724 PROF. REYNOLDS AND MR, VAUGHAN ON THE __[ Nov. 1902, 
recalls the ‘ Spirifer-Bank’ of Radstock, and in particular of Paulton; 
but the general differences between the two districts are very consider- 
able. Throughout the Lias of Radstock brachiopods are abundant, 
whereas, in the Sodbury cutting, the very reverse is noticeably the case. 
Lithologically also the two areas are strikingly dissimilar: in the 
Radstock area the zones are of no great thickness, and are chiefly 
limestones with subsidiary clays; in the Sodbury district the zones 
are of very considerable thickness, and are chiefly shales-with very 
subsidiary limestones. 
The complete list of fossils from this series is as follows :— 
Belemnites acutus, Mill. Ami. (Agassizoceras) Sauzeanus (?) 
Anmonites (Arnioceras) semicostatus, d’Orb. 
Y. & B., and its mutations. Gryphea arcuata, Lam. 
Amm. ( Arietites) Turneri, Sow. Pecten aff. textorius, Schloth. 
Amm. (Coroniceras) spp. Waldheimia (Zeilleria) indentata, Sow. 
Paleontological Notes. 
So many different ammonites have gone under the specific name 
of semicostatus, that it is necessary to indicate with some precision 
the particular form to which the name is here applied. ‘The ribs 
are straight, sharp, and close-set; their upper edges are horizontal 
and end abruptly in a vertical edge. The rim is square and 
provided with a sharp central keel, flanked by two deep furrows. 
The mutations are produced by the greater or less spacing of the 
ribs. These are the chief characters upon which we have had to rely 
for determining the solid whorl-fragments. The crushed specimens 
sometimes exhibit quite clearly the Arnioceratan character of smooth 
early whorls; but in most cases the centre is indistinct, and the only 
characters clearly defined are the straightness of the ribs and the 
slow rate of whorl-increase. In such eases, it is impossible definitely 
to identify even the genus. 
Arietites Turnert occurs in solid fragments of the typical Barrow 
form, but even in the crushed state it can be identified by the 
forward sweep of the ribs, as they approach the rim. 
The ammonites referred to in our list as Coroniceras spp. are solid 
fragments, kindly identified for us by Mr. 8. 8. Buckman, F.G.S. 
Agassizoceras Sauzeanum(?) is doubtfully so named from a 
fragment of awhorl. This exhibited a square cross-section; straight, 
well-spaced, strong ribs ending in prominent points ; and a flat rim, 
provided with a low, rib-like keel unflanked by furrows. Many of 
the crushed specimens probabiy belong to this form. 
Belemnites acutus is quite typical; short and almost perfectly 
conical, with a narrow apical angle. 
Pecten aff. textorius, Schloth.—In the right valve of this species, 
as figured by Goldfuss, the ribs resemble slender rods having rings 
set along them at intervals (after the 7. vimineus-pattern) ; but, in 
our specimen, the ribs are sharply angular and finely serrated. On 
the other hand, P. acutiradiatus, Miinst., with which our specimen 
has sometimes been identified, is more transverse and has its sharp 
angular ribs quite smooth. 
Waldheimia (Zeilleria) indentata is of the typical Radstock form. 
