72 Amphibia — Microsauria, Aistopoda, and Brancldosauria. 



Wall-case, 

 No. H. 



Table-case, 

 No. 22. 



Sub-order 1. — Microsauria. 



This sub-order contains a number of salamander-like forms 

 of Labyrinthodonts referred to the family Urocordylidce, and to 

 the genera Urocordylus, Ceraterpetum, Lepterpetum, from Kil- 

 kenny, Ii'eland, and from Bohemia. Livinerpehim, from 

 Bohemia, occupies a family by itself. The Hylonomidce include 

 Hylonomxis, Seeleya, Ricnodon, Orthopleurosanrus, all from the 

 Gas-coal of Bohemia. Microhrachis, also from Nyran, Bohemia, 

 occupies a distinct family. Most of these are represented by 

 electrotypes of the original fossils, the shales in Avhich they 

 occur as fossils being charged with pyrites, which rapidly 

 decompose. 



Wall-case, 

 No. 11. 



Table-case, 

 No. 22. 



SuB-ORDEK 2. — Aistopoda. 



In this sub-order the body is snake-like without legs, and 

 there is neither a pectoral nor pelvic girdle ; the centra of the 

 vertebraB are elongated, and the neural spines aboi-ted. It 

 includes DolicTiosoma and Ophiderpetinn (Huxley) from the coal 

 of Ireland and the Permian of Bohemia. 



Table-case, 

 No, 22. 



Wall-case, 

 No. 11. 



Sub-order 3. — Branchiosauria. 



These are short-tailed salamander-like Labyrinthodonts 

 with barrel-shaped centra, and a notochordal canal through 

 their vertebrte. 



The family Apateonid^ includes Melanerpetum from Bohemia; 

 and the family Proteitonid^ the genera Protriton of Gaiidry, 

 from the Lower Permian of Autun, and Bohemia, Sparodus and 

 Daiosonia also from the last-named locality. 



Among doubtful Labyrinthodonts may be recorded here, 

 Lepidofosaui'tis Bufii from the Middle Permian of Midderidge, 

 Durham. Some of the Ichnites (Footprints) wei-e doubtless 

 made by Amphibians ; they are mentioned under that head in 

 Gallery No. 11 (see iiifra, p. 73 of this Guide, Pig. 05). 



FOOTPRINTS.— GALLERY No. 11. 



Footprints. Wall-cases Nos. 8-10 are occupied by a fine series of Foot- 



prints and impressions mostly found in Sandstone of Triassic 

 age. Attention is directed to the large slab from near Greenfield, 

 Massachusetts, which is covered with impressions supposed to 

 be the footmarks of bipedal reptiles ; these tracks are called 

 ''Ichnites.^' 



