PLATE 23. 



Fig. 72. — Smittia collifera sp. nov. A few zocecia near the growiug rim 

 showing spines, blunt processes {bl. pro.) and avicularia (av.). X 30. 



Fig. 73. — S. collifera. Two adult zocecia showing increase in nvimber of 

 blunt processes, and an ooccium (ce.) ornamented with the same sort of cal- 

 careous processes. X 30. 



Fig. 74. — Smittia landsborovi Johnston. A few adult zocecia showing 

 porous front wall, rounded avicularium (av.), and small ocecia («.). X 30. 



Fig. 7.5. — Smittia reticulata Macgillivray. A few adult zocecia showing 

 strongly areolated margin, and large ocecia (oe.). X 30. 



Fig. 76. — S. reticulata. A young zoa^cium at the growing edge. X 30. 



Fig. 77. — Phylactella collaris Norman. A few adult zocecia showing per- 

 istome (per.) and the frontal process (pro.) that sometimes forms on it. 

 X 30. 



Fig. 78. — Mucronella pavonclla Alder. A few adult zocecia showing 

 large orifice with mucro (inn.) on its lower margin. X 30. 



Fig. 79. — M. pavonella. A young zocecium at the grooving edge showing 

 orifice (or.) before mucro has formed. X 30. 



Fig. 80. — Mticronella califorvica sp. nov. A few zocecia showing spat- 

 ulate avicularia (sp. av.) and other avicularia over the surface. X 30. 



