388 Annals of the South African Museum. 



Nuculites abhrcviatus (Sharpe). 



africanus (Salter). 

 ,, hranneri Clarke. 

 ,, capensis Reed. 



coloniciis Reed, 

 ,, limn lata Schwarz. 

 ,, martial IS Reed. 

 ,, ? ovatns (Sharpe). 

 ,, cf. smithi Clarke. 



From the new material submitted to me the form described as 

 N. cf. smithi can be established as a distinct new species termed 

 N. sharpei, and two more species may be recognised, one of which 

 is new to science {N. pacatus), and the other of which is probably 

 identical with the Bolivian N. benockei Ulrich. A description of 

 these is appended. 



The determination and specific separation of the more or less 

 imperfect internal casts by which the species are usually represented 

 is a matter of much difficulty and frequently of considerable un- 

 certainty, as there are intermediate varieties which appear to connect 

 several of the species together. 



NUCULITES ABBREVIATUS (Sharpe). 



There are several small typical examples of N. abbreviatus from 

 Zwartberg Pass, averaging 9-10 mm. in height and 12-13 mm. in 

 length. Some of them show the teeth distinctly, which were not 

 described by Sharpe or the author." There are 25-27 small parallel 

 curved transverse teeth in a row behind the beaks, increasing in size 

 posteriorly, while between the clavicular ridges 6-8 longer radiating 

 teeth are supported on the usual semicircular plate. All the speci- 

 mens are in the condition of internal casts. 



NUCULITES BENECKEI Ulrich, var. 



(PI. XLVIL, fig. 9.) 



There is a rather common species of Nuculites from Zwartberg 

 Pass which is probably a variety of Ulrich 's N. beneckei.i It is 

 more triangular in shape than N. branneri ; the dorsal margin 

 slopes down more obliquely ; the posterior end is narrower and 



* Eeed, Ann. S. Afr. Mas., vol. iv., pt. vi., 1904, p. 256. 



t Ulrich, Neues Jahrb. f. Miner., Beil. Bd. viii., 1893, p. 40, pi. ii., tigs. 16, 17. 



