Reports & Proceedings — Zoological Society of London. 331 



which belongs to the ' intermediate chondrite ' group of Tschermak's 

 classification, was found on analysis to contain about 9 per cent of 

 nickel-iron and 7 per cent of troilite, which were disseminated in 

 small particles through a colourless matrix of enstatite and olivine 

 showing only few chondrules. — Dr. A. W. Gibb exhibited kammererite 

 from Uust, Shetland Islands. 



IV. — Zoological Society of London. 

 Maij 20, 1913.— Professor E. A. Minchin, M. A.,F.E.S., Vice-President, 



in the Chair. 

 Dr. R. Broom, C.M.Z.S., read a paper "On the South African 

 Pseudosuchian Reptile JEuparkeria and allied Genera". Besides 

 giving an account of the very completely known South African form, 

 he also discussed the structure of the Elgin allied forms, Ornithosiichus 

 and others. The group of Pseudosuchian s he regarded as an extremely 

 important primitive reptilian order, as there is good reason to believe 

 that not only does it contain the ancestor of the Dinosaurs, but also 

 the ancestors of the Pterodactyles and Birds. JEuparkeria and 

 Ornithosuchus are, in structure, almost Dinosaurs, and it is held that 

 when the bipedal habit was more fully acquired the few characters 

 not quite Dinosaurian would become Dinosaurian. Birds are held 

 to have originated from a Pseudosuchian which, by a bipedal habit, 

 had acquired a Dinosaur-like hind limb, and had then become arboreal 

 in habit and acquired the peculiar power of flight. 



June 3, 1913.— Professor E. W. MacBride, M.A., D.Sc, F.R.S., 

 Vice-President, in the Chair. 



A paper on " Some Miocene Cirripedes of the genera Hexelasma and 

 Scalpellum from New Zealand ", communicated by Dr. W. T. Caiman, 

 E.Z.S., was read by Mr. T. H. Withers, F.G.S. An account is 

 therein given of the ' gigantic Cirripede ' of New Zealand, originally 

 described as Scalpellum aucklandicum, of which remains have long 

 been known to occur in the Waitemata Beds (Miocene) of Motutapu 

 Island, Auckland Harbour. The valves of this Cirripede attain 

 a length of 8 inches, and have been previously supposed to belong 

 to a pedunculate form, but while Sir James Hector (1887) referred 

 them to the genus Scalpellum, Professor W. Blaxland Benham ^ 

 (1903) thought that they approached more closely to the genus 

 Pollicipes. From a study of the original material collected by 

 Professor James Park (1887). it is now shown that this Cirripede is 

 a sessile form allied to Balanus, and it is referred to Dr. P. P. C. Hoek's 

 recently instituted genus Hexelasma (1903). A smaller undetermined 

 species of Hexelasma and a new species of Scalpellum {semu lato) are 

 also described. These are in the collection of the Geological Survey, 

 New Zealand, and occur in the same beds as the ' gigantic Cirripede'. 



A second new species of Scalpellum is founded on some valves from 

 New Zealand, and a restoration is given, the remains being sufficient 

 to justify their reference to the sub-genus Arcoscalpellum, Hoek. 



1 Geol. Mag., 1903, p. 110, Pis. IX, X. 



