Geological Society. 299 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



November 12, 1890.— Dr. A. Geikie, F.R.S., 

 President, in the Chair. 



The following communication was read : — 



" On a new Species of Trionyx from the Miocene of Malta, 

 and a Chelonian Scapula from the London Clay." By It. Lydekker, 

 Esq., B.A., F.G.S. 



(i.) The anterior portion of a carapace from the Miocene of Malta 

 exhibits a divided neural between the first pair of costals, as in 

 the Indian species of Trionyx, and in Chitra. The Author de- 

 scribes this Maltese fossil, and discusses its relationship to Trionyx 

 and Chitra, and names it Trionyx melitensis. 



He notes the interest of finding another Oriental form in the 

 Miocene of the Maltese Islauds, which has already yielded a species 

 of Tomistoma. 



(ii.) A large scapula from the London Clay of Sheppey is referred 

 to Eosphargis gigas, and is considered to support Dr. Baur's view as 

 to the intimate affinity between the Dermochelyidce and Chelonidce. 



December 10, 1890.— Dr. A. Geikie, F.R.S., 

 President, in the Chair. 



The following communication was read : — 



" On certain Ornithosaurian and Dinosaurian Remains." By 

 R. Lydekker, Esq., B.A., F.G.S. 



The Author is indebted to Prof. 0. C. Marsh for the correct 

 determination of the bones described in the paper. 



1. Ornithosaurian Quadrates. — The reptilian bones in the British 

 Museum, Nos. 43034, 44183, and 41179, are Ornithosaurian quad- 

 rates. The two latter belonged to the right side of the skull. 

 The distal extremity of each forms a deeply grooved oblique trochlea, 

 above which is a nearly quadrangular shaft. To the inner side of 

 this shaft is attached, by suture, a flattened plate of bone, concave 

 internally and convex externally, representing part of the pterygoid ; 

 so that the relation of the quadrate to the pterygoid in the Omi- 

 tliosauria is the same as in the Rhynclioeephalia. 



The smaller quadrate would agree approximately in relative size 

 with the so-called Pterodactylus Manseli, Owen, and the larger more 

 nearly with the so-called Pt. suprajurensis, Sauvage, both of which 

 may be provisionally referred to Rhamphorhynchus. 



2. Tibia of Coeluroid Dinosaur. — The Author would provisionally 



