208 Reports and Proceedings— 
of the continent, but hitherto none have appeared in the lists of 
fossils from this formation in British localities. The collection of 
Sponges described by the author was made by the Rev. G. F. 
Whidborne. The author described 11 species (6 of which he iden- 
tified with those already described from continental localities) be- 
longing to 9 genera, and concluded his paper with some general 
remarks. These Sponges are calcareous, but are considered by the 
author to have been originally siliceous, replacement of the one 
mineral by the other having taken place as already noticed by him. 
The beds in which these Sponges are found bear all the appearance 
of being comparatively shallow-water deposits. 
4. “On the Dinosaurs from the Maastricht Beds.” By Prof. H. 
G. Seeley, F.R.S., F.G-S. 
In this paper the author described five fragmentary bones arranged 
among the remains of Mosasaurus in the Van-Breda collection when 
received by the British Museum. One of these is a femur wanting 
the distal end, and worn at the proximal extremity, 114 inches long, 
with an average thickness of about 14 inch, and “remarkable for its 
slender form, its superior bow-shape curvature, the lateral compres- 
sion of the proximal articulation, and the extent to which it is 
directed inward, for the trochanter, which is separated from the 
proximal end of the bone in front, and for the proximal position and 
small size of the lateral trochanter.” For the species indicated by 
this bone the author proposed the name of Megalosaurus Bredat. 
Another femur, slightly imperfect at its articular end, 193 inches 
long, has a remarkably straight and strong shaft, subtriangular at the 
proximal end, subquadrate in its lower part, and bearing the lateral 
trochanter in the middle, and has the proximal and distal ends modi- 
fied on the Iguanodont plan. This form was considered by the author 
nearly allied to Iguanodon, and to approach Hadrosaurus in most 
points in which it differs from the former genus. He proposed to 
establish for it a new genus, Orthomerus, and to name the species O. 
Dolloi. The collection further included a tibia and metatarsal bone 
referable to the same form. These Maastricht Dinosaurs furnish the 
most recent known evidence of the existence of the order. 
II.—March 21, 1885.—J. W. Hulke, Esq., F.R.S., President, in 
the Chair.—The following communication was read :— 
“On the Supposed Pre-Cambrian Rocks of St. David’s.” By 
Archibald Geikie, Esq., LL.D., F.R.S. (Part I.) 
The author began by briefly narrating the circumstances under 
which he had been led to study the geology of St. David’s. He had 
visited the district twice, first in company with Mr. B. N. Peach, 
with whose cooperation nearly all the field-work was done, and 
again in conjunction with Mr. W. Topley. The paper was divided 
into two parts, the first being mainly controversial, and the second 
descriptive. © Only the first part was read. 
Paxr I. 
According to Dr. Hicks there are at St. David’s three distinct Pre- 
