J. W. Jackson — MoUiisca, Coal-measures, Lancashire. 451 



In workinf^ through the "Mark Stirrup Collection" in the 

 Manchester Museum I came across a specimen of a reticulate 

 GlypMoceras horn the "Tipper Foot coal, Bacup ", which Mr. Crick 

 has kindly confirmed as Olyphioceras afl. reticulato, thus constituting 

 a further record. 



The species is recorded by Dr. Hind [6, p. 538] from below the 

 Gin Mine Coal, Nettlebank (North Staffordshire Coal-field). 



GlypJiioceras aff. striolato (J. Phillips). — In 1905 the Manchester 

 Museum obtained a number of ' roof nodules ' or ' baum pots ' from 

 the Upper Foot Mine, Shore, Littleborough, and one of these nodules, 

 on development, has yielded a remarkably large form of a Glyphioceras 

 which measures 94 mm. in diameter. The specimen is slightly 

 damaged and somewhat crushed in places, but on the whole is 

 remarkably well preserved and shows the ornamentation of the test 

 to great advantage. No sutures or constrictions, however, are visible. 

 In general appearance it seems to come very near to Glyphioceras 

 striolatum (J. Phillips) \_ = diadema, Beyrich (in part)], a large 

 example of which, measuring 66 mm. in diameter, is figured by 

 Messrs. Poord and Crick from Chokier (Belgium) [8]. 



Glyphioceras diadema has been recorded by Mr. Bolton from the 

 Lower Coal-measures of Lancashire [3, pp. 396 and 413] as follows: 

 ^^Glyphioceras (^Goniatites) diadema. This species is recorded by 

 Messrs. Crick and Foord from the Coal-measures of Rochdale. Prom 

 the description of the specimen (C. 5098, Brit. Mus.) there is little 

 doiibt that the horizon is that of the Bullion or Upper Poot Seam." 



Lamellibranchia. — It is much to be regretted that the MoUusca 

 Committee of the Manchester Geological and Mining Society have 

 included in their published list [9] several forms of bivalve mollusca 

 from the Lancashire Coal-measures without first verifying the various 

 records, as this mars what might otherwise have been a useful piece 

 of work. Furthermore, it also leads one to infer, in several cases, the 

 presence of ' marine bands' at the various horizons against which the 

 species are placed. 



The following are the chief revisions that it has been found 

 necessary to make, more especially in the Wild Collection, upon 

 which a large part of the above list was based. 



" Schizodus deltoideus," from the roof of the Bullion Coal, Carre 

 Heys, Colne (Wild and Kay-Shuttleworth Collections), are now 

 regarded as S. antiqtms, Hind. They compare favourably with the 

 originals of Hind's tig. 27 of pi. xviii [10], now in the Manchester 

 Museum. The specimen figured by Wild [2, pi. ii, fig. 7] as 

 " Anthracosia, new angular sp." is considered and figured by Dr. Hind 

 as a young example of S. antiqutis [10, pi. xix, fig. 6], 



'■^ Posidonomya gihsoni." — This is a term which has been used in 

 Lancashire for two different shells, viz. Posidoniella Icevis and P. minor. 

 Its use, therefore, should be discontinued, as suggested already by 

 Dr. Hind, in order to avoid further confusion. Wild's specimen 

 (Manch. Mus., W. 630), figured as P. gihsoni [2, pi. ii, fig. 8], 

 is P. Icevis. Its horizon and locality is Sbolvfir, near Oldham, 

 Bullion Coal. 



" Nucula striata.'''' — This name appears in the Catalogue of Fossils in 



