90 Reports and Proceedings — Geol. Soc. Lond. 



chevron bones, and in the deeper median channel of the visceral 

 surface. The caudal vertebra? slightly decrease in length posteriorly. 

 "VII. " On a small series of Caudal Vertebrae of a Dinosaur, Acan- 

 ihoplwlis eucercus, Seeley." This species was founded on an associated 

 series of 6 caudal vertebrae, which differed from those in the tail of 

 A. horridus, in the centrum being more elongated and constricted, 

 and in the rapid diminution in length of the centra posteriorly. The 

 species is slightly larger. 



III. — January 8, 1879. — 1. " On some Tin-deposits of the Malayan 

 Peninsula." By Patrick Doyle, Esq., C.E. (Communicated by the 

 Eev. T. Wiltshire, M.A., F.L.S., F.G.S.) 



The tin-ore of the Malayan Peninsula is obtained from " stream- 

 works " in an alluvial plain extending between a range of granitic 

 mountains and the sea. The author describes the mines of the 

 district of Larut Perak. The ore is got in open workings at an 

 average depth of about 10 feet. The tin-bearing stratum has an 

 average thickness of 4*87 feet ; it is overlain by stratified sand and 

 clay, and rests upon either porcelain clay or, sometimes, a sandstone. 

 The ore varies from a fine sand, near the sea, to a coarse gravel, 

 near the mountains, and is mixed with quartz, felspar, mica, and 

 schorl. The author is of opinion that the stratum of ore has been 

 derived from the granite of the mountain range, in which it still 

 occurs in veins, by denudation, and under conditions which still 

 exist, though in a modified form. 



2. "Description of Fragmentary Indications of a huge kind of 

 Theriodont Eeptile (Titanosuchus ferox, Owen), from Beaufort West, 

 Gough Tract, Cape of Good Hope." By Prof. B. Owen, C.B., F.E.S. 



The author stated that among the fossils recently sent to the 

 British Museum from the Cape of Good Hope by Mr. T. Bain, there 

 were two boxes containing specimens of a most unpromising cha- 

 racter, there being in them no entire bones, but only numerous more 

 or less water-worn fragments. Among these was found a portion 

 of a maxillary showing some traces of teeth ; and sections having 

 been made of this bone, the remains of several teeth were displayed, 

 incktding a canine, the preserved portion of the socket of which was 

 4^ inches long. From the number and mode of implantation of the 

 teeth, the author concluded that the animal to which they belonged 

 resembled the Theriodont genera Galesaurns and Galenops. The 

 anterior portion of the left ramus of the lower jaw, measuring 

 7^ inches in length, showed teeth presenting close analogies with 

 those of Theriodonts, and this alliance was confirmed by the study 

 of other fragments. Some of the characters presented by these 

 remains seem to suggest affinities with the carnivorous mammalia, 

 such as have been already indicated by the humeri of Theriodonts 

 and Carnivores. 



The canine tooth of the new South-African reptile, which the 

 author proposes to name Titanosuchus ferox, was six times as long 

 as that of the allied form Lycosaurus ; and we have in Titanosuchus 

 evidence of a carnivorous reptile of more carnassial type than 



