Case 37. 
Case 38. 
28 
The various forms of the Murchisonia-ty pe (turreted 
shells with a slit-band) are well seen here, as 
Coelocaulus, Gyrodoma, and Cyrtostropha. 
Other forms are the large, flat, spiral gasteropods, 
Euomphalus, like the living Planorbis in shape, 
though unrelated ; and the top-shaped shell, 
Scalaetrochus. Pteropods are seen m Styliola, 
a minute “ sea-butterfly ”, also Tentaculites, 
Hyolithes (with a closing lid or operculum) and 
Contjlaria (having a fine surface ornament). 
B. 
Fig. 31. A.B. A Murchisonia- like Snail — Coelocaulus brazieri 
(Etheridge fil). 
From the Silurian of Lilydale. 
A. Broken whorls, with infilled Columella. 
B. Section of Shell. 
The Cephalopods of the straight Nautilus type (orthocera- 
cones) are well represented. Some shown here attain 
a length of eight inches. The Chinese call them 
“ pagoda-stones,” as they resemble in outline their 
tall, tapering temples. 
