442 Dr. Wheelton Hind — British Carboniferous Goniatites. 



that species. Hang, Mem. Soc. Geol. France, Pal., torn, vii, p. 90, 

 Las expressed the same view. Hind & Howe, on the strength of 

 the locality quoted in the Cat. Foss. Ceph. Brit. Mus., p. iii, 

 erroneously recorded this species as passing up into the Coal- 

 measures (Q, J.Gr.S., vol. Ivii, app. B). 



Yorkshire: The G. reticulatum heds of Horsebridge Clough. 



Lancashire : Sabden Shales of Rough Lee. 



Staffordshire : River Dane, W. of salmon ladder. 



Devonshire : Mincing Lane, near Exeter. 



Ireland: Rathcahill and Foynes Island, co. Limerick; Puffing- 

 hole, Kilkee, co. Clare ; Coor Spa Well, near Ennis. 



Gltphiocekas excavatum, Phillips. G. crenistria zone. 

 Derbyshire : Castleton, Thorpe Cloud, Park Hill. 

 Staffordshire : Narrowdale. 

 Isle of Man : Poolvash. 



Scotland: Upper Limestone Series: Orchard, Gare, Thornliebank. 

 Lower Limestone Series: Thornton. 



Glyphioceras bidorsale, Phillips. 

 A species of doubtful value. The late Mr. Crick referred 

 a specimen in my collection from Horsebridge Clough to this species. 

 Foord & Crick, op. supra cit., think it may be a form of 

 G. reticulatum, and observe that the double median saddle on which 

 Phillips founded the species does not exist in well-preserved 

 examples. 



Glyphioceras beyrichianum, de Koninck. Middle Pendleside Series 

 to Millstone Grit. 



This species has a most variable form. In the young stage the 

 umbilicus, is wide and deep, inclusion small, the shell strongly 

 marked with transverse ribs, the periphery broad and flattened, 

 and like G. reticulatum has a central spiral sulcus. 



In more mature shells the inclusion is more complete, the ribs 

 more delicate, and the periphery more convex. Hang (op. supra cit., 

 p. 92) describes and figures seven distinct varieties, all of which 

 seem to come from Chokier. Similar varieties occur at Lisdoonvarna, 

 CO. Clare, and Rough Lee near Sabden. 



My own observations lead me to suppose that the young stage of 

 all the varieties are identical and occasionally persist, but the 

 species was plastic and adopting new forms, or there may have been 

 actually crossing going on between G. reticulatum and G. leyrichi- 

 <inum. Many specimens are very difficult to refer definitely to one 

 or other of these species. 



Gastrioceras circumplicatile, Foord , is probably a variety of th e species. 

 Haug points out that G. diddema is a synonym of G. striolatum, 

 Phillips, and that as he adopts the latter as a distinct species the 

 name diadema disappears and' G. leyrichianum, de Kon., 1843, takes 

 its place. 



Lancashire: Sabden Shales, Rough Lee (Millstone Grit). 



Yorkshire: Gillbeck, S.E. of Lothersdale (Millstone Grit); Horse- 

 bridge Clough, Hebden Bridge. 



