CALCAREOUS SKELETON OF THE ANTHOZOA. 547 



Fig. 41. — Portion of a transverse sectiou through the hard aud soft 

 parts of Madrepora subulata, showing sc. The scale-like emergences of 

 bundles of fibro-crystals on the free surface of the coralium. b. The bundles 

 of fibro-crystals as seen in section, lying parallel to one another and 

 emerging at the free surface to form the " scales." Csp. is a costal spine. 

 ca. Calicoblasts. m^. Mesoglcea. en. Endoderm. 



Fig. 42. — Portion of a sectiou through a radial cceuenchynial canal of the 

 same species, showing a desmocyte, dc. ; calicoblast, ca. ; and endoderm, en. 



Fig. 43. — A transverse section through a costal spine and the adjacent 

 soft tissues of Madrepora rosacea. Sp. Costal spine. Crys. Deposit of 

 crystalline flbres on its growing point, m. I. Limiting men)braue. ca. 

 Calicoblasts. en. Endoderm. mg. Mesoglcea. 



