SUPPLEMENT, PLATE XXXL 
CARBONIFEROUS, 
Specimens of which the spiral coils have been developed by the Rev, Norman Glass, 
of Manchester, See pages 270 — 4. 
Fig. 
1. Spirifera striata, M.2LYim. Carboniferous Limestone, Ardclough, Ireland. (P. 274.) 
2. „ „ Carboniferous Limestone, Craven District, Yorkshire. 
3. „ pinguis, var, rotundata, Sow. The spirals are exposed from four aspects. 
3. The dorsal. 3 a. The ventral. 3 h. The frontal. 3 c. The 
lateral. Carboniferous Limestone, Kildare, Ireland. (P. 274.) 
