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nidae, Mijriozoidde, Escliarella, Escharuide.s, Pori'lla, Omjchocclhi and Calloporti. On 

 the other hand, the rosette-plates show variations in the families Fhislridae, 

 Membraniporidae, Cribriliiiidae and Micioporidae, l)ut in slill higher degree in the 

 genera Schizoporella and Sniittiiia. hi these some species have single-pored, others 

 multiporous, and again others mixed rosette-jilates, and colonies from different 

 localities may show a distinct difference in the number of pores in the rosette- 

 plates e. g. in Schizop. unicornis, Sch. sanguinea and Sch. longirostris. 



