Vol. 62.I 



LIMESTONE OF THE MENDIP AEBA. 



335 



D = Zone of Dibunophyllum afl 1 . turbinatum. 



{DlBV NOPRYLL UM-Zoue .) 



General lithological character. — Massive limestones, with 

 some rnbbly limestones, and subsidiary shales. 



Coral-fauna : 



Alveolites septosa. 

 Syringopora cf. distans. 

 Syringopora cf. geniculate!,. 

 Syringopora cf. ramulosa. 

 Lithostrotion Martini and variants. 

 Lithostrotion irregulare. 

 Lithostrotion Portlocki. 

 Cyathophyllum Murchisoni and 

 variants. 



Brachiopod-fauna: 



Seminula aff. ficoicles. 



Athyris cf. expansa. 



Athyris cf. planosulcata. 



Martinia aff. lineata. 



Spirifer cf. bisulcatus. 



Cyrtina sp. 



Orthothetes aff. crenistria. 



Derby a aff. senilis. 



Ehipidomella sp. 



Productus aff. Cora, muts. 



Productus hemisphericus and vars. 



Ivoninckophylloid Cyathophylla, 



Campophyllum spp. 



Clisiophyllids of numerous types, 

 such as Carcinopliyllum 6, the 

 group of Dibunophyllum aff. /?«*- 

 binatum, and Cyclophyllum. 



Lonsdalia floriformis. 



Productus cp. 



Productus giganteus. 



Productus cf. latissimus. 



Productus concinnus, mut. D 0) and 

 vars. 



Productus aff. scabriculus. 



Productus punctato-fimbriatus, in- 

 cluding JV. aff. elegans. 



Productus sp., convergent with 

 Pr. margaritaceus. 



Chonetes aff. comoides. 



Subdivisions : — 



Dj = Subzone of Dibunophyllum 6 and Dibunophyllum (p. 

 (#(/>-subzone.) 



Special faunal characters: — 



Corals : 



The subzone is especially characterized by :■ — 



(1) The numerical maximum of the Clisiophyllids. The most abundant 



forms are Carcinopliyllum 0, Dibunophyllum 9, and D. (p. 



(2) The great abundance of Cyathophyllum Murchisoni and its variants. 



Clisiophyllwm aff. curie eenense occurs in this subzone. 



Lithostrotion Martini and its variants are still common, though 

 greatly reduced in numbers. 



Alveolites septosa is abundant. 



Campophyllum sp. and Koninckophylloid Cyathophylla occur. 



The species of Syringopora include JS. cf . geniculata, S. cf. distans, 

 and >S. cf. ramulosa ; of these, the first is the most abundant. 



Brachiopods : 



The subzone is especially characterized by the great abundance of 

 Productus ' giganteus, ' Pr. hemisphericus, and Chonetes aff. comoides. 



2a2 



