_ Cope, 1875. _Pelion lyelli_ Wyman, Linton, Ohio. Subclass Lepospondylia Zittel, 1887. Coal Measures. Order Microsauria Dawson, 1863. Coal Measures. Family _Hylonomidæ_ Fritsch, 1883. _Hylonomus latidens_ Dawson, Nova Scotia. _Hylonomus lyelli_ Dawson, Nova Scotia. _Hylonomus multidens_ Dawson, Nova Scotia. _Hylonomus wymani_ Dawson, Nova Scotia. _Smilerpeton aciedentatum_ Dawson, Nova Scotia. _Hylerpeton dawsonii_ Owen, Nova Scotia. _Hylerpeton intermedium_ Dawson, Nova Scotia. _Hylerpeton longidentatum_ Dawson, Nova Scotia. _Fritschia curtidentata_ Dawson, Nova Scotia. _(?) Amblyodon problematicum_ Dawson, Nova Scotia. Family _Tuditanidæ_ Cope, 1875. _Tuditanus punctulatus_ Cope, Linton, Ohio. _Tuditanus brevirostris_ Cope, Linton, Ohio. _Tuditanus minimus_ Moodie, Cannelton, Pa. _Tuditanus longipes_ Cope, Linton, Ohio. _Tuditanus walcotti_ Moodie, Linton, Ohio. _Erpetosaurus acutirostris_ Moodie, Linton, Ohio. _Erpetosaurus minutus_ Moodie, Cannelton, Pa. _Erpetosaurus obtusus_ Cope, Linton, Ohio. _Erpetosaurus radiatus_ Cope, Linton, Ohio. _Erpetosaurus sculptilis_ Moodie, Cannelton, Pa. _Erpetosaurus tabulatus_ Cope, Linton, Ohio. _Erpetosaurus tuberculatus_ Moodie, Linton, Ohio. _Odonterpeton triangularis_ Moodie, Linton, Ohio. Family _Stegopidæ_ Moodie, 1909. _Stegops divaricata_ Cope, Linton, Ohio. Family _Urocordylidæ_ Lydekker, 1890. _Diceratosaurus punctolineatus_ Cope, Linton, Ohio. _Diceratosaurus lævis_ Moodie, Linton, Ohio. _Diceratosaurus robustus_ Moodie, Linton, Ohio.