LIST OF ILLUSTRATIONS. IX 



Fig. 29. Anolotichia rhombica. a, tangential section, X 20; h, another tan- 

 gential section, X 20; c, vertical section, X 20; cZ and e, two por- 

 tions of a vertical section 92 



30. Anolotichia brevipora. a, vertical section, X 20, exhibiting short, 



immature, and mature regions; h, tangential section, X 20, with 

 tubules in lunaria; c, portion of same, X 35 94 



31. Anolotichia revalensis. a, vertical section, X 9; b, portion of the 



same, X 20; c, a normal tangential section, X 20 96 



32. Anolotichia impolita. a and 6, sm-face of a well-preserved example, 



X 9, and X 18; c, small portion of a tangential section, X 18, 

 showing lunaria and tubuli; d, vertical section, X 9 (after Ulrich) . 97 



33. Anolotichia impolita. a, fragment of zoarium, natm-al size; h and c, 



tangential and vertical sections, X 18 98 



34. Anolotichia sacculus. a, a type-specimen, natm-al size, with most of 



the zoarium exfoliated and showing the impression of the epitheca; 

 6, vertical section, X 20; c, tangential section, X 20; d, another 

 tangential section, X 20; e, two lunaria, X 35, exhibiting num- 

 ber and distribution of tubuli : 99 



35. Favositella interpuncta. a, vertical section, X 20; &, tangential sec- 



tion, X 20, with structure of zooscia and mesopores 101 



36. Favositella exserta. a, edge view of a zoarium, natural size; 6, sur- 



face view, X 9, of the sectioned type; c, tangential section, X 20, 

 exhibiting the small prominent lunarium; d, vertical section, X 9, 

 through portions of two layers; e, portion of the same, X 20, illus- 

 trating wall structure in more detail 102 



37. Favositella discoidalis. a and h, top and side views of a zoarium, 



natural size; c, siu-face of same, X 9; d, tangential section, X 20; 

 e and/, vertical section, X 9, illustrating slight variation in struc- 

 ture 104 



38. Favositella? punctata, a, celluliferous side of a zoarium, X 2; 6, 



basal side of same specimen, X 2; c, tangential section, X 20; d, 

 vertical section, X 20 105 



39. Scenellopora socialis. a and 6, copy of Eichwald's views of Ceramo- 



pora socialis; a, zoarium, natural size, incrusting an Echinos- 

 pherites; 6, one of the groups of zooecia of the same, enlarged. . . . 108 



40. Fistulipora primseva. a, the type-specimen, natural size; 6, sur- 



face of same, X 8; c, tangential section, X 20; d, vertical section, 



X 8 ; e, portion of same section 110 



41. Chile trypa immatura. a, a fragment, X 2, with a few zooecial aper- 



tures enlarged; 6, tangential section, X 20, showing arrangement 

 and shape of zooecia; c, vertical section, X 20, with expanding 

 and contracting central tube; d, transverse section, X 20 Ill 



42. Ptilodictya flabellata. a, zoarium, natural size, parted along the 



mesial lamina; h, view enlarged, showing longitudinal arrange- 

 ment of zooecia 114 



43. Ptilodictya gladiola. Tangential section, X 20 115 



44. Escharopora subrecta. a and 6, a typical specimen, natural size, and 



the basal portion of the same, X 9; c, view of the central part of 

 the same zoarium, X 9; J and e, two specimens, natm'al size, 

 broader than usual; /, surface of the lower part of another example, 

 X 18, showing unusual conditions; g, tangential section, X 18, 

 cutting the immature and mature parts of the zoarium; h, portion 

 of a vertical section, X 18 117 



