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small dimensions, still presenting in the Fish Bed concretions 
the minute fossils usually found in them, and conspicuously, in 
great abundance, the young shells of the gastropod before men- 
tioned, Euomphalus minutus (Sow.) In the coarse foxy Marl- 
stone of the Amaltheus Spinatus division the contents are fairly 
representative, and first we cite the ammonite often found at 
Gretton, the Phylloceras Zetes (d’Orb.) Our specimen from the 
sandstone of this quarry is five inches in diameter, and is a 
shell that some paleontologists have confounded with the 
Phylloceras heterophyllum (Sowerby). We transcribe from a 
note made many years ago the following :—“ Quenstedt (Der 
Jura, I., p. 172): A. heterophyllus. Wen. d@’Orbigny zu trauen 
wire (Prod. I. page 246, &.)” Prof. Quenstedt is altogether 
wrong, and Alcide d’Orbigny right about A. Zétes. I have 
compared true A. heterophyllus, from Whitby, with the A. Zétes 
of d’Orbigny, fine specimens of which have been yielded by the 
Middle Lias of Gretton, near Winchcomb, and the differences 
between the two shells are distinct and specific:—1. In the 
sutures. 2. In the umbilicus. The management of the points 
at issue is cleared up in a succinct and masterly way in the 
monograph of our late friend, Dr Wright, after whom we may 
write cadit questio, so far as this subject is concerned. See 
pages 422 and 424 of the Monograph of the Lias Ammonites of 
the British Islands, and carefully examine the excellent plates 
of the respective species. Paleontographical Society, 1883. 
Amongst other fossils gathered on this occasion from the 
Amaltheus spinatus beds we note: Phylloceras Zétes (d’Orbigny), 
Amaltheus spinatus (Brug), Arcomya longa (Buvignier), Pleu- 
romya granata (Simpson), Pecten lunaris (Roemer), Gervillia 
cerosa (Quenstedt), Rhynchonella tetrahedra (Sow), Pleuro- 
tomaria rotellaformis (Dunker), Gryphea cymbium, var. depressa 
(junior), and Myoconcha decorata (Munster); also many common 
characteristic forms of the spinatus beds. We must not omit 
the number of smaller crustacea, Ostracods, that appear in this 
part of the Middle Lias at Gretton, and also at Ashton-under- 
Hill; Cytherea and Cytherina, genera which also occur on the 
same horizon of the Middle Lias in Germany, at Liebenburg, 
and Salzgitter. 
yy Tew artes 
