Nctv Fossils from thi' Bokkcrchl Beds. 'i^l 



Diyncnsions : — I. IT. 



Height of shell 32 mm. about 29 mm. 



Dicameter of umbilicus 12 about 12 



Transverse diameter of 



mouth about 55 about 54 



Diameter of whorl at base 



of shell 8 8-5 



Diameter of whorl before 



apertural expansion... 25 27 



In specimen II. the dorsum near the mouth is imperfect, while the 

 right lateral margin of the mouth is well preserved ; but in speci- 

 men I. the dorsum and notch are perfect and the superior apertural 

 margin is entire on the right side, though the lateral margins are 

 broken. 



PTEROPODA. 



Genus HYOLITHES Eichwald, 1840. 

 HYOLITHES SUBtEQUALIS (Salter). 



There is one specimen of this pteropod in the present collection 

 from an unknown locality, but in much the same kind of rock as that 

 from Gydo Pass, and the block also contains Nuculites shaiyei and 

 Palaoneilo riulis. Salter's definition was previously quoted by me,"= 

 but his figures i are poor. This example is more trigonal than he 

 indicates, and in every respect more resembles H. schcncki Ulrich, 

 to which I have considered the species closely allied. 



Its length is 28 mm., and its width at the aperture 9 mm. Its 

 rate of tapering is about 20-25'^ 



LAMELLIBRANCHIATA. 



Genus NUCULITES Conrad, 1841. 



The following nine species of Nuculites have been previously 

 recorded from the Bokkeveld Beds, of which one {N. o vat us Sharpe) 

 is doubtfully referable to the genus : — 



* Reed, Ann. S. Ah-. Mus., vol. iv., pt. vi., 1904, p. 247. 



t Salter, Trans. Geol. Soc, ser. 2, vol. vii. (185G), p. 215. woodcuts, figs. 3, 4, 

 p. 214 . 



