428 Rejmrts and Proceedings — Geological Society of London. 



of the Great Fish Eiver. It is now preserved in the Albany 

 Museum. The slab containing it is of hard siliceous sandstone, and 

 is 31 inches long by ten inches wide. It is split so as to expose 

 a portion of the skull, the vertebral column and ribs as far as the 

 pelvis, the scapula, part of the humerus, the femur, and parts of the 

 tibia and fibula. The tail and left hind-limb, and apparently part 

 of the right fore-limb, are lost, owing to the jointed condition of the 

 rock. The bones have decomposed, and are represented by natural 

 moulds from which a beautiful cast was obtained by means of 

 a gelatine mould prepared in the Geological Department of the 

 Natural History Museum, before the specimen was returned to 

 Grahamstown. It indicates an animal about 2 feet long, exclusive 

 of the tail, and standing probably about 8 inches high ; it was 

 not more than 6 inches wide in the fore part of the body. The 

 animal was of great mobility, capable of easily bending the body, 

 and, by straightening the limbs, of occasionally raising its height 

 to 10 inches or more. It is a new type of Theriodont reptile, 

 contributing important facts to the osteology of the gi'oup, and 

 especially in regard to the natural association of the bones. It 

 is possibly to be included in the Cynodontia, from which it differs 

 in characters of the ilium, scapula, and skull. 



2. " Fossils in the Oxford University Museum. — IV. Notes dn 

 some Undescribed Trilobites." By H. H. Thomas, Esq., B.A., F.G.S, 



Two new species of Dalmania from the Wenlock Shales and one 

 of Olenus from the Shineton Shales of Shropshire are described in 

 this paper. The specimens on which the first species of Dalmania 

 is founded were collected by the late Dr. Grindrod at Malvern 

 Tunnel. The species has a strong resemblance to certain varieties 

 of D. caudatus, especially those more nearly approaching D. longi- 

 caudatus ; its nearest ally seems to be D. nexilis. Among its 

 characters are spines round the head, the height of the head-shield, 

 and the distance between the eyes. The type-specimen of the 

 second species came from the Wenlock Shale of Builth. The 

 Shineton specimen was presented to the Oxford Museum by the 

 Eight Eev. Bishop Mitchinson. 



3. " On Eadiolaria from the Upper Chalk at Coulsdon (Surrey)." 

 By W. Murton Holmes, Esq. (Communicated by W. Whitaker, 

 Esq., F.E.S., F.G.S.) 



The radiolaria described in this paper were contained in the 

 cavities of two small flints which were thrown out of the new 

 cutting between Coulsdon Station and the new Merstham Tunnel on 

 the L.B. & S.C. Eailway. They were probably derived from the 

 zone of Holaster planus. After treatment with hydrochloric acid, 

 the material yielded silicified casts of foraminifera as well as radio- 

 laria. The surface of the radiolaria is so much altered by corrosion 

 that specific identification is in most cases impossible. Twenty 

 genera have been recognised, and the organisms appear to belong to 

 forty-one species of these genera. A list of the radiolaria is given, 

 accompanied by a short description of each form, and four new 



