52 Guide to the Invertelrata. 



6ALLEB7 Attention is also called to the series of Mollusca from the Trias 



VIII 

 WestSide. ^^ ^^' ^^ssian (collected by Klipstein), of which Myophoria is 



Wall-cases ^ prominent genus, related to Trigonia in some of its characters. 



8&9. The Permian shells are chiefly from Gera, Germany, and include 

 Schizodus, Pleurophorus, Pleurotomaria, Chitonellus, etc. The 

 Permo-Carboniferous series is represented by specimens from 

 Australia of the genera Platyschisma, Pachydomus, Mirydesma, 

 Orihonota, Conocardium, etc. ; several of these are types figured in 

 Strzelecki's Memoir, 1845. The Carboniferous of Belgium is 

 represented by the genera PJuomphalus, Loxonema, Chiton, Cono- 

 cardium, Pinna, etc. ; the Devonian of Germany by Murchisonia , 

 a banded shell related to Pleurotomaria, and by Megalodon cucullatus. 

 The Silurian genera from Bohemia exhibited are Tulina, Capulus, 

 Polytremaria, Conocardium, etc., part of the Barrande Collection. 



There is a small table -case in the centre of the gallery, 

 placed near to Table - case 89, containing a series of foreign 

 Palaeozoic Gasteropods belonging to the families Bellerophontidjb, 

 Pleukotomariidje, and Solaeiid^. 



GALLEEY II.-ANNULOSA. 



vni. 



East Side. I.— BRACHIOPODA. 



Wall-cases 



10 & II, The Brachiopoda are animals that live in the sea, and have 

 Table- 

 cases ^ ^oft body enclosed in an external shell with two valves. 



They thus look something like bivalve Mollusca ; but both the 



Fig. 95. — Atrypa reticularis, Dalman. Silurian and Devonian. a, dorsal or 

 peduncular valve ; b, ventral or brachial valve. Shows bilateral symmetry, 

 and slightly greater size of dorsal valve. 



shell and the soft parts have really a very different structure from 

 those of the Mollusca. So much of the anatomy of the Brachiopoda 

 as is important to the student of fossils, is illustrated by the large 

 lO&lI. coloured diagrams in Wall-cases 10 and 11. 



The two valves of the shell lie on the back and front of the animal, 

 not on its sides as in bivalve molluscs. Each valve is symmetrical 



