Ncic Fossils frovi the Bokkeveld Beds. 395 



named by Sharpe * Lcptodom^is ovatus, but if this is so the name 

 ovata is previously occupied for a Mesozoic species of Nucula, so 

 that a new specific designation is requisite, and the name nigella 

 accordingly may be given it. 



In shape and general characters it appears to be allied to 

 N. varicosa Hall,t of the Hamilton Group in North America. 



Genus GEAMMYSIA De Verneuil, 1847. 



GRAMMYSIA MONTANA sp. nov. 



(PI. XLVIII., fig. 2.) 



Shell broadly elliptical, highest in front, narrowing somewhat 

 behind beak, moderately convex. Beak broad, obtuse, incurved, 

 rising well above hinge-line, slightly directed forwards, situated at 

 about two-fifths the length of the shell from anterior end. Umbonal 

 ridge indistinct, but a broad shallow depression crosses the valve, 

 descending from the beak vertically to the ventral margin, before 

 reaching which it dies out. Anterior end of shell broadly rounded, 

 very obtuse, with small impressed lunule below beak. Dorsal 

 margin sloping downwards to narrower, more pointed posterior end. 

 Ventral margin short, nearly straight in middle. Surface of shell 

 marked by fairly strong concentric undulations and fine growth-striae. 



Dimensions. — Length 23 mm. ; height 18 mm. 



Bemarks. — There is only one left valve of this species, and it 

 comes from the Zwartberg Pass. Amongst the Brazilian species 

 described by Clarke, Grammysia lundi Clarke,]: bears a very close 

 resemblance to it, but ours has rather a narrower posterior end, and 

 a higher more obtuse anterior extremity, with the beak not quite so 

 far forward. Probably it belongs to a new species, and it may be 

 termed montana. 



Genus LEPTODOMUS McCoy, 1844. 



LEPTODOMUS ? FONTINALIS sp. nov. 



(PI. XLVIL, figs. 14, 14a.) 



There are two specimens of a new species of some member of the 

 Grammy siidaB from Ezelfontein, one of which is a perfect internal 



* Sharpe, Trans. Geol. Soc. Loncl.,ser. 2, vol. vii., 1856, p. 212, pi. xxvii.,fig. 7; 

 Eeed, op. cit., p. 259. 



f Hall, Palteont. New York, vol. v., Lamell. ii., pi. xlvii., figs. 12-23. 

 + Clarke, op. cit., p. 66, t. vi., figs. 11, 12, 13. 



