26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I4O 



Plate 4 



Anaphragma mirabile Ulrich and Bassler 



Fig. la. Longitudinal section of topotype, U.S.N.M. 138277, X 50, showing 

 moderately thick-walled zooecia that developed broad zones of curved 

 laminae. Note center channel of acanthopore in lower left corner of 

 figure. U.S.N.M. collection 2996. 



Fig. lb. Longitudinal view from same section, X 5o, showing strongly V-shaped 

 laminae and well-defined zooecial boundary in exozone. Note center 

 channels of acanthopores in two zooecial walls at bottom of figure. 



Fig. 2. Tangential section of topotype, U.S.N.M. 138278, X 50, illustrating 

 appearance of advanced growth stages in a thick-walled zoarium. 

 Note the very large acanthopores irregularly inflecting zooecia and 

 mesopores, and the broadly amalgamate appearance of the walls. 

 U.S.N.M. collection 2996. 



Fig. 3a. Deep tangential section of topotype, U.S.N.M. 138279, X 50, illustrating 

 an intermediate growth stage in a thin-walled zoarium. Note the 

 inflection of zooecial walls by the acanthopores and the enlarged 

 zooecium and acanthopore in the monticule in lower right of figure. 

 U.S.N.M. collection 2996. 



Fig. 3b. Longitudinal section of same zoarium, X So, showing variation in 

 zooecial wall thicknesses and generally U-shaped wall laminae of 

 intermediate and possibly advanced growth stages. 



Fig. 4. Tangential section of topotype, U.S.N.M. 138280, X 50, illustrating 

 young growth stage in a thin-walled zoarium. Note integrate appear- 

 ance and small acanthopores. U.S.N.M. collection 2996. 



Plate 5 



Amplexopora septosa (Ulrich) 



Fig. I. Transverse view of paratype, U.S.N.M. 138282, X 10, showing trans- 

 verse shape of zooecial tubes in endozone. Note slight outward dis- 

 placement of exozone in monticule at extreme left of figure, relative 

 to intermonticular exozone in remainder of view. 



Fig. 2a. Tangential view of lectotype, LT.S.N.M. 138281, X 30, showing a mon- 

 ticule with a cluster of mesopores and apparently very few offset 

 acanthopores, surrounded by an intermonticular area containing abun- 

 dant offset acanthopores. Because of the outward displacement of the 

 exozone in the monticule, the section passes proximal to the zone of 

 offset acanthopores in the monticule, but through the offset acantho- 

 pores in the intermonticular area. 



Fig. 2b. Tangential view of lectotype, X 50, showing amalgamate appearance 

 of zooecial walls and offset acanthopores generally concentrated be- 

 tween zooecial corners. 



Fig. 2c. Longitudinal view of lectotype, X 50, illustrating the origin of an offset 

 acanthopore and its spinelike appearance. The apparent distal ter- 

 mination of the acanthopore (distal direction to the riglit) can be 

 merely the passing of the acanthopore out of the plane of the section. 



Fig. 2d. Shallow tangential section of lectotype, X 20, showing mud-filled living 

 chambers of intermonticular zooecia cut distally to the zone of offset 



