208 
THE GEOLOGIST. 
bony scutes on the integument of the under surface of the head ; in which 
character Micropholis has a remote resemblance to Archegosam-us. The scutes, 
however, are very different in their aspect from those of tlie last-named genus. 
Micropholis has little resemblance with any European Lahyrintliodonts, except 
Metopias, and the singular so-called " Labyrintliodon BucMandi,'" from the Trias 
of Warvvickshire, to the peculiarities of which the author alluded, proposing to 
consider it as the t3rpe of a new genus, which miglit be termed " Dasycepa." 
On the other hand, there are two southern forms of Labyrinthodonts, which 
exhibit many similarities to Micropholis. These are the BacJn/ops laiiceps of Prof. 
Owen, from Central India, and a new form allied to Brachyops, but distinct from 
it, from Australia. This last was described and named Bothriceps Australis. 
The author stated that lie was not prepared to draw any very decided conclusion 
as to the age of the Karoo- or Dicynodon-beds, fi-om the fact of the occurrence of 
Labyrinthotlont Amphibia in them, inasmuch as the Labyrinthodonts range from 
the Lower Lias to the Carboniferous Formation inclusive ; and Micropholis is 
inilike any of the Labyrinthodonts whose precise age is kno\vn. 
The fragmentary remains of a yoimg reptile, which were found associated mth 
Micropholifi, were stated by Prof Huxley to be imdouhtedly those & Dicynodon. 
Of this, however, and of a small Dicynodont skuU from the same locality, he 
promised to speak on a future occasion. 
The second part of the pajjer consisted of a description of the structure of the 
cranium, of the sclerotic ring, of a fragmentaiy sacnmi, and of the humerus of the 
new species of Dicynodon (1). Murrayi) from near Colesberg, which was charac- 
terised at a previous meeting of the Society (Februaiy 23). Particidar attention 
was directed to the unusually complete ossification of the cranio-facial axis, and to 
the striking resemblance in the structure of the bony walls of the olfactory 
apparatus to that which obtains in Birds. Prof Huxley, ui conclusion, gave a 
sketch of the general proportions of the Dicynodon, so far as the evidence yet 
obtained allows a judgment to be formed, and particularly alluded to the existence 
of a long series of caudal vertebra;. Specimens of the fossil-wood found with the 
remains of B. Murrayi had been submitted to Dr. Hooker, and declared by him to 
be coniferous. 
2. " On Rhamphorhynchus BucTclandi, a Pterosaurian from the Stonesfield 
Slate." By Thomas H. Huxley, F.R.S., Sec. G. S., Prof of Natural History, 
Government School of Mines. 
The author based liis account of this Pterosaurian upon a fine fragment of a 
lower jaw, discovered by the Earl of Ducie in the quaiTies of Sarsden, near Chip- 
ping Norton, — on a coracoid bone from the Stonesfield slate, in the collection of 
the Museum of Practical Geology,— on a large fragment of a lower jaw in the 
Museum of the Society, and a very fine specimen of a lower jaw in the Museum of 
that to which the jaws belong was admitted to be hyiiothetical, but then- propor- 
tions agree sufficiently well to give probability to the supposition. Furthermore, 
the author did not suppose it to be absolutely demonstrable that the jaws and 
coracoid in question, supposing them to be of one species, were of the same specias 
as those Pterosaurian remains discovered by Dr. Buckland in the Stonesfield 
slate many years ago, and (though never described) named after him Pteroductylus 
Bucklandi ; but, as a specific name unaccompanied by a description is of no 
authority, and as there is no evidence of the existence of more than one species of 
Pterosaurian in the Stonesfield slate, it seemed that the adoption of the specific 
name Bucklandi would have the least tendency to create confusion. 
These remains prove that the Stonesfield Pterosaurian belonged to the genus 
Rhamphorhynchws of Von Meyer, and that it had nearly twice the size of the 
liassic Dimorpthodon macronyx. The mandible of R. Bucklandi is remarkable for 
its stoutness and the depth of its rami towards the symphysis, which is short and 
produced into a stout curved median edentidous rostmm. The teeth are similar 
in form, flattened and sharp-pointed, distinct, and not more than seven in number 
on each side : the last tooth is situated rather behind the junction of the middle 
with the posterior third of the jaw. The author took occasion to refer inci- 
coracoid to the same species as 
