﻿268 DR. A. VAUGHAN ON" THE PAL^EONTOLOGICAL [May I905, 



The Bristol forms which I include here have the following 

 characters : — 



The tubes are moderately spaced, and have a general parallel 

 trend, but are subramuiose at considerable intervals. 



Horizontal Section. — Moderately-spaced single rings and 

 dumbbell-like pairs are almost equally numerous : elongated inter- 

 sections are rare. 



Range. — Throughout the Visean. 



SyEINGOPOEA cf. GENICULATA, Phill. 



As interpreted in Edwards & Haime, ' Monogr. Brit. Foss. Cor.' pt. iii, 

 p. 163 & pi. xlvi, figs. 2-2 a. 



Tubes closely packed and parallel : connectors very numerous. 

 Horizontal Section. — Closely-placed rings, the majority of 

 which are connected. 



Range. — I only know the typical form from D x . 



SYEINGOPOEA Cf. EAMTJLOSA, Goldf. 



As interpreted in Edwards & Haime, ' Monogr. Brit. Foss. Cor.' pt. iii, 

 p. 161 & pi. xlvi, figs. 3-3 g. 



Tubes greatly spaced and strongly flexed ; the connectors are of 

 equal diameter with the tubes. The Bristol form has narrow 

 tubes. 



Horizontal Section. — The intersections are very sparsely 

 distributed, and elongated intersections are frequent. 



Range. — I only know this form with certainty from S. 



Syeingopoea 0. (PI. XXII, figs. 1 & 1 a.) (Cf. S. laxa, Phill.) 



Corallites cylindrical, and arranged in parallel grouping. Con- 

 necting-tubes distant. Geniculation scarcely noticeable at the 

 junctions of the corallites with the connecting-tubes. Tabulae 

 distant and funnel-shaped. 



In a horizontal section, only a few of the cross-sections are 

 connected, and there is seldom more than one oval tabular inter- 

 section, within the cross-section of a corallite. 



Diameter of corallites = 2 to 2 J millimetres. The distance between 

 the axes of adjacent corallites averages 4 mm. ; the distance apart of 

 connecting- tubes averages 10 mm. 



SYEINGOPOEA Cf. EETICTJLATA, Goldf. 



Tubes very narrow, parallel, and close-set. 



Horizontal Section. — The frequent grouping of four or five 

 tubes, in such a manner that their cross-sections form short chains, 

 produces a marked Ualysites-like appearance. 



Bange. — This form is highly characteristic of C r 



Cleistopora. 



Cleistopoea afT. geometeica (Edwards & Haime). 



As interpreted in Vaughan, Proc. Bristol Nat. Soc. n. s. vol. x (1903) pp. 99- 

 100 & pi. i, fig. 3. 



