﻿46 3IE. T. F. SIBLY OX THE FAUNAL SUCCESSI0>' IX THE [Feb. I 908, 



area, occur sparingly. Cylindrical forms, doubtfully referred to 

 Cyathophyllum Jlirrchisoni, are very rare. 



CamjiopliyUum derhiense is generally distributed, though rarely 

 of common occurrence. Caninoid forms of Campophyllum, allied 

 to C. caninoides, are locally common. 



Lithostrotion jimceum and L. Martini are abundant, especially 

 the former. Typical specimens of Lithostrotion irregular e are 

 comparatively rare, but a slightly-bigger Litliostroticm^ inter- 

 mediate in characters between L. irregulare and L. Martini^ 

 occurs very commonly. Lithostrotion aff. Portlochi occurs gene- 

 rally, and is locally abundant. L. aff, M'-Coyanum is not 

 infrequent. L. Flemingi is very localized in distribution, but 

 sometimes occurs commonly. 



Diphyphyllum Jateseptatum and closely-related forms are of 

 frequent occurrence. 



Koninckophyllum is comparatively uncommon. 



Dihv.nophyUum occurs commonly in this subzone, though rarely 

 attaining a marked abundance, A common type is Dihuno- 

 phyllum matlockensc. D. derhiense is a rare species. Small, 

 conical forms, which bear considerable structural resemblance 

 to Dihunophyllum (p, Yaughan, occur locally. 



Clisiophyllids belonging to the generic groups I{isiioj>hyUum, 

 EhodophyUum, and Cyinatiophyllurn, and exhibiting great variety, 

 occur in profusion in several localities. 



CyclophyUum aff. pachyendothecum is characteristic, but dis- 

 tinctly uncommon. Clisiophyllum aff. M'Coyanum is of rare 

 occurrence. 



Alveolites is often abundant. Syringoptora cf. distans and S. cf. 

 reticulata are both abundant forms, ^yriiig 02^07^0 cf. geniculata 

 is occasionally common. 



Jilichelinia glomeratn is of local occurrence only. Zaphrentids 

 occur somewhat rarely in the uppermost part of the subzone. 

 Cyathaxonia rushiana is extremely rare. 



^raehiopods : 



Several varieties of Spirifer hisulcatus are represented. The 

 species ranges throughout, and is frequently abundant. Variants 

 of Sp>. hisidcatus, which in shape and in the nature of their 

 ribbing closely approach Sp. grandicostatus, occur rarely. 



Spirifer planicosta is frequently common, and locally attains 

 marked abundance, 



Martinia glabra occurs abundantly ; but M. lineata and 

 Ji. ovalis are distinctly rare. 



Orthothetes cf. cre>i2Si;"ia is widely distributed, though not often 

 abundant. 



Schizophoria resipinata is generally rare, but locally it occurs 

 in some abundance. Rhipidomella aff. Michelini is very rare. 



Pi^oductus giganteus occurs in great abundance throughout this 

 subzone, and a considerable variety of forms are represented. The 



