332 Geological Society. 



PROCEEDINGS OF LEAEXED SOCIETIES. 



GEOLOGICAL SOCIETY. 



June 21, 1893.— Dr. H. Wood\vard, F.R.S., Vice- 

 President, in the Chair. 



The following communications were read : — 



1. "On Two Dinosaurian Teeth from Aylesburj-," By R. 

 Lydeklcer, 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 ^oussay 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 a new Plesiosaur from the "Waipara River, Xew 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 CimoUosaurus, and 

 he therefore describes this form as a new species of that genus. 



3. " Observations on the Affinities of the Genus Astrocoenia." By 

 Robert F. Tomes, Esq., F.G.S. 



Researches recently made by the Author relative to the structure 

 of certain undoubted Astrocoeaice 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 Astrocoenice being referable 

 to other and quite distinct genera. 



4. " Description of a new Genus of Madrejooraria 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 Astrocoenia gihhosa. 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 Astrocceniu. 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 Sti/Joserin, 

 of which a diagnosis is given, and the specific name gibhosa is 

 retained for this, the only known species. The genus will take its 

 place near CJausasircea, from which it differs by possessing a well 

 developed columella and increasing bybothfissiparity and gemmation. 



