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Show 1 9 0 6 .] ON MAMMALS FROM NORTri-EAST TRANSVAAL. characteristic. Whether the specimen was a reversion to those existing species which had a complete orbit, or whether it was simply a case of individual variation, it was difficult to ascertain. Mr. Holding also exhibited a large calculus weighing 5 lb. 6 oz., taken from the descending colon of a Horse, and remarked that calculi were fairly common amongst older horses bred and reared in towns, where there was a preponderance of dry and impure food, and where, as in London, the water was largely impregnated with impurities; the composition of these calculi being usually 50 p. c. ammonio-phos. of magnesium, 20 p. c. of calcic phosphates, with soluble salts and fatty material-as shown in the concentric rings. ______ The following papers were read;- 1. The Rudd Exploration of South Africa. - V. List of Mammals obtained by Mr. Grant in N.E. Transvaal. By O l d f i e l d T h o m a s , F.R.S., and H a r o l d S c h w a n n , F.Z.S. [Received May 11, 1906.] After completing the work at Knysna, of which we gave an account in our last paper*, Mr. Grant journeyed by way of Delagoa Bay and Pretoria to the Zoutpansberg District of the Transvaal, a region hitherto practically untouched, so far as the collections in the National Museum are concerned. Indeed, the whole drainage-area of the Limpopo had been remarkably little worked, such few collections as had been sent from within it having been from its northern part in Matabililand or the wrestern in Bechuanaland, the Limpopo part of the Transvaal having been quite neglected. In this interesting region Mr. Grant has worked with his usual energy and success, and his collection includes 250 specimens belonging to 51 species. This fine series, by Mr. Rudd's generosity, is, as before, added to the treasures of our National Museum. The localities at which the collection was made were two- Klein Letaba on the low veldt, and Woodbush on the high veldt; and these localities are so distinct from each other both geographically and zoologically, that we have thought it advisable to separate altogether the collections received from them and to write two distinct lists as follows :- I . K l e in L e t a b a . Klein Letaba is situated in about 2o~ 21 S. and 30" 40 E., on a branch of the Letaba River, which runs south-eastwards to join the Olifants River, uniting again still further eastwards with the main stream of the Lower Limpopo. It is at an altitude of about 1000 feet to the east of and below the high range of the Drakensberg. * F.Z.S. 1906, p. 159. P roc. Z ool. Soc.-1906, No. XXXIX. 39 |