142 GUIDE TO THE FOSSIL INVERTEBEATE ANIMALS. 



G-allery 

 VIII. 



Wall-cases 

 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. 



this groove. The margin of the shell opening is folded in- 

 wards (Fig. 76 6). A few specimens of Cambrian age are 

 shown. The largest are Ordovician, those from the Gres de 

 May 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-Carboniferous rocks of E"ew 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 Wall- 

 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 I^orth American specimens is Megalomiis, which 

 forms thick banks in the Guelph Limestone. Devonian 

 fossils, mostly from Germany, follow on the same slope. 

 The irregularly-shaped Platyceras [Acromlia] Frotei 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. These are succeeded by a series 

 from the Permo-Carboniferous rocks of Tasmania and New 

 South Wales, many described in Strzlecki's book on the 

 latter colony (1845). 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 the 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 Malacological 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 represented ; 

 among the gastropods is also a set of Lithotroclms Humholdti 

 from Peru. Wall-case 7 contains the shells of Oolitic 

 (Aalenian to Portlandian) age. At the end are placed 

 three interesting series recently described : from Singapore 

 (Geological Magazine, 1906) ; from Borneo (Proceedings of 

 the Malacological Society, 1903); and from Madagascar 

 (Quart. Journ. Geological Society, 1889 and 1895). On 

 the bottom slope is a fine series from the Bajocian and 

 Bathonian rocks of ^^ormandy agreeing closely with that 

 from British localities of corresponding age; the large 



