50 
Lamp-shells (Orthis and Rhynchotrema) ; Bivalved 
Molluscs (Nucula and Ambonychia) ; Marine 
Snails (Pleurotomaria and Holopaea) ; 
Cephalopods (Endoceras and Cycloceras) ; 
and Trilobites (including the handsome Harpes, 
Triarthrus in which air-breathing appendages 
were first found), and Dalmanites with its con- 
spicuously facetted eyes. 
Case 120. Contains some of the oldest fossils known, of Cambrian 
age. Amongst the more interesting of these are the 
supposed fossil Seaweed, Oldhamia, and the gigantic, 
spined Trilobite, Paradoxides. Hymenocaris 
vermicauda is a pod-shrimp allied to the living 
Nebalia, and which is also represented generically 
in Victorian rocks. 
Fig. 48. A Middle Cambrian Trilobite— 
Paradoxides davidis Salter. 
From South Wales. 
About one-third natural size. 
