272 The American Naturalist. [March, 
only, and that intercentra are present. This reference by Dr. Seeley 
is essentially final, the only question being the minor one of the 
name of the suborder. In all important respects Pareiasaurus agrees 
with the Diadectidae, hitherto known only from the Permian forma- . 
tion of North America, and must be placed in the same sub-order. In 
the American forms the temporal fossa is overroofed in the same man- 
ner, and the ribs are single-headed. The articular face of the diapoph- 
ysis is, however, prolonged downwards to the level of the centrum 
in the Diadectidz, though it originates entirely from the neural arch. 
Both types must be placed together in the suborder Cotylosau- 
ria, a name which has priority over Pariasauria. To the same order 
must be referred the genus Phanerosaurus Von Meyer, from the Per- ° 
mian of Saxony. In his studies of the relations of the intercentra to 
the vertebree and the occipital condyle, Dr. Seeley has quite over- 
looked my own conclusions, with which he agrees, which I published 
in 18843 and 18864 
The memoir on the Theromorous reptiles (‘“‘ Anomodontia’’) cov- ~ 
ers a wider range than those above mentioned, and concludes with 
some general conclusions as to the systematic arrangement of the 
order. Especially important is the description of the scapular arch in 
Procolophon, which turns out to have a well-developed coracoid and 
separate epicoracoid, which, with the clavicle and interclavicle, give 
the most monotrematous shoulder-girdle yet seen in the Theromora. 
Other important contributions are the descriptions of limb-bones an 
shoulder and pelvic girdles in Dicynodon, Hyorhynchus, Eurycarpus, 
etc. There is more information as to the characters of the skeleton of 
the South African Theromora to be found here than in any memoir yet , — 
published. In the systematic, several new divisions are introduced. * 
The first, the Procolophonina, may turn out to be included in Baur’s 
Proganosauria ; but it is manifestly as well distinguished from the Pely- 
cosauria, Cotylosauria, Anomodontia, and Placodontia as these are from 
each other. For the entire order Dr. Seeley uses the name Anomo- 
dontia, which we think should be restricted to the group to which Pro- 
en originally gave it, viz.: the Dicynodontia of Seeley. 
The Gennetotheria (Seeley) do not seem to me to be distinguished 
m the Theriodonta of Owen, with which the Pelycosauria is more or 

3 AMERICAN NATURALIST, p. 37, On the Batrachia of the Permian period of N. — 
America. 
* Transac, aga Philosoph. Society, p. 243, On the Intercentrum of the Terres- 
trial Vertebra 

