38 



Plate IV 



All figures are X 30 except Fig. 1 , which is X 60. 



Page 



Fig. 1. Homotrypella hospitalis peculiar is. Tangential section 25 



Fig. 2. Monticulipora parasitica multipora. Tangential section 27 



Fig. 3. Monotrypella curvata. Tangential section 26 



Fig. 4. Monotrypella curvata. Vertical section 26 



Fig. 5. Rhombotrypa quadrata. Tangential section 10 



Fig. 6. Stigmatella crenulata. Tangential section 10 



Fig. 7. Stigmatella hybrida. Tangential section 27 



Fig. 8. Stigmatella hybrida. Vertical section 27 



