﻿Yd. 6 1.] LIMESTONE OE WE3TON-STJPER-MAEE DISTRICT. 557 



Seminula-Zone. 

 Coral-fauna : — 



Cyathophyllum sp. (cf. C. <p) : in the lower part of S x . 



Caninia cylindrica (?) : in S : . 



Lithostrotion Martini : very abundant throughout. 



Lithostrotion basaltiforme, var. bristolense : abundant at a certain level 



inS 2 . 

 Lithostrotion ef. Portlocki : occurs in S 2 . 

 ' Clisiophyllum' (Carcinophylluvi) 9, occurs in S . 

 ' Clisiophyllum'' (Carcinophylhom) sp. : common at the base of S l . 

 Syringopora cf. reticulata : occurs in S L . 

 Syringopora cf. distans : abundant at the base of S^ 

 Syringopora cf. genicidata. 

 Syringopora cf. ramulosa. . 



Brachiopod-fauna : — 



Seminula ficoidea : abundant throughout. 



Athyris cf. expansa : persistent throughout S ls and common at the top 



of that subzone. 

 Athyris cf '. planosulcata : not uncommon in S T . 

 ' Athyris' cf. glabristria : abundant at the base of S x . 

 Eeticularia sp. 



Spirifer cf. furcatus : abundant at the base of S r 

 Cyrtina carbonaria : abundant near the base of S 2 . 

 Camarophoria isorhyncha: abundant at the base of S 1 . 

 Orthotetes aff. crenistria : comparatively rare. 

 Chonetes papilionacea : abundant at numerous levels throughout. 

 Productus aff. Cora [unit. C] is abundant at the base of the zone, and 



ranges to the top of S T . 

 Productus aff. Cora [cf. mut. S 2 ] : occurs in S 2 . 

 Productus aff. hemisphericus : two distinct mutations are abundant, one 



in S lf the other in S 2 . 

 ProducUis 9 : recorded at various levels in St . 

 Productus punctatus: abundant at the base of S r 

 Productus semireticulatus, mut. [cf. Pr. concimms] : occurs up to the 



top of S x . 



The faunal characters of the Seminula-Zone, as displayed in the 

 Weston- Worle ridge, may be summarized as follows. The semi- 

 reticulatus subzone (S x ) is well-developed, and clearly exhibits a 

 faunal overlap between the Syringothyris and Seminula-ZonQs. A 

 remarkably-rich aud interesting fauna is found at the base of S . 

 The Com-subzone (S 2 ), so far as it is represented, exhibits a fairly- 

 normal development. 



Notes on New and Interesting Forms. 



Leptcena sp. has heen found in the upper part of C. The highest 

 record of Leptmna in neighbouring areas is at Horizon y. 



A new species of the punctatus-gvowp of Producti has been 

 recorded at the same level. This form has been found l in abun- 

 dance in S x in the Carboniferous Limestone of South- West Gower 



1 A. Vaughan, ' Notes on the Brachiopods & Corals, collected by 

 Dr. Brendon Gubbin, from the Carboniferous Limestone of South-West Gower 

 & the Zones which they indicate ' Proc. Bristol Nat. Soc. ser. 4, vol i pt i' 

 1905 (issued for 1904) p. 55. ' r ' r 



