574 Reports cO Proceedings — Zoological Society of London. 



shales and quartzites, containing a few characteristic Lower Devonian 

 fossils. These Devonian beds, though much concealed by alluvial 

 plains, form the basement of the eastern part of the ' Altaplanicie'. 



The Carboniferous formation is nowhere exposed along the line of 

 section, but an account is given of its development in the region of 

 Lake Titicaca, where the limestones contain an Upper Carboniferous 

 or Permo-Carboniferous marine fauna. 



A short discussion is entered into on the theory of the recent 

 elevation of the Andes and the origin of Lake Titicaca. 



(3) The Eastern Cordillera rises to heights of over 22,000 feet, 

 being composed chiefly of steeply dipping Devonian slates and 

 quartzites, though many of the unfossiliferous black slates and 

 greywackes of the eastern slopes most probably may be referred to 

 the Silurian, or even to an older formation. Outcrops of granite are of 

 rare occurrence along the line of section, although there is reason to 

 suppose that this rock forms the core of most of the high peaks. As 

 marine Lower Carboniferous and Upper Devonian rocks are absent 

 from this district, it is suggested that the granitic core was intruded 

 during a period of land-elevation at this time. 



II. — Zoological Society of London. 



Octoler 28, 1913.— Professor E. A. Minchin, M.A., F.P.S., F.Z.S., 



Vice-President, in the Chair. 



1. Dr. E. A. Bather, M.A., F.R.S., F.Z.S., read a paper entitled 

 " The Fossil Crinoids referred to Hypocrinus, Beyrich ". The two 

 specimens of Hypocrinus schneideri, Beyr., described by Beyrich and 

 Rothpletz respectively, are redescribed and refigured. The structure 

 of the genus is shown to agree with that of the Devonian family 

 Gasterocomidse, the content of which is discussed ; but it is suggested 

 that in this case and in that of ' Lecythiocrinus ' adamsi the distinctive 

 features may have been independently acquired. 



The holotype of Hypocrinus piriformis, Rothpletz, is redescribed 

 and refigured, and proved to be no Hypocrinus. It is thought to be 

 a highly modified descendant of the Taxocrinidae, by way of such 

 a genus as Cydonocrinus. The left posterior radial appears to have 

 borne a large arm, but the other arms are more or less atrophied, 

 and the right posterior radial has almost disappeared. 



2. A paper on '■'■ Batrachiderpeton lineatum, Hancock & Atthey, 

 a Coal-measure Stegocephalian ", communicated bv Professor J. P. 

 Hill, D.Sc, F.R.S., F.Z.S. , was read by Mr. D. M. S. Watson, 

 M.Sc. It contained the description of the skull, lower jaw, and 

 pectoral girdle of this species, based on a series of specimens in the 

 Newcastle Museum, dez'ived from the Low Main Seam of Newsham 

 Colliery. 



3. A paper, communicated by Dr. C. W. Andrews, F.R.S., F.Z.S., 

 was received from Mr. E,. W. Palmer, M.Sc, entitled "The Brain 

 and Brain-case of a Fossil Ungulate of the genus Anoplotherium^', 

 in which a cranium from the Phosphorites of Quercy, together with 

 an exceptionally perfect and well-marked brain-cast obtained from 

 it, were described from material in the British Museum collections. 



