PLATE 18. 



Fig. 30. — T. rozieri. A few zocecia in the adult condition without blunt 

 processes and showing a large spatulate avicularium (sp.av.). X 30. 



Fig. 31. — CribriUna hippocrepis Hincks. A few adult zocecia showing 

 arrangement of the perforated furrows, the ooecia (oe.), and a large avicu- 

 larium («(•.). X 30. 



Fig. 32. — Microporella californica Busk. Habit sketch. 



Fig. 33. — M. californica. A few zocecia showing spines, avicularia, pore 

 (p.), and ooecia. X 30. 



Fig. 34. — M. californica. Porous plate which fills in the pore. X 70. 



Fig. 35. — Microporella malusi Audouin. A few zoircia showing lunate 

 pore (p.), and ooecia (oe.). X 30. 



Fig. 36. — M. malusi. Primarj' zooecium showing niend>ranous primary 

 aperture surrounded with spines. X 30. 



Fig. 37. — Lagenipora spinulosa Hincks. A few zocecia showing tubular 

 prolongation (t.pro.), spines, ooecium (oe.), and elevated avicularia (ar.). 

 X 30. 



Fig. 38. — Scfiizoporella areolata Busk. A few zoa^cia showing adult con- 

 dition. X 30. 



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