NATURAL HISTORY SOCIETY OP GLASGOW. 265 



without assigning to it any specific name, only one specimen being 

 known to me. Since then additional material has been obtained, 

 and Mr. Davidson has done me the honour, in the lately published 

 Supplement to his " Monograph of British Carboniferous Brachio- 

 poda," to connect my name with it. The additional specimens 

 have been obtained chiefly by Mr. Bennie in the East of Scotland : 

 but some time ago I was shown examples collected in the West 

 by Mr. John Smith of Kilwinning. Those gathered by Mr. 

 Bennie prove that in some an additional rib occurs on each 

 side of the fold of the dorsal valve, and that in fact the ribs are 

 mere rounded undulations of the surface of the valves, rather 

 than true ribs in the sense in which the term is usually applied in 

 the Brachiopoda. The surface of the type specimen was smooth, 

 but in one or two there are traces of papillae, as in other forms of 

 Spiriferina. 



Locality and Horizon. — Bruntsfield Colliery, near Penicuick, in 

 shale above the No. 2 Limestone of the Lower Carboniferous Lime- 

 stone group (Mr J. Bennie). 



4. Notes on Chonetes polita (M'Coy), PI. VI., figs. 2 and 3. — 

 In the Geological Magazine for March, 1878, I briefly referred 

 to the occasional ornamentation of this shell with faint radiating 

 ribs, a peculiarity not mentioned in the original description by 

 Professor M'Coy, nor in Mr. T. Davidson's later remarks. Some 

 examples of C. polita appear to be quite smooth, others, on the 

 contrary, have unquestionable traces of close rounded faint and 

 direct radiating striae, covering the whole of the ventral valve, 

 and usually more apparent from the visceral region forwards, 

 leaving the latter more or less smooth. 



Locality and Horizon. — Catcraig Quarry, near Dunbar, in shale 

 above the Catcraig limestone ; Ladedda Quarry, near Ceres, Fife, 

 in shale above the limestone ; both horizons in the Lower Car- 

 boniferous limestone group (Mr. J. Bennie). 



5. On the punctate structure of the shell in Orthotetes cre- 

 nistria (Phill.), PI. VI., figs. G-8. — Some time ago very fine 

 examples of Orthotetes crenistria, var. senilis (Phill.), were forwarded 

 to me by Mr. E. L. Jack, F.G.S., from the Permo-Carboniferous 

 beds of Northern Queensland for description, and certain of them 

 for presentation to the Geological collection of the British Museum. 

 The Queensland specimens have, in common with British examples, 

 the semi-conical ventral valve, with step-like interruptions pro- 



