\ 



C.B. Honcood 4' A. Wnde—The Old Granites of Africa. 543 



Museum. The specimen was along with a number of others which 

 formed part of the late Professor Williamson's collection, and my 

 attention was drawn to it being the type by seeing a label attached 

 bearing the following inscription : " This specimen is figured in 

 Phillips' Geol. York., pi. 7, fig. 15." A comparison with Phillips' 

 figure confirmed this fact. 



On referring to the second edition (1835) of the above work, 

 pp. 116 and 181, it will be seen that the species was founded on 

 a specimen from the Cornbrash of Scarborough, in Mr. AVilliamson's 

 collection, i.e. John Williamson, the Professor's father. The species, 

 Mr. 13. B. Woodward tells me, is also figured in the first edition of the 

 Geology of Yorhshire (1829), on pi. 7, tig. 15, and is given among the 

 Cornbrash fossils on p. 145, and in the list of plates, p. 189, but is 

 nowhere actually described. 



Phillips, in his explanation of the plates (2nd ed., p. 177) says the 

 specimens in the Williamson collection figured by him in his work 

 have since been transferred to the Scarborough Museum. It would 

 appear, however, that the type-specimen of Melania vittata was, for 

 some unknown reason, not transferred along with the others. 



The late Rev. J. F. Blake, in his description of the species,' appears 

 to have noticed the absence of a type-specimen in the Scarborough 

 Museum, as he states : " Type is constituted by Phillips' figure only." 

 It would thus appear that Blake came to the conclusion that no actual 

 type-specimen existed. 



The present is a good opportunity to call attention to a mistake 

 made by both Blake- and Hudleston^ in the date of Lycett's* 

 description of this species. Both authors give 1853, whereas date 

 should be 1863, otherwise the "Supplement" reads as if published 

 before the "Monograph" of 1854. It is evident from the similarity 

 of the mistakes that Blake copied Hudleston. 



VII. — The Old Granites of the Transvaal and of South and 

 Central Africa, by Cuthbert Baring Horwood, A.R.S.M., Assoc. 

 M.Inst.C.E., F.G.S., with a Petrographical Description of the 

 Orange Grove Occurrence, by Arthur Wade, B.Sc. (Lend.), 

 A.R.C.S., P.G.S. 



(Concluded from the November Xnmher, p. 507.) 



ME,. .GEO. G. HOLMES ^ and others have observed the remarkable 

 and highly suggestive fact that not only do the schists (which 

 contain in many places interlaminated beds of quartzites and massive 

 crystalline limestone, e.g. in the Dwarsberg on the Magalakwin 

 Eiver in the jSTorthern Transvaal) appear interbedded in the gneisses, 

 but that the strike foliation and planes of schistosity of these old 

 schists and of the gneisses seem invariably to be parallel. 



This in itself appears to me to be strong evidence that these old 



1 Fatcna of the Cornbrash (Pal. Soc), 1905, p. 77. - Loc. cit., p. 77. 



s Geol. Mag., 1882, p. 244. 



1 " Suppl. G. 0. Mollusca" (Pal. Soc), 1863, p. 14. 



'" Personally c<immunicated. Also vide " Some Notes on the Geology of the 

 Northern Transvaal", by Geo. G. Holmes (Trans. Geol. Soc. S.A., 1904, vol. vii, 

 pt. i, p. 52), and A. "W. Rogers, loc. cit., p. 41. 



