188 Annals of tlie South African Museum. 



Dwiensions. — (No. 153) Length 16 mm.; width 11 mm. (No. 138) 

 Length 17 mm. ; width 14 mm. 



Localities.— {^o. 153) Gydo Pass, Ceres. (No. 138) Uitkomst, 

 Ceres. (No. 166) Gydo Pass, Ceres. (No. 221) Gamka Poort. 

 (No. 98) Ceres. 



EHYNCHOSPIEA ? cf. SILVETI, (Uhich). 

 (Plate XXIIL, figs. 8, 9.) 



It is certain that there is a small plicated centronellid in the 

 collection closely allied to, if not identical with the species described 

 by Ulrich-'= as Centronella ? silveti Ulrich, from the Devonian of 

 Bolivia. The shell is oval in shape and shows from 12 to 16 simple 

 rounded radiating subequal plications, strong near the margin but 

 becoming weaker towards the beak. The pedicle valve has a small 

 pointed beak and a longitudinal median groove bordered by ribs rather 

 larger than the rest. Ulrich (oj). cit.) describes Centr. silveti as 

 having 18 ribs, but his figures only show 12-14, and they are indi- 

 cated as becoming weaker and almost obsolete near the beak. The 

 median groove on the ventral valve is also clearly shown. Hartt's I 

 Betzia ? jamcsiana is apparently closely allied ; it is described 

 as having 14-20 low rounded simple radiating plications which 

 die out near the beak. Centr. bergeroni Oehlert,:j: is also closely 

 related. 



The precise generic position of these small brachiopods must be a 

 matter of uncertainty till we become acquainted with their internal 

 structure, but it appears most probable that they belong to the genus 

 Bhynchospira. § 



Dimensions. — Length averages 6 mm. ; width averages 5 mm. 



Localities.— {^o. 130) Slang Fontein, Ceres. (No. 131) Warm 

 Bokkeveld, Ceres. (No. 136) Near Ceres Village, along the Valsch 

 River. (No. 153) Gydo Pass, Ceres. (No. 221) Gamka Poort. 

 (No. 181) Gydo Pass, Ceres. 



* Ulrich, Neues Jahrb. f. Min., Beil. Bd. viii., 1893, p. 51, t. iv., 

 fig. 15 a-d. 



t Rathbun, Bull. Buffalo Soc. Nat. Hist., i., 1874, p. 243, pi. x., figs. 23, 

 27-38. 



+ Oehlert, Bull. Soc. Et. Scient. Angers, 1885, p. 1, figs. 1-9. 



g Clarke, Palseoz. Faunas of Para, Brazil (Archiv. Mus. Rio de Jan., x., 1899), 

 p. 89, English edit., 1900. 



