﻿244 DE. A. V AFGHAN ON THE PAL2E0NT0L0GICAL [May I905, 



Lithostrotion. 



(A) The Siphonodendro ^-Section. 

 Species-groups: — 



(1) Lithostrotion Martini. Abundant from the middle of S } ; 



throughout all higher zones ; maximum in S. 

 Mutations : — 



Towards Lithostrotion irregular c : D (common). 

 „ Lithostrotion offine : S 2 and D. 

 ,, Lonsdalia: D 2 (common). 



(2) Lithostrotion irregular e (doubtfully a distinct species- 



group). Abundant throughout D ; maximum in D.,. 



(3) Lithostrotion junceum. Never abundant, but not uncommon 



at certain levels in D. 



(B) The Nematoj^hy Hum-Section. 

 Species-groups : — 



(4) L basaltiforme : upper part of S A and lower part of S,,. 



(5) L. Portlochi (including the variants L. M'Coyanum and 



L. ensifer). D 2 (abundant). 



Cyathophyllum. 



Species-groups : — 



(1) Cyathophyllum Jfwc7mom"-group. 

 Mutational stages: — 



(a) Cyathophyllum <f> : C (maximum at the top). 



(b) Cyathophyllum Murchisoni (s. s.) : rare in S 2 ; abundant in D ; 

 a maximum in D 1# 



(2) Cyathophyllum regium. D 2 (abundant). 



(3) Koninckophyllid Cyathophyllum. D ; maximum in D x . 



Campophyllum. 



Species-group : Campophyllum Murchisoni. D; maximum inD.. 



Clisiophyllids. 



Not uncommon in S 2 ; maximum in D. 

 (i) Clisiophyllum. (Carcinophyllum.) 



Species- group: Clisiophyllum 6. S 2 ; D 1 (maximum). 



(ii) Dibunophyllum. 



Specie?; -group : Dibunophyllum turbinatum. 

 Mutational stages : — 



(a) Dibunophyllum 6 and Bib. <p : S 2 (rare) ; D 1 (maximum). 



(b) Dibunophyllum \p : D x (?) ; D 2 (maximum). 



(iii) Cyclophyttum : D x (rare locally), 

 (iv) Koninckophyllum : D (common locally), 

 (v) Axophyllum : D 2 (common), 

 (vi) Lonsdalia. 



Species-group : Lonsdalia floriformis (including var. L. cf„ 

 rugosa). D 2 (very abundant). 



