part 1] JURASSIC CHHONOIOGl" : LIAS. 71 



(d) Consideration of Table I. 



The lower line in Table I should indicate the depth of the 

 exposure, and the upper line not necessarily the tops of the various 

 cuttings, for there are superficial deposits in certain cases, hut the 

 top of the exposed Lias in them. By horizontal lines are indicated 

 what are lacunae supposed to be due to stratal failure, and by 

 vertical lines what may be clue to some other causes like collection 

 or nomenclature failure. 



If we take the Table in descending order, the first point to notice 

 is the absence of a JBecmiceras fauna (Hwiccian 3), for this fauna 

 occurs only a short distance away to the south, Hewlett's Hill, and 

 the Glenfall, near Cheltenham, 1 and is widely distributed over the 

 Continent. 



Two species of Acantliopleuroceras (A. solare and A. qua- 

 dratum) are recorded from a locality distinct from those which 

 yielded the other AcantJiopleurocerata. They are of the type 

 which I recorded with a query in my former paper (p. 264) for 

 Leckhampton and Hucclecote on the level of Hwiccian 2, to cor- 

 respond with Dr. Lang's records of Dorset strata. Mr. Richardson 

 records them at Didbrook with Liparoceras clielt\i\ense : I have 

 entered them in the table as being above it ; but definite proof of 

 this is lacking. Whether placed in the table above L. cheltiense, 

 or below it, they produce a gap in the records. As this gap is 

 continuous along a line of country, it looks as if stratal failure were 

 the explanation. 



The important j>oint is that these species were found separate 

 from the other Aca ntliopleurocerata : the evidence is so far in 

 favour of the surmise made in my paper — that stout Acantho- 

 pleurocerata occupy a different horizon from that of the valdani- 

 like forms. 



The record of Vptonia bronni and no record of TJ. jamesoni 2 

 greatly strengthens the surmise made in my paper (p. 267) that 

 there is faunal repetition of Vptonia — that there are two waves 

 of TJptonia which do not occupy the same horizon : especially 

 as Mr. Richardson says that TJ. bronni was abundant, and that 

 he had found it at other Gloucestershire localities. 3 



Mr. Richardson records a considerable brachiopod fauna : 

 Gincta many spp., Rliynclionella tlialia D'Orbigny, Rli. \_rostel- 

 lata (Quenstedt)], which is usually taken to indicate the jamesoni 

 zone : and therefore their position is now inferred to be in the 

 -pre-broiini beds. 



It will be interesting to consider these brachiopod records in 

 detail. For Gincta (Terebratula numismalis auctt.) is a genus 

 of Avide range : it occurs at Radstock (Somerset) and in Normandy 

 — in both places are fine specimens : there are fair-sized specimens 



1 The following- species of Beaniceras from near Cheltenham have been 

 fignred (11,4, II, 9): — B. eentaurus, pi. cxlvi, costatum, pi. cxxiii, crassum, 

 pi. cxlvii, rotvudum, pi. cxxix, senile, pi. cxxvi ; so it is quite a noticeable fauna. 



2 XVIII, 1, p. 139. 3 Ibid. p. 148. 



