“174 Geological Society. 
form of the neural chamber is compressed from side to side, and 
dilated from below upwards, especially in the region of the second, 
third, and fourth vertebree, its depth over the third foramen being 
nearly 34 inches. Indications of bone preserved on the surface seem 
to show that the neural canal was enclosed in a mere bony film. 
The indications of transverse processes show that they were directed 
forward in front, outward in the middle, and backward behind. 
The first process on the right side, which is preserved, expands 
somewhat conically outwards and forwards, and terminates in a 
large flattened facet for the ilium. For the animal indicated by this 
specimen the author proposed to found a new genus, Thecospondylus, 
and named the species 7’. Hornert. 
2. “On the Dorsal Region of the Vertebral Column of a new 
Dinosaur, indicating a new genus, Sphenospondylus, from the 
Wealden of Brook in the Isle of Wight, preserved in the Wood- 
wardian Museum of the University of Cambridge.” By Prof. H. G. 
Seeley, F.B.S., F.G.S. 
‘In this paper the author described a series of six vertebre, 
remarkable for the great lateral compression of the centrum, which 
is so narrowed inferiorly as to terminate in a sharp longitudinal 
ridge. The centra average about 33 inches in length. ‘The neural 
arches are depressed; the transverse processes are at first directed 
backward, but soon become directed outward, retaiing their 
upward direction ; the facet for the head of the rib is at first large, 
placed at the base of the transverse process, and bounded behind by 
a sharp ridge which runs to the hinder margin of the neural arch ; 
but afterwards the rib-head rfses higher, so as to be chiefly above 
the zygapophysial facets; and then it becomes smaller, the ridge behind 
it disappears more or less, and the transverse process becomes verti- 
cally compressed and thin. The author referred to other vertebre 
showing similar characters contained in the Fox Collection in the 
British Museum, but stated he had seen neither cervical nor caudal 
vertebrae of this type. The animal indicated by these remains was 
regarded by the author as constituting a new genus most nearly 
allied to Zguanodon, for which he proposed the name of Sphenospon- 
dylus; but he abstained from giving the type a specific name “in 
view of the likelihood of these vertebre pertaining to the [guanodon 
Seeleyt.” Ee ae ; 
3. “On Organic Remains from the Upper Permian Strata of 
Kargalinsk in Eastern Russia.” By W. H. Twelvetrees, Ksq., 
In this paper the author described the Kargalinsk steppe, north 
of Orenburg, as consisting of a grassy, treeless, undulating steppe, 
with sluggish, winding streams, in the banks of which, and in 
rayibes, the exposures of subsoil show only red marl or sandstone 
devoid of fossils. Mine-borings and shafts go down through red, 
yellow, and grey sandstones and red and white marls, which are 
fossiliferous wherever the beds of copper-ore exist. On the eastern 
