239 
Geological Society. 
series. In the lower dorsal region the ridge on the visceral surfaco 
disappears, and the centrum becomes deep. The visceral ridge re¬ 
appears in the sacrum. The caudal vertebrae are at first com¬ 
pressed, and have the articular faces oblique and slightly proccelous ; 
the chevron bones have a large single facet united by suture to the 
lower half of the articulation. In these vertebrae the visceral 
surface is rounded and narrow. The proximal end of a humerus 
and distal ends of both humeri were obtained; they are of small 
size. Several metatarsal bones and phalanges have also occurred, 
and are large in proportion to the other remains. In doubtful asso¬ 
ciation with these hones were 11 pieces of dermal armour, close]y 
resembling that of Acanthopholis. 
YI. “ On the dorsal and caudal vertebrae of Acanthopholis stereo - 
cercus, Seeley.” This species was founded on a small associated 
series of vertebrae, one of which is an imperfect cervical, 2 dorsal, 
and 8 caudal. The species differs from A. horridus, Huxley, in the 
form of the centrum, in the different character of the facets for the 
chevron bones, and in the deeper median channel of the visceral 
surface. The caudal vertebrae slightly decrease in length poste¬ 
riorly. 
VII. “ On a small series of caudal vertebrae of a Dinosaur, Acan¬ 
thopholis encercus, Seeley.” This species was founded on an asso¬ 
ciated series of 6 caudal vertebrae, which differed from those in the 
tail of A. horridus in the centrum being more elongated and con¬ 
stricted, and in the rapid diminution in length of the centra poste¬ 
riorly. Tho species is slightly larger. 
January 8, 1879.—Henry Clifton Sorby, Esq., F.R.S., 
President, in the Chair. 
The following communication was read :— 
“ Description of Fragmentary Indications of a huge kind of 
Theriodont Kcptile (Titanosuchus ferox, Owen), from Beaufort West, 
Gough Tract, Cape of Good Hope.” By Prof. K. Owen, C.B., F.R.S., 
F.G.S. 
The author stated that among the fossils recently sent to the 
British Museum from the Cape of Good Hope by Mr. T. Bain, there 
were two boxes containing specimens of a most unpromising cha¬ 
racter, there being in them no entire bones, but only numerous more 
or less water-worn fragments. Among these was found a portion 
of a maxillary showing some traces of teeth; and sections having 
been made of this bone, the remains of several teeth were displayed, 
including a canine, the preserved portion of the socket of which was 
4\ inches long. From the number and mode of implantation of the 
teeth, the author concluded that the animal to which they belonged 
resembled the Theriodont genera Galesaurus and Galenops. The 
anterior portion of the left ramus of the lower jaw, measuring 
inches in length, showed teeth presenting close analogies with 
