1906.] ON MAMMALS FROM NOIlTtf-EAST TRANSVAAT.. 575 



characteristic. Whct}u3r the specimen was a reversion to those 

 existing species which had a corn[)]ete orbit, or whether it was 

 simply a case of imlividnal vai-iation, 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 impregna,ted 

 with impurities ; the composition of these calculi being usually 

 50 p. c. ammonio-phos. of magnesium, 20 p. c. of cnlcic phosphates, 

 with soluble salts and fatty material — as shown in the. concentric 

 rings. 



The following papers wei-e read ; — 



1. The Rudd Exploration of South Africa.— V. List of 

 Mammals obtained by Mr. Grant in N.E. Transvaal. 

 By Oldfield Tpiomas, F.JL8., and Hakold Schwann, 



f'.z.s. 



[Ileceived 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 

 Eay and Pretoiia to the Zoutpansberg District of the Transvaal, 

 a i-egion hitherto practically untouched, so far as the collections 

 in the National Museum are concerned. Indeed, the whole 

 drainage-area of the Limjiopo had been remarkably little worked, 

 such few collections as had been sent from within it having been 

 from its northern pai't in Matabililand or the westei-n 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 be- 

 longing 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 tlie low veldt, and Woodbush on the high veldt ; 

 and these localities are so distinct from each other both geo- 

 graphically 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. Klein Letaba. 

 Klein Letaba is situated in about 23° 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. 



* P. Z. S. 1906, p. 159. 

 Proc. Zool. Soc— 1906, No. XXXIX. 39 



