Reports and Proceedings — Geological Society of London. 4-3 



Museum (Proc. Geol. Assoc, vol. x. p. 315, pi. i. figs. 5, 6), the hone 

 named maxilla is truly the premaxilla, while the so-called pre- 

 maxillary tooth pertains to the palatine element. Numerous scales 

 of Cladocychis not only add this genus to the list from Manitoba, but 

 likewise appear to be referable to a species known from Nebraska, 

 namely, C. occidentalis, Leidy. A. S. W. 



IRIEIPOIRTS A.2ST1D PBOCEEDHsTG-S. 



Geological Society of London. 



I.— November 20, 1889. -W. T. Blanford, LL.D., F.R.S., President, 

 in the Chair. 



The Secretary announced that a series of specimens from the line 

 and the neighbourhood of the Main Reef, East and West of Johannes- 

 burg, Witwatersrand Gold Fields, had been presented to the Museum 

 by Dr. H. Exton, F.G.S., and a letter from that gentleman in ex- 

 planation of them was read. In this Dr. Exton stated that all but 

 one of the mines represented were on the main reef of the district, 

 which has a general direction east and west, its dip varying gene- 

 rally from 45° to 80°. South of the main reef and parallel to it at 

 a distance of 15-20 feet is a narrow reef known to the miners as 

 the " south leader," and generally much richer than the main reef. 

 The gold-bearing deposits consist of conglomerates, specimens of 

 which, and of a purplish-red rock which forms a jagged ridge at 

 some distance north of and parallel to the so-called reef, were con- 

 tained in the collection. 



1. " On the Occurrence of the Striped Hyaena in the Tertiary of 

 the Val d'Arno." By R. Lydekker, Esq., B.A., F.G.S. 



A portion of the left maxilla of a Hyama, in the British Museum, 

 containing the entire carnassial, the hinder half of the third pre- 

 molar, and traces of the inner extremity of a molar, was referred by 

 the author in 1885 to H. striata, and provisionally regarded as of 

 Pleistocene age, but subsequently concluded to have been of Upper 

 Pliocene age. The author has also referred a right upper carnassial 

 of a Hyaena from the Red Crag to the same species, on the supposi- 

 tion that Prof. Gaiidry's reference of H. arvemeusis to H. striata 

 was correct. In the present case, Dr. Weithofer has concluded that 

 H. arvemensis is entitled to rank as a valid species, and has accepted 

 the author's determination of the Red-Crag form, thereby implying 

 that the identification of the latter with H. arvemensis was erro- 

 neous. Dr. Weithofer also states that all the specimens from the 

 Pliocene of the Val d'Arno which have come under his notice are 

 more nearly allied to the Crocutine group. 



In the present paper, measurements of the recent, Red Crag, and 

 Val d'Arno specimens referred by the author to H. striata were 

 given, and the differences shown to be within the limits of individual 

 variation, whilst the actual contour of the teeth corresponded, leading 

 the author to maintain the correctness of his original determination. 



After comparison of the British Museum specimen with the upper 



