﻿Yol. 6 J.] SEQUENCE IN THE BRISTOL AREA. 201 



(4) : Bhynchonella pleurodon ' ; C 2 ; (specimens labelled ' Bh. pleuro- 

 don ' aje certainly not from this zone). 



(4) ' Lingula and Distinct ' ; C 1. 



(4) ' Chonetes hardrensis ' ; C 1 . 



(4) ' Streptorhynchus crenistria ' ; C 1 ; Orthotetes crenistria. 



(4) ' Spirifer bisulcatus ' ; C 2 ; merely denotes a Spirifer of no great 

 transversity. 



(4) ' Terehratula hastata ' ; C 2 ; possibly Cliothyris Boyssii. 



Horizon a. (Bed 6.) 



(6) (The ' Bryozoa-Bed ') ' Producta sp.' ; A ; Leptena analog a. 



Cjleistopora-Zonk. (Beds 8 to 12 and possibly 13 ; the position of Bed 13 is 

 doubtful, as the fossils recorded are not obtained from the actual Avon 

 section ; it may occur either just below or even above Bed 14, or it may 

 be the equivalent of that bed.) 



(7) (The ' Palate-Bed ') ' Bisoina and Lingula'' ; A. 



(8) ' Camarophoria globulina '; C2; possibly Bhynchonella aff. mit- 



cheldeanensis (that is, the small globu- 

 lar form in which the pleats are few 

 and coarse, and are indistinct near the 



(8) ' Athyris Boyssii ' ; C 1 ; Cliothyris Boyssii or a mutation. 

 (8) ' Athyris lamellosa ' ; C 2 ; probably a transverse variety of 



Cliothyris Boyssii. 



(8) ' Betzia radialis ' ; A ; Bhynchonella mitcheldeanensis. 

 (8 & 13) ' Spirifer duplicicosta' ; A ; Spirifer aff. clathratus. 



(9) ' Chonetes Buchiana ' ; A ; Chonetes cf. Buchiana. 



(9 & 12) ' Chonetes sordida,' l va,r. per lata,' ' papilionacea ' ; A ; Chonetes cf. 



hardrensis. 

 (9, 11, & 13) ' Orthis resicpinata' ; A; Bhipidomella aff. Michelini & Pro- 



ductus sp. 

 (9, 11, & 13) 'Streptorhynchus crenistria,' 'var. arachnoidea' ; A; Orthotetes 



crenistria (var.). The var. ' arach- 

 noidea'' is merely the flatter valve. 

 (10) ' Bhynchonella pleurodon ' ; 2 ; a specimen olBugnax puguus is so 



labelled, but is insufficiently localized. 

 (13) ' Terehratula hastata' ' var. ficus,' ' var. sacculus,' ( var. vesica- 



laris ' ; A ; Cliothyris Boyssii (mut.). 

 (13) 'Bhynchonella acuminata''; A(?); Bugnax acuminata (a speci- 

 men is labelled ' Lr. Oarb.'). 1 

 (13) ' Spirifer mosquensis' ; A; Spirifer cf. bisulcatus, an axially-elon- 



gate variety. 

 (13) ' Spirifera glabra' '; A; ? Martinia glabra, var. linguifera (or 



Spiriferina rostrata from the Lias). 



(13) ' Strophomena analoga' ; A; Leptena analog a. 



Horizon fi. (Bed 14, and probably Bed 13.) 



(14) ' Spirifera striata' and var. ' attenuata' ; A; Spirifer aff. clathratus 



and its variety. 

 (14) ' Spirifera cuspidata ' ; A ; Syringothyris aff. cuspidata. 

 (14) ' Producta punctata' ; C 2. 



(14) ' Producta pustulosa ' ; C 2 ; probably the interior of the concave 



valve of Productus aff. semireticulatus, 

 which is not uncommon. 

 But a Productus with discontinuous ribbing does occur at 

 this horizon in the Bristol area. 

 (14) ' Athyris Boyssii ' ; ? ; Cliothyris Boyssii (mut.). 



1 I do not know Pugnax below D ; the specimen in the Stodclart Collection 

 was derived from a matrix with which I am unacquainted in the Tournaisian 

 of the Bristol area. 



