PLATE 4. 



Figs. 34-37. Cells isolated by maceration. 



Fig. 34. Gland cell of endoderm. 



Figs. 35, 36. Supporting cells of endoderm. 



Fig. 37. Mucus cell of stomodaeum. 



Fig. 38. Muscle cells of mesentery. 



Fig. 39. Supporting cell of stomodaeum. 



Fig. 40. Granular gland cell of stomodaeum. 



Figs. 41, 42. Axis epithelium, with desmocytes. 



Fig. 43. Large kind of nematocyst cell, partly exploded. 



Fig. 44. Large kind of nematocyst cell, unexploded. 



Figs. 45, 46. Large kind of nematocyst cell exploded. 



Fig. 47. Small kind of nematocyst cell. 



Figs. 48-5 L Interstitial cells containing ovoid bodies. 



Fig. 52. Desmocyte enveloped in horny matter. 



Fig. 53. Face view of the striated ends of six desmocytes. 



Fig. 54. Secreting cells of axis epithelium. 



Fig. 55. Longitudinal section of endoderm of polyp wall in the region of 

 the column. 



Fig. 56. Longitudinal section of endoderm of a poljqa chamber. 



Fig. 57. Longitudinal section of the axial skeleton, near the tip of a branch. 



Fig. 58. Section of a portion of axis with its axis epithelium and desmo- 

 cytes. 



Fig. 59. Longitudinal section through the endoderm of a longitudinal 

 canal. 



Fig. 60. EpitheUum of axial skeleton, with desmocytes. 



Fig. 61. Diagram of a longitudinal section of the axial skeleton to show the 

 nature of the skeleton in the region of a branch. 



Fig. 62, 63. Cross sections of two dorsal mesenterial filaments. 



Fig. 64. Cross section of a ventral mesenterial filament. 



