﻿230 DK. A. VATJGHAN ON THE PAL^ONTOLOGICAL [May 1905, 



(see immediately below) . No doubt the fragments of crinoids 

 have been mistaken for bryozoans, on account of their peculiar 

 microscopic structure. 1 



Cleistopora-Zone. (Upper K 2 only.) 



Cleistopora aff. geometrica is abundant in certain beds. 



A very short distance north of the cliff already described, 

 and lying in a small syncline, is a red earthy limestone crowded 

 with Bhabdomeson, crinoid-debris, and small gasteropods ; the 

 following fossils 2 occur abundantly in this bed : — 



Palatal teeth. 



Scaphopod Bentalium (?). 



Pteropods Hyolithes, Tentaculites . 



Gasteropods Loxonema, Macrocheilus (?), Straparollus, 



Bellerophon; Bleurotornaria (at least 



two species); Murchisonia (two or 



three species). 

 Opisthobranch ...Act&onina. 

 Brachiopods Syringothyris aff. cuspidata, Orthotetes 



aff. crenistria, Lingula mytiloides. 



Ostracod Leper ditia (?) . 



Crinoids Debris probably of several forms. 



Clathratus-suhzone. 



This subzone presents its usual features. 

 Horizon /3 contains JSjpiriferina octoplicata. 



Resupinata-subzone. 



The following fossils have been obtained from the quarry in 

 Big Weston Wood : — 



Zaphrentis aff. cornucopia \ extremely Ortkotetes crenistria. 



Zaphrentis aff. Phillipsi J abundant, 



Spirifer aff. clathratus (rare). 



Syringothyris aff cuspidata. 



Syringothyris aff. laminosa. 



Cliothyris glabristria. 



The simultaneous occurrence of Cliothyris glabristria and 

 Schizophoria resupinata, together with the abundance of Zaphrentis 

 and the entrance of Syringothyris aff. laminosa, serves to fix the 

 position of the beds with complete definiteness, and to emphasize 

 the essential similarity of this subzone throughout the Bristol 

 area. 3 (Compare the Avon and Sodbury sections.) 



Laminosa-suhzone. 



At the base of the Caninia-Oolite, Orthotetes and Chonetes are 

 abundant, in association with an occasional specimen of Syringo- 

 thyris aff. laminosa. 



1 Dr. F. A. Bather has kindly confirmed the fact, that the most abundant 

 organisms seen in a thin section of the Avon ' Bryozoa-Bed ' are fragments of 

 crinoids. 



2 The determination of the genera may need revision, as I have no special 

 knowledge of Carboniferous gasteropoda. I have to thank Mr. W. H. Wickes 

 for his kindness in presenting me with my best material. 



3 Large palatal teeth, similar to those found in the same subzone in the 

 Avon section, are occasionally obtained from this quarry. 



Leptena 



Schizophoria resupinata. 

 Bhipiclomella aff. Michelini. 

 Productus aff. semireticulatus. 



