BmcJiiopoda from the Bokkevcld Beds. 179' 



The hinge-plate is deeply notched or cleft in front, and the long 

 crura begin on each side in front of the dental sockets. 



Dimensions. — (No. 151) Length 16 mm. ; width 18 mm. 



A ffiyiities.— The shape of the shell, character of the ribbing, and 

 internal characters, so far as they can be made out, agree closely 

 with Betzia (Trigeria) gaudryi Oehlert,"'= which occm-s in the 

 Devonian of the West of France and in the Oriskany Sandstone of 

 North America. I The number of the ribs in the latter, however, is 

 rather greater. 



Localities. — (Nos. 150, 151) " Unknown." 



Family TEEEBEATULID.E. 



CRYPTONELLA BAINI (Sharpe). 



(Plate XXII., figs. 1, 2.) 



1856. Tcrehratula Bainii, Sharpe, Trans. Geol. Soc, ser. 2, vol. vii., 

 p. 208, pi. xxvi., figs. 11, 12. 



It is possible, by piecing together the evidence from various 

 imperfect specimens in this collection, to determine the generic 

 position of this species. The internal structure is well shown in 

 several of the specimens, though the loop is not preserved. We 

 may observe the muscular impressions, vascular sinuses, and curved 

 dental plates in the pedicle valve, while in the brachial valve the 

 hinge-plate and muscular impressions can be distinguished as agree- 

 ing in the main with Crypt. 2)lanirostra Hall,| to which our species 

 is very closely allied. It is probable that Ulrich's species Meristella 

 riskoivski Ulrich,§ from the Devonian of Bolivia, is a member 

 of this genus, for it apparently bears a great resemblance to the 

 Cape form and deserves comparison with it. 



Localities. — (Nos. 132, 133, 134) Kloof north-west of homestead 

 on Laken Vley, Ceres. 



* Oehlert, Bull. Soc. Et. Scient. Angers, 1883, p. 1, pi. i., figs. 1-11; pi. ii., 

 figs. 1-6; and ibid., 188,5, p. 1. figs. 1-19. 



t Hall and Clarke, Palasont. N.Y., vol. viii. (1893), pt. ii., p. '2G5, pi. Ixxv., 

 figs. 6, 7. 



I Hall, Pal. N.Y., vol. vii., pt. ii. (1893), p. 287, pi. Ixxx., figs. 5-10. 



§ Ulrich, Neues Jahrb. f. Min., Beil. Bd. viii., 1893, p. 64, t. iv., figs. 16-18. 



