Palmozoic Fossils. 375 



shell siibstiiiiCL' still iidlit'i-t'iit. At the b;ick of the slab there is 

 one iin|)i-ession with seiui-cnrcuhu- margin and rings of growth, 

 which may l)e put down to .S/y. orhii/iiiii . Donor : Mr. A. G. 

 Bain. Locality, Warm Bokkeveld. 



Cat. No. 26()L. Block of yellowish grey calcareous sandstone 

 with casts of Sp. antarcticus along with Sp. orhignul, the two 

 species ver-y strongly separated by the straight and backwardly 

 projecting beaks in the respective casts. 



Cat. No. li}3 and 134. Calcareous standsone matrix (Fossilife- 

 rous sandstone) with blue shale sometimes micaceous, with Spiri- 

 fer antarcticus in all states of preservation. A loose internal cast 

 shows the pedicle and dorsal valves, and an impression of the 

 outer surface of the pedicle valve with the Sp. aogeli radial stria- 

 tions ; another shell shows the external aspect of the dorsal valve. 

 The forms are wide, with a slight rounding of the extremities of 

 the ala^ ; hinge area closely striated ; lines of growth strongly 

 marked towards the margin. The shell substance is partly present 

 or at least, the re|)lacement in calcite, and shows the massiveness 

 of the shell aliout the beak ; in one, the internal septum dividing 

 the beak at the point is shown. Ghonetcs and Lcptoawlia occur 

 on the slab. Donor : Mrs. Martin. Locality, Montagu. 



Cat. No. 2000. Donor : Geological Commission. Locality; 

 Witzenljerg Valley. Ma>-ked !)y Mr. Reed Sp. cf. pcdnidnus ; it 

 agrees with the specnnen I hgure as Sp. antarcticus. 



Spirifer cptes. Reed. . 



PI. VII., Fig. 6. 



lyOiJ, Spirifcr acres, Reed. 



Ann. S.A. Mus. Vol. IV., p. 181, pi. XXII., fig. 7 ; pi. XXIII., 



liK. 1. 



These forms have the appearance of being varieties of Sp. 

 orbiyitiji and of Sp. antarcticus. They are usually associated with 

 overgrown specimens of the shells with a greatei- number of ribs, 

 and are found in a clayey matrix. Mr. Reed separates Sp. ceres 

 fi'oni Sj). /unr/rinsi, Morris and Sharpe, owing to the latter 



