APPENDIX. 345 



And the genera whose characters it has been found requi- 

 site to modify are : 



Catenicella Cauda 



Salicornaria Emma 



Cellularia Acamaichis 



Scrupocellaria Caberea. 

 Biceilaria 



Of the twenty-four genera, three, or perhaps four, 

 appear to be peculiar to the AustraUan seas. These are : 

 Calpidium Didymia 



Canda ? JJimetopia. 



All the rest, excepting two, Emma and Diachoris, appear 

 to be distributed over the globe in both hemispheres. The 

 above two are perhaps Umited to the southern. 



Of the fifty-three species, about thirty-three seem to be 

 new, or to have been so imperfectly described as not to 

 admit of precise identification, and five others have syno- 

 nyms more or less doubtful applied to them. 



Six species only are common to the seas of Europe, viz. : 



Tubulipora phalangeal Anguinaria spatulata 



Crisia denticulata Acamarchis neritina 



Eucratea chelata Retepora cellulosa. 



Sixteen others are met with in other parts of the Southern 

 hemisphere, viz. : 



Catenicella elegans? Catenicella cribraria 



. ventricosa cornuta 



Eschara lichenoides, oc- Celhdaria monotrypa 



curring in Algoa Bay ; Biceilaria tuba, in New 



Caberea Zelanica Zealand ; and 



Acamarchis trident ata, in Emma crystallina 



Algoa BayandNewZealand; tricellata, in New 



Caberea lata Zealand and Campbell's Is- 



Catenicella hastata land. 



Thus of the fifty-four species, about thirty-four would 



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