Brachiopocla from the. BokJceveld Beds. 187 



Family ATHYEID^. 



EETZIA cf. ADEIENI De Verneuil. 



(Plate XXIII., figs. 6, 7.) 



In Bain's Collection in the Museum of the Geological Society there 

 is one specimen of a plicated terebratuliform shell labelled ^' Atrypa 

 {fide Salter)," but no mention of it appears in Sharpe's description of 

 the Cape brachiopods in this collection. 



There are several examples of a similar form (Nos. 153, 138) in the 

 present collection, but none in a very good state of preservation. 

 One fairly good cast of a pedicle valve (No. 153) from Gydo Pass, 

 Ceres, is of an elongated oval form with a strongly incurved beak on 

 each side of which are the narrow dental plates. The surface is 

 ornamented with 18-20 simple straight rounded ribs. In another 

 crushed and slightly distorted specimen (No. 138) of a rather 

 broader shape there are about 20-24 similar ribs, with fine concentric 

 striation visible. 



These specimens closely resemble Retzia adrieni ■'• De Vern. from 

 the Lower Devonian, B. ijrominula Eoemer,t from the Middle 

 Devonian of Europe, and Trigeria rjucrangeri De Verneuil,]; from 

 the Devonian of Asturias and North America. 



No. 153 agrees best with B. prominula in shape, but the latter is 

 stated to have 20-21 ribs. B. adrieni has only 17-20, but it is 

 generally less elongated and more subcircular. T. guerangeri has 

 22-24 ribs and much the same form as B. adrieni. 



Our material is insufficient and too imperfectly preserved to decide 

 wnthout a doubt the true position of these specimens (Nos. 153, 138, 

 &c.), but the same uncertainty is attached to the allied form Betzia? 

 wardiana Hartt,§ from the Devonian of Bolivia, and on the whole 

 it cannot be denied that they stand nearest to Betzia adrieni. 



* De Verneuil, Bull. Soc. Geol. France, ser. 2, ii. (184.5), p. 471, pi. xiv., 

 fig. 10 a-d. Schnur, Palffiontographica, v. (18-54), p. 184, pi. xxv., fig. 3 a-c. 

 Oehlert, Ann. Sc. Geol., xix. (1886), p, 24, pi. ii., figs. 11-19. Hall and Clarke, 

 Palseont. N.Y., vol. viii., pt. 2, p. 10.3, pi. 1., figs. 1-9. 



t Eoemer, Ehein. Uebergangsgeb. (1844), p. 06, pi. v., fig. 3 a-c. 



\ De Verneuil, Deser. Asie Mineure, Pal., p. 466, pi. xxi., fig. 4. Barrois, Ann. 

 Soc. Nord, ii. (1882), p. 264, pi. x., fig. 10 a-d. Kayser, Zeitschr. deut. Geol. 

 Gesell., xli. (1889), p. 294, t. xiv., figs. 3-7. Hall and Clarke, op. cit., p. 273, 

 fig. 189. 



§ Eathbun, Bull. Buffalo Soc. Nat. Sc, i., 1874, p. 245, pi. x , figs. 2-5, 8, 9, 11, 

 12, 14, 10. 



