﻿448 DR. A. VAUGHAN OX THE PAU2s^AL SUCCESSION [Aug. I908, 



(ii) Brachiopods : 



Productus striatus, a protean species marking an old-age 

 stage in the gens of Fr. corrugatus, is common in the Cracoe 

 ^Knolls.' 



Productus jyrohoscideus, an old-age variant of the gens of 

 Pr. undatus, has been found by Dr. Wheelton Hind at Park 

 Hill and Castleton, in the highest beds of the Midland Massif. 



Ghonetes Buchiana is identical with the high-D form of 

 Dunbar and Fife, and a nearly-allied form occurs at the top of 

 the Midland Massif. 



Derhya grandis is abundant in the Millstone Grit of Pateley 

 Bridge. 



SchizojjJioria resupinata : — The giant form occurs at Astbury 

 (Staffs.) ; the spinous variant is abundant at Congleton Edge 

 (Staffs.) in beds of P-age. 



Spirifer aff. hisulcatus: — This gens splits up into several 

 highly-specialized variants, which can be matched from all 

 British areas at the same horizon. 



Martinia glabra : — The small form is extremely abundant at 

 Castleton. 



Martinia ovaliglahra occurs, in a larger form, in D3 of 

 North Wales, and beautiful specimens have been sent to me 

 for identification by Dr. Wheelton Hind and Mr. J. T. Stobbs. 



Athyris cf. planosulcata : — The form figured in this paper 

 is known from several localities at the top of the Midland 

 Massif. 



CamaropJioria cf. crumena is common at the same level at 

 Pateley Bridge. 



(iii) Lamellibranchs : 



Dr. Hind has recorded the presence of Posidonomya Becheri 

 at the top of the Midland Massif at Castleton : it occurs also 

 at the base of the Yoredales in Wensleydale {fide Dr. Hind and 

 Mr. Cosmo Johns). Its occurrence in the Pendleside Group is 

 co-extensive with the development of that group. 



Comparison of the Lower Part of P with the Highest 

 Level (the 'XnoU' Level) in the Limestone-Massif 

 of the ^N'orth-Western Midlands. 



A faunal comparison of the highest beds of the Limestone- 

 Massif at Park Hill and Castleton with P of the Loughshinny 

 sequence reveals so many points of resemblance — extending to 

 the community of peculiar, and therefore presumably short-lived, 

 variants, such as Productus ^rohoscideus — as to suggest probable 

 identity of horizon. 



If this be so, the Cyathaxonia-Beds (Dsa, Dsj) of the Irish 

 sequence are represented by massive limestone in the ' Knoll ' 

 areas of the North- Western Midlands. 



