556 MR. J. A. "DOUGLAS ON THE [Nov. 1909,, 



D x = Subzone of Dibunophyllum 6 and <£ (0, </> subzone). 

 Special faunal characters: — 

 Corals : 



The simple Clisiophillids, such as Dibunophyllum d and D^ 

 muirheadi, are abundant throughout this subzone. 



Carcinophyllum sp. is common at the base, where it is asso- 

 ciated with Clisiophyllid Lithostrotions. 



Lithostrotion martini is still abundant, but becomes replaced 

 by L. irregulare. 



Lithostrotion affine occurs commonly near the base, and 

 L. junceum makes its appearance towards the summit. 



Alveolites septosa is also common at this level. 



Syringopora geniculate/, is rare, except near the base. 



Gyathophyllum murchisoni is prolific at certain levels. 

 Brachiopods : 



Productus aff. giganteus is abundant, but the typical form of 

 this species has not been recorded. A small form of Pr. punctatus- 

 is very characteristic of this subzone, but Pr. hemisphericus is 

 never common. 



Daviesiella aff. comoides occurs sparingly. 



Seminula ambigua mut, D v Dielasma aff. virgoides, D. cf. ficus, 

 Athyris planosulcatd, and Reticularia lineata are all of common 

 occurrence, especially near the base. 



One of the most characteristic features of this subzone in 

 County Clare is the abundance of large Euomphali of the type of 

 Euomphalus acutus. 



D 2 = Subzone of Lonsdalia floriformis (Lonsdalia subzone). 

 Special faunal characters: — 

 Corals : 



Lonsdalia duplicata is abundant near the summit, but L. flori- 

 formis has not been recorded. 



Dibunophyllum, near \p, is the only other commou Clisiophyllid ;. 

 but this is of local occurrence. 



Cyathophyllum regium is common. 



Lithostrotion junceum and L. irregulare are abundant. 



Alveolites septosa and Syringopora cf. geniculata are rare. 



Campophyllum sp., Carcinophyllum sp., and Diphyphyllum 

 subibicinum occur locally near the base. 

 Brachiopods : 



Productus giganteus reaches the acme of its development, and 

 Pr. striatus and Pr. i corrugato - hemisphericus ' are locally 

 abundant. 



Cyrtina septosa is common in certain localities, and has not 

 been recorded outside this subzone. 



Athyris expansa and Chonetes cf. hardrensis occur sparingly. 



