20 JProfessor T. Franklin Sibly — 



but was unable to alter the name in the Linnean paper, for it would 

 have involved too much explanation. Because, evidently, fig. 1, 

 pi. xxvili, of the Linnean Trans, is a synthetograph — the details 

 of the coils taken from an example of Anomia trigonalis (refigured 

 M.C. ii, pi. cxxv, fig. 1) enlarged, revised, and adapted to an outline 

 of An. striata ; the large specimen of which he evidently used as 

 the basis of his communication. This species he had from Derby- 

 shire and Cork (M.C. ii, p. 125). 



The genosyntypes, therefore, of Sowerby's Spirifer are really the 

 Terebratulm of Lamarck with triangular foramen, the Anomitce 

 figured and named by Martin, in which Sowerby had found spirals 

 (M.C. ii, p]3. 141, 142). These are An. striata and An. trigonalis 

 which he had confounded with it — the Van Diemen's Land specimens 

 may be ruled out. The authors who have chosen An. striata to be 

 the genolectotype seem to be quite within their right. In that case, 

 choice having been made, it stands good. 



On the Distribution of Prodactus humerosus{ = suhlaevis) 

 and the Zonal Range of the "Brachiopod. Beds" 



of the Midlands. 



By Professor T. Feanklin Sibly, D.Sc, F.G.S., Armstrong College, 

 Newcastle-upon-Tyne. 



IN 1908 the Productus hmnerosus beds in the Carboniferous Lime- 

 stone of Caldon Low, N. Staffs, were tentatively assigned to the 

 Lower Dihunophyllum zone, D^, of Vaughan's classification. The 

 slender evidence for this correlation was set out in my paper on 

 the Midland Area.^ 



More recently the researches of Mr. L. M. Parsons in Leicester- 

 shire have estabhshed the Dibimojohyllum age of the well-known 

 Productus humerosus beds of Breedon-on-the-Hill and Breedon 

 Cloud. Mr. Parsons showed that the dolomites with Productus 

 humerosus in those localities contain Cyrtina septosa, a well-known 

 Di shell ; that they are overlain conformably by dolomites with chert 

 which yield, at Breedon Cloud, a rich J)o-z fauna of corals and 

 brachiopods ; and, further, that they are underlain conformably, 

 at Breedon-on-the-Hill, by beds with Litliostrotion irregidare and 

 Cyathophyllum aff. murchisoni.'^ The position of the Productus 

 humerosus beds of Leicestershire at the top of the subzone Di was 

 thus firmly indicated, and the above-mentioned correlation of the 

 beds at Caldon Low incidentally received confirmation. 



Li the interval it had become known, through the researches of 

 Delepine and Vaughan, that Productus sidAcBvis de Koninck, a species 

 which includes Pr. humerosus, Sowerby, occurs persistently and 

 abundantly on a much lower horizon in Belgium and in the 



1 Quart. Journ. Geol. Soc, vol. Ixiv, 1908, p. 44. 



2 ibid.^ vol. Ixxiii, 1918, pp. 94-100. 



