F. R. Cowper Reed— The Boldceveld Beds.,jS. Africa. 303 



The South African form, however, appears sufficiently distinct 

 from all the (lescribed species oi Bmhiola to warrant a separate 

 specific designation, and the name snbpalmata is accordingly 

 proposed as indicating its nearest ally. 



' BuoHiOLA sp. ind. 



There is another species of Buchiola occurring in the nodules 

 from the Zwartberg Pass, but I have only been able to discover 

 impressions of portions of the exterior surface or imperfect internal 

 casts. It is characterised by the ribs being very flat and scarcely 

 elevated above the shallow grooves, and by both being of equal 

 width. The ribs are broad and few in number, and bear arched 

 stride ; but the material is too poor for further details. B. anguUfera, 

 Roemer,^ appears to resemble it in the character of the ribs. ' 



XocaZ%.— Zwartberg Pass. 



" NucuLiTES cf. SMitni,. Clarke., 



One specimen of a shell belonging toithe geuus NucuUtes occurs 

 on the same slab of greyish micaceous clay as Tentaculites crotalinus 

 and Ptychospira variegata, and comes from an unknown locality. 

 It consists of a right valve (with the ends slightly broken) of an 

 elongate species, having the clavicular ridge set unusually far 

 forward in front of the beak, which is placed at about two-fifths the 

 length of the shell from the anterior end. The general shape of 

 the shell, position of the beak and clavicular ridge, more resemble 

 N. Smithi, Clarke,^ from the Devonian of Brazil, than the allied 

 iV. africaniis (Salter) ^ from the Bokkeveld Beds ; and it is also 

 comparable with N. elongalus (Conrad) of the Hamilton Group of 

 New York. 



Dimensions : 



Length ... ... ... ca. 20 mm. 



Height ... ... ... ca. 12 ,, ■ 



Locality. — Unknown. 



Nyassa ARCrUTA, Hall (?). (PI. XVI, Figs. 3, 3a.) 



One somewhat imperfect internal cast of a lamellibranch from the 

 Zwartberg Pass shows the following characters : — Shell elongated, 

 oval, slightly curved, widest in front, narrowing a little posteriorly, 

 and obliquely truncated behind. Valves gibbous, especially in 

 anterior portion, not compressed nor flattened behind. Beaks low, 

 subterminal, very broad, obtuse, rounded ; a strong curved umbonal 

 ridge runs to postero-inferior angle of shell ; and a broad, well- 

 marked, but shallow depression, widening below, extends obliquely 

 from beak in front of ridge to inferior margin, occupying nearly 

 two-thirds the length of the shell. Hinge-line arched ; inferior 

 margin broadly and rather deeply sinuated ; anterior end broadly 



' Beushausen : op. cit., p. 337, pi. xxxv, figs. 18, 19. 



~ Clarke, PalaBoz. Faunas of Para : Archiv Mus. Nac. Rio de Janeiro, vol. x 

 (1899) (English edit.), p. 71, pi. viii, fig. o. 



^ Sharpe: Trans. Geol. Soc, ser. ii, vol. vii, p. 211, pi. xxvii, fig. 2 (? 4). 

 Reed: Ann. S. Afr. Mus., vol. iv, pt. 6 (1904), p. 256. 



