2J:4 Annals of the South African Museum. 



is as follows : Shell of moderate size, closely involute, somewhat 

 laterally compressed, with outer whorl increasing rapidly in height 

 but less rapidly in breadth, with a very faint lateral revolving 

 furrow on each side at about half its height, giving a slightly 

 trilobed appearance ; dorsal side of broad median lobe flattened with 

 broad revolving peripheral band ; mouth expanded vertically, but 

 not much laterally ; umbilicus deep and small, but not angular ; 

 traces of fine revolving lines near margins of umbilicus ornamenting 

 surface of shell. 



Dimensions. — Height of shell 20 mm. ; height of outer whorl near 

 mouth 12 mm. ; transverse diameter at base of mouth 17 mm. 



Affinities. — This form is allied to B. (Plectonotus) salteri, Clarke,* 

 from the Devonian of Brazil, but it is more laterally compressed 

 and the outer whorl apparently increases more rapidly in height. 



Locality. — (No. 108) Eoad-cutting, north of Whupperthal. 



LOXONEMA sp. 



(PI. XXX., fig. 8.) 



On one slab of rock there are several hollow casts of a small 

 gasteropod (No. 164) which appears to be referable to Loxonema. 

 The shell is slender, tall, turreted, of about 11-12 whorls (only 7 

 are preserved in the best specimen), tapering very gradually to the 

 apex. Apical angle 20°-25°. Whorls very slightly swollen, very 

 slowly increasing in size ; suture line shallow, oblique, inclined to 

 the axis at 60°-70°. Surface of whorls ornamented by fine transverse 

 lines ; a shallow depressed band runs below each suture line. 



Dimensions. — Length of shell (estimated) about 18 mm. ; length of 

 7 whorls 12 mm. ; diameter near mouth 4-5 mm. 



Affinities.— Hhe, species described briefly by Ulrich t as Loxonema 

 sp. a from the Devonian of Bolivia tapers too rapidly to be considered 

 identical. Hall's species L. delpliicola I from the Hamilton Group 

 appears to be more closely allied to our form. 



Loccdities. — (No. 164) Gydo Pass, Ceres. (No. 163) Gamka 

 Poort. 



* Clarke, op. cit., p. 39, pi. iii., tigs. 12, 13. Katzer, oj). cit., p. 201, t. 

 iig. 10a, b. 



t Ulrich, op. cit., p. 39, t. ii., fig. 5. 



I Hall, Palaeont. New York, vol. v., pt. ii., 1879, p. 47, pi. xiii., figs. 19-2.'5. 



