THE CRAG POLYZOA. 



*** Cells side by side. 



31. DlDYMIA. 



2. RIGID.*:. Texture calcareous, rigid. Polyzoa immoveably fixed or wholly unattached ; adnate 

 and crustaceous, erect or massive. 



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

 (a) Series distant, repent. 



Fam. 11. HIPPOTHOID.%. 

 * Cells urceolate, decumbent. 



t Branches given off from the sides of a cell. 



32. HIPPOTHOA. 



ft Branches springing from the summit of a cell. 



33. ALYSIDOTA. 



** Cells tubular, erect. 

 34. 



(6) Series contiguous ; polyzoarium crustaceous, spreading. 



Fam. 12. MEMBRANIPORIDrfl. 

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



35. MEMBRANIPORA. 



** Cells urceolate, closed in front. 



36. LEPRALIA. 



B. ERECT*. Polyzoarium erect, or massive; cells decumbent and serial; or sub-erect and 

 confused. 



(a) Cells sub-erect and confusedly heaped. 



Fam. 13. CELLEPORID&. 



37. CELLEPORA. 

 (4) Cells decumbent serial, in one plane. 



a. Affixes. Immoveably fixed by a calcareous base. 



Fam. 14. ESCHARIDdE. 

 (a) Cells in a single plane. 

 * Two layers of cells. 

 t Series longitudinal. 



38. ESCHARA. 



ft Series transverse. 



39. MELICKRITA. 



