﻿52 ME. T. F. SIBLY ON THE FAXJNAL SUCCESSION IN THE [Feb. I908, 



Analysis of faunal characters: — 

 Corals : 



Cyathaxonia rushiana and C. costata are both widely dis- 

 tributed, and the former especially occurs in considerable 

 abundance locally. These two species are not, however, often 

 found in association. 



The ZaphrentidS; which occur in abundance, exhibit great 

 variety, and include several new forms. ^ Zaj>hrentis Enniskilleni 

 is common ; Densiphylloid types, including Densiphyllum cliarles- 

 tonense, Thoms., occur abundantly ; and types of Amplexi- 

 Zaphrentis, Vaughan,^ are abundant. 



Beaumontia aff. Egertoni is very localized in occurrence, but 

 when present it is abundant. Cladochonus is locally abundant. 



All the other corals mentioned in the faunal list are of rare 

 occurrence. 



Brachiopods: 



Seminula amhigua and S. glohularis are common locally. 

 Martinia glabra is frequently abundant. 



Sjph'ifer hisulcatus is abundant. Variants of that form towards 

 Sp. grandicostatus occur locally, and typical specimens of the 

 latter species are occasional. 



Syringoihyris suhconica is characteristic, but very rare. 

 S. aff. laminosa, identical with the form figured by Davidson, 

 ' Monogr. Brit. Foss. Brachiop.' (Palaeont. Soc.) vol. ii (1858-63) 

 pi. vii, figs. 21 & 22, occurs very rarely. Typical specimens of 

 Spiriferina octoplicafa occur. 



Orthothetes cf. erenistria is not uncommon. 



Camarotoecliia (?) aff. Jlexistria occurs rarely. ^Numerous 

 crushed specimens, of a Ehynchonellid which I refer doubtfully to 

 this species, occur in the shales of this subzone in certain localities. 



Pt'odvctus giganteus occurs in abundance, and all the varieties 

 found in D^ are represented. Pr. latissimus is rare. Pr. striatus 

 generally occurs, and is abundant locally. 



Productus concinnus and Pr. Martini always occur. The former 

 is often exceedingly abundant. Large forms of Pr. semireticulatus 

 are locally abundant. 



Typical specimens of Productus costatiis and Pr. scabricidus 

 are not uncommon. The typical form of Pr. longispiniis attains 

 its maximum in this subzone, and is locally very common. Pr. aff. 

 setosus occurs, and a characteristic variant, Pr. tissingtonensis, is 

 locally common. 



Productus punctatus is common. Pr. pustulosus is rare ; but 

 an allied form, with very numerous, small spine-bases and 

 indistinct concentric banding (compare Pr. ovalis, Phil.), is locally 

 common. 



^ No description of the Zaphrentids is given in the present paper, for it 

 would be unprofitable to attempt the description of any new forms until I 

 have completed a thorough examination of the very large number of speci- 

 mens which I have collected. 



'^ Quart. Journ. Geol. Soc. vol. Ixii (1906) pp. 315-16 & pi. xxix, fig. 7. 



