376 Albany Jluseuni Recor(h. 



being more mucronate and transverse. Exactly the same varia- 

 tion can be seen in specimens of Sp. antarcticus where the impres- 

 sion of the external shell may show well-rounded alfe, and the 

 internal cast of the same shell show sharp points owing to the 

 matrix not having penetrated to the margin. Morris and Sharpe 

 state that the hinge area in Sjk haivkinsi extends the whole width 

 of the shell, but their figure of the brachial valve shows the outer 

 halves of the hinge line to be bent downwards, so that the hinge 

 line would be abbreviated. The high angle of the apex of the hinge 

 area in Reed's fig. 1, PI. XXIII. and of the specimens in the 

 Albany Museum suggest the same thing. The internal cast of the 

 beak is in the same plane as that of the cast of the shell surface, 

 as in Sj/. roifarctwus, but in Sjj. haivkinsi it rises away from the 

 plane as in Sp. orhkjnyi. I feel very doubtful whether Morris 

 and Sharpe's type has not been badly figured and described, and 

 that the specimens which we must call Sp. ceres are not really 

 referable to S}). hairJfinsi. The species seems very close to Sj>. 

 .yieriDsus, and von Bueh mentions one form from the Spiti shales 

 in Thibet which also seems to have some resemblances ; this form 

 is figured but not named* and von Buch mentions that the striae 

 of growth project like scales. 



I cannot agree with Mr. Reed that Sp. Jauru-sodrea?ius of 

 Katzer is identical with Sp. ceres^ ,- if the latter species is to be 

 superseded it should be in favour of Sj/. limrliinsi. 



Cat. No. 2r)07 and 2599. Donor : Geological Commission. 

 Localit3% Slang Fontein Road Quarry, Warm Bokkeveld. Ventral 

 valves. 



Cat. No. 49. Donor : Mr. A. G. Bain. Locality, Warm Bok- 

 keveld. Dorsal valve. 



PALAEONEILO, Hall. 



This genus is repiesented by the following species in the 



*Royle, J. F. Illustrations of Botany and other branches of Natural 

 History of the Himalayan Mountains, 2 vols. Folio, 1839, 100 coloured 

 plates. 



'Eeed, Ann. S.A. Museum, Vol. IV., p. 194. 



