218 
PROFESSOR H. G. SEELEY ON THE STRUCTURE, ORGANIZATION, 
include Anomodontia, Dinosauria, Crocodilia, and Ornlthosauria. The immovable 
articulation of the squamosal throughout the length of the quadrate bone removes the 
Anomodontia from the Lacertilia. The withdrawal of the pro-otic and opisth-otic 
from supporting the quadrate bone places it nearest towards the Lacertilia. HatteHa 
has a similar development of the squamosal. In both types the posterior extremity 
of the pterygoid js much expanded, and supports a columella ; there is an osseous 
inter-orbital septum ; distinct (?) epi-otic bones, bi-concave vertebrae, and a parietal 
foramen. Lizards also agree with Anomodonts in wanting the quadrate-jugal arch, 
and in having the pre-maxillary bone usually single. The Chelonian characters are 
limited to the edentulous jaws, and co-ossified mandibular rami. The Crocodilian 
characters are the pre-sphenoid keel, the expansion of the pterygoid to unite with 
it, the mandibular foramen, and reduced size of the zygomatic bone. Kesemblances 
to the Ichthyopterygia are seen in the parietal and quadrate branches of the squa¬ 
mosal, the sessile suspensorium of the quadrate, and the posterior flat opisth-otic. 
Resemblances to the Dinosauria are found in the elongate sacrum, the capitular and 
tubercular attachment for ribs on the neural arch and centrum respective!}^. This 
type of rib articulation is also spoken of as Mammalian. The ribs are continued to 
the sacrum. The author concludes that the Anomodontia are the most generalized 
order of Reptiles known. 
Professor Cope’s account of the pterygoid, epi-otic, pro-otic, columella, quadrate, 
pre-sphenoid, and other structures has hitherto only been supported by the evidence 
of diagrammatic woodcuts. 
In 1876, the Trustees published a descriptive and illustrated ‘ Catalogue of the Fossil 
Reptilia of South Africa in the Collection of the British Museum,’ by Sir Richard 
(3wen, F.R S., in which most of the figures published previously are reproduced, vdth 
representations of all the more important specimens in the collection. 
The family Cynodontia of that author’s ‘ Palfeontology ’ is now raised to the rank 
of an order, and named Theriodontia, on account of the I’esemblance of its dentition to 
that of the Mammalia. In this group are arranged various species of the genera 
Lycosuiirus, Tiyrisuchus, Cynodracon, Cynochamjysa, Cynosuchus, Gcdesaurus, Nytlio- 
saurus, Scaloposaurus, Procolophon, and Gorgonops. The last-named genus is the type 
of a family, Tectinarialia; the other genera are classed as Binarialia or Mononarialia, 
according as the external nostidls a^’e divided or single. 
The Anomodontia are sub-divided into three families. The name Dicynodontia of 
the ‘British Association Pteport,’ is replaced by the term Bidentalia ; and in this family 
are placed species of the genera Dicynodon and Ftychognathus. The family Crypt- 
odontia novv includes the genera Oudenodon, llieriognathus, and Kistecephcdiis. A 
third family, named Endothioclontia, is formed for the genus Endothiodon, which has 
the teeth spread over the palate and absent from the alveolar borders. 
In “Dicynodon Jacerticeps'^ {Joe. cit., Plate XXIIL, fig. 3, p. 30), the par-occipital 
(opisth-otic) was regarded as being confluent with the ex-occipital, as in the Crocodile. 
Its broad process is said to abut against both the mastoid (squamosal) and tympanic 
