324 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 9, 
DESCRIPTION OF PLATE XXII. 
In all the figures the same parts are indicated by the same letters. 
Fig. 1. Front view. Fig. 2. Oblique view of front and left side. Fig. 3. View 
of under surface. Fig.4. Back view. Reduced. 
ns. Anterior pillars of neural spine, thrown backwards, downwards, and 
towards the left by pressure. 
ns’, Posterior pillars of neural spine. 
or. Vertical ridge, rough for attachment of an interspinous ligament. 
prz. Prezygapophyses. 
n. Interprezygapophysial notch, =zygantrum. 
z. The inner articular surface of the right praezygapophysis, forming one 
side of the notch. 
w. The vertical wedge-plate descending from the junction of the post- 
zygapophyses to the crown of the neural canal, which, when the verte- 
bre are articulated, is received into x, the notch between prz. It has 
-been dislocated towards the left. 
ps2. Postzygapophyses. 
np. Neurapophyses. 
g. Groined interior arch. 
ne. Neural canal. 
fl. Its floor. 
c. A small portion of the upper part of the centrum immediately under ji. 
tr. ‘Transverse process. 
cs. Costal facet. 
plt. Horizontal platform. 
btt. Vertical buttress-plate descending from platform to centrum. 
Discussion. 
The Prestp—nt remarked on the combination of strength and 
lightness in the bone, which in this respect was not unlike the 
vertebree of the back of the ostrich. 
3. Note on the MippiE Liss in the Nortu-xast of [REvanp. 
By Rap Tare, Esq., Assoc. Linn. Soc., F.G.8. 
Portiock in his ‘Survey of Londonderry’ makes no mention of the 
presence of the Middle Lias in Ireland; and an examination of the 
species of fossils collected by him proves that no higher member of 
the Jurassic series than the Lower Lias is represented by them. In 
a former communication* I demonstrated the presence of the whole 
series of the Lower Lias, and, till recently, was unaware of the occur- 
rence of strata newer than that formation. 
Mr. William Gray has sent me several blocks of a grey, marly, 
micaceous sandstone, charged with organic remains of Middle Li- 
assic age; these were obtained near the town of Ballintoy, “ in fields 
faces exceeds the vertical (Owen) ; while in this Streptospondylus the reverse 
obtains, the vertical diameter of the best-preserved articular face (the hollow, 
posterior one) exceeds the transverse. ° 
* Quart. Journ. Geol. Soc. vol. xxui. p. 297 (1867). 
