^q_|^ SEDIMEXTARV ROCKS OF RHODESIA. 



sand near Ilitje. south of Taba Aikenjwe. In many places on 

 the plateau there are great ranges of Banded Ironstone aiu. some- 

 times other rocks running straight across the mam stream^, which 

 have to pass through them in narrow and sometmies precipitous 

 gorges This puzzled me for a long time, and it only became 

 clear on realising that the streams must have originated prim- 

 to the denudation of the sandstones, which once filled all the 

 lower ground even when they formed only a thm cappmg on the 

 rid-es Their courses were determined by the general slope 

 before this covering was removed; hence their apparent dis- 

 cordance with what now seems a much more natural direction to 

 have taken As examples of the seemingly anomalous courses 

 taken mav be instanced the cutting through of the banded iron- 

 stone range bv the Bembezi at Taba Aikenjwe, the intersection 

 bv the Gwelo River of the big ridges of Ironstone below the 

 Do-AIe-Good Mine, and the steep and narrow poorts by whicli 

 the Kwekwe and Sebakwe Rivers pass through the high range 

 of grits and conglomerates ( Arch.-ean ) near their junction 

 Aluch travelling over the country has convinced riie that nearly 

 all the ridges of Banded Ironstone, which are such a prominent 

 feature of the schist areas, are probably of pre-Forest Sand- 

 stone origin, often, no doubt, with their features considerably 

 modified or accentuated by denudation of more recent date. 



EUCRANGONYX ROBERTSI, METHUEN. A BLIND 

 Crustacean.- —A zoological discovery ot unusual mtei-es 

 has just been described and beautifully figured by the Hon Paul 

 \ Methu-n in the Proceedings of the Zoological Society toi 

 mil The animal concerned is a blind crustacean originally 

 found bv the members of the Pretoria Field ^naturalists Club m 

 the water at the bottom of a small cave at Irene, ^^^a^" ? f ° A^^ 

 it was subsequentlv taken in the Makapan Caves. This htt e 

 hrTmp-like creature, now known as Eucrangonys rohertsi, i 

 essniallv a cave-dweller, and as suc^h is perhaps the most 

 typical instance actually known from South Africa; but its in- 

 terest to zoologists centres round its probable origm, for whilst 

 the cave crustaceans must have originally come from fresh-watei 

 akes or riv s ,,,eh lake or river forms, of these Gammands, ate 

 no longer to b^ found in Africa, though they are common enough 

 i^^? he more temperate parts of both Northern and Southern 

 " emfspheres. Now the genus Eucrangonyx is also known from 

 well caves and lakes in Europe and North America, the Sou 1. 

 African species, according to Mr. Methuen, being most closeh 

 alliecui s?ructure to the species found in the well^ of Bohemia. 



South Africa, by Paul A. Methuen. 



