332 Geological Society. 
PROCEEDINGS OF LEARNED SOCIETIES. 
GEOLOGICAL SOCIETY. 
June 21, 1893.—Dr. H. Woodward, F.R.S., Vice- 
President, in the Chair. 
The following communications were read :— 
1. “On Two Dinosaurian Teeth from Aylesbury.” By R. 
Lydekker, Esq., B.A., F.G.S. 
Two teeth from the neighbourhood of Aylesbury, believed to be of 
Portlandian age, may be referred to the same species as is a tooth 
figured by De La Moussay from the Portlandian of Boulogne. The 
Aylesbury teeth are described in the paper, and the nature of the 
animal which possessed them is discussed. 
2. “ On anew Plesiosaur from the Waipara River, New Zealand.” 
By Capt. F. W. Hutton, F.R.S., F.G.S, 
This specimen was shortly described by Sir James Hector in 1873. 
The Author considers it more prudent to follow Mr. Lydekker in 
referring all the known New Zealand Cretaceous Sauropterygians 
with which he is acquainted to Leidy’s genus Cimoliosaurus, and 
he therefore describes this form as a new species of that genus. 
3. “Observations on the Affinities of the Genus Astrocenia.” By 
Robert F. Tomes, Esq., F.G.S. 
Researches recently made by the Author relative to the structure 
of certain undoubted Astrocenie of the Gosau beds, having for their 
primary object the better understanding of the supposed species of the 
genus obtained from the Glamorganshire conglomerate, have been 
productive of results which will render a complete modification in 
the classificatory position of the genus imperative. 
The Author gives a new definition of the genus, in which he does 
not at present include any species of an earlier date than the Cre- 
taceous period, all the so-called Jurassic Astrocenie being referable 
to other and quite distinct genera. 
4. “Description of a new Genus of Madreporaria from the 
Sutton Stone of South Wales.” By Robert F. Tomes, Esq., F.G.S. 
In the Quarterly Journal for 1885 is a detailed description of a 
coral from the Sutton Stone named <Astrocenia gibbosa. This spe- 
cimen is not the type of the species, and a re-examination of it by 
the Author has proved that it is not an Astrocenia. Two other 
specimens have also been examined, and as a result of examination 
of the three the Author is enabled to found a new genus Styloseris, 
of which a diagnosis is given, and the specific name gibbosa is 
retained for this, the only known species. The genus will take its 
place near Clausastrea, from which it differs by possessing a well 
developed columella and increasing by both fissiparity and gemmation. 
