478 REPORT—1874. 
Vertebral centra elongate, contracted in the middle. 
Lepterpeton, Urocordylus, Keraterpeton, Ophiderpeton, Dolichosoma, Dendrerpeton, 
Hylonomus. 
Superior and inferior processes of caudal vertebre expanded distally. 
Urocordylus, Keraterpeton f. 
Limbs wanting. 
Ophiderpeton, Dolichosoma. 
Ventral armour consisting of scutes in a chevron pattern. 
a. Chevron pattern continuous. 
Urocordylus $. 
b. Chevron pattern reversed behind. 
Archegosaurus. 
TABLE OF DISTRIBUTION. 
Abbreviations :—C. Carboniferous. P. Permian. B. Bunter. M. Muschelkalk. 
K. Keuper. R. Rhetic. O. Oolite. 
| Central India. 
| South Africa. 
Nova Scotia. 
| United States. 
| England. 
| Scotland 
Treland. 
| France. 
| Germany. 
| Russia. 
Australia. 
| 
| 
| 
Mastodonsaurus, Jég. 
eiganteus, Jig. M.?, K., R. 
ar ieee OES enti 
‘urstenberganus, Meyer. B. 
vaslenensis, Meyer. B......... ‘ 
Gani} WE Sno .cindaocn on can sot auenlllRe. wales arte 
Capitosaurus, Miinst. 
arenaceus, Miinst. B.?, K. ....)..]..]..]..] 
robustus, Meyer. “K........... a5 Ist |s Galficet |e 
Pachygonia, Hux. 
imcucvata, zee. MTIASSIGL \.). a|lieeu|\ie es |e elles ||)"e lo | (tone ge 
Melosaurus, Meyer. 
uralensis, Meyer, =P mene bis Ria dee limarylseler| ie leo 
Trematosaurus, Braun. 
Braun, Burm. B.~s : vateswuns pciinvwe thy dal sox}. ae 
ocellaeMevyer, WBS Wesiecwe'- ole eu ei nlsysaikt> «| 
Gonioglyptus, Huz. 
longirostris, Huz. Triassic? ..|..}.cfeolee|eelsetp 
Metopias, Meyer. 
diagnosticus, Meyer. K.,R.....| x |-.] +. | +. | 
Labyrinthodon, Owen. 
leptognathus, Owen. K. ...... *% 
Dinietoonateie Mail. 
varvicensis, Miall, K. ........ re 
_#& 
* 
* * 
+ An example in the collection of the British Museum shows that the spinous processes 
are expanded, though not to the same extent as in Urocordylus. 
{. Not known to be reversed. The entire ventral armour has not been seen, 
