PLATE IV. 
Page. 
Fig. 1. Jlichelinia, sp. ind. ( 1 M. tenuisepta, Pliillips). Polished surface of a small 
example, cut rather obliquely, showing pores and vesicular tabula;, x. 2. 
Carrol, near Somerton ... ... ... ... ... ... ... ... 2S 
Fig. 2. crinfto, Lonsdale. Portion of a highly lobate example. Singleton ... 49 
Fig. 3. Sleno 2 )ora tasmnniensis, Lonsdale. Part of a small corallum, showing calices .and 
acanthopores, x. IL Harper’s Hill ... ... ... ... ... ... 60 
Fig. 4. A small part of the surface of Fig. 3, showing the oval form and (juincuncial 
arrangement of the calices, and great development of acanthoi^orcs, x. 8. 
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