142 GUIDE TO THE FOSSIL INVERTEBEATE ANIMALS. 
Gallery 
VIII. 
Wall-eases 
8 & 9, 
Wall-case 
9c. 
Wall-case 
9. 
Wall-case 
8 . 
Wall-cases 
9 5. 
Wall-case 
9, top slope. 
Wall-case 
8 . 
Wall-case 
7. 
ornamented with parallel ridges, which slope upwards toward 
this gi-oovo. The margin of the shell opening is folded in- 
wards (Fig. 7GZ)). A few specimens of Cambrian age are 
shown. The largest are Ordovician, those from the Gres de 
iMay in Calvados being noteworthy. Several species occur 
in Silurian rocks, and there will be noticed some specimens 
well preserved in nodules from the British Coal Measures. 
Some from the Permo-Cai’boniferous rocks of New South 
Wales are exhibited. A single species is also found in the 
Trias and in the Lias. 
We return now up the side of the Gallery, taking the AVall- 
cases with shells from foreign localities in reverse order. 
Palaeozoic. On the bottom slope of Case 9 are fossils 
of Cambrian, Ordovician, and Silurian age, mainly con- 
sisting of the Barrande Collection from Bohemia. Among 
the few North American specimens is Mcxjalomns, which 
forms thick banks in the Guelidi Limestone. Devonian 
fossils, mostly from Germany, follow on the same slope. 
The irregularly-shaped riatyceras [Acrocului\ Protci from 
Mayenne is worth notice. The middle slope contains the 
Carboniferous shells, among which those of the De Koninck 
Collection from Belgium are the most numerous. Here the 
Chiton claims attention. Tliese are succeeded by a series 
from the rermo-Carboniferous rocks of Tasmania and New 
South Wales, many described in Strzlecki’s book on the 
latter colony (184;")). Then come Permian fossils from the 
Zechstein of Saxony, with a few from Africa, among which 
is a specimen of a freshwater Lamellibranch collected by 
Henry Drummond on tlie N.W. shore of Lake Nyassa. 
Mesozoic. The Trias begins with a series of marine 
lamellibranchs from the Malay Peninsula, described in the 
Proceedings of the jHalacological Society (London, 1900); 
the next is the valuable collection from St. Cassian in the 
Tyrol, formed and described by A. v. Klipstein. The Lias 
of Germany and Northern France is fairly well rejiresented ; 
among the "gastropods is also a set of Liihotroclms IPimboldti 
from Peru. Wall-case 7 contains the shells of Oolitic 
(Aalcnian to Portlandian) age. At the end are placed 
three interesting series recently described : from Singapore 
(Geological Magazine, 190G) ; from Borneo (Proceedings of 
the Alalacological Society, 1903); and from Aladagascar 
(Quart. Journ. Geologicnl Society, 1889 and 1895). On 
the bottom slope is a hue series from the Bajocian and 
Bathonian rocks of Normandy agreeing closely with that 
