Hi THE CRAG POLYZOA. 



*** Cells side by side. 



31. DlDYMIA. 



^§ 2. RiGiD.E. Texture calcareous, rigid. Polyzoa imraoveably fixed or wholly unattached ; adnata 

 and crustaceous, erect or massive. 



A. Adnat.e. Polyzoarium wholly adnate. Cells serial, series contiguous or distant 

 (a) Series distant, repent. 



Fam. 11. HIPPOTHOID.E. 



* Cells urceolate, decumbent. 



t Branches given off from the sides of a cell. 



32. HiPPOTHOA. 



ff Branches springing from the summit of a cell. 



33. Alysidota. 



** Cells tubular, erect. 



34. ^TEA. 



{i) Series contiguous ; polyzoarium crustaceous, spreading. 



Fam. 12. MEMBRANIPORIB^. 



f Cells depressed, or open in front, with a raised margin. 



35. Membranipora. 



** Cells urceolate, closed in front. 



36. Lepralia. 



B. ErecT-E. Polyzoarium erect, or massive; cells decumbent and serial; or sub-erect and 

 confused. 



(a) Cells sub-erect and confusedly heaped. 



Fam. 13. CELLEPORIDJE. 



37. Cellepora. 



(b) Cells decumbent serial, in one plane. 



a. AffixcE. Immoveably fixed by a calcareous base. 



Fam. 14. ESCEARID2E. 

 (a) Cells in a single plane. 

 * Two layers of cells, 

 f Series longitudinal. 



38. Eschara. 



ft Series transverse. 



39. Melicerita. 



