14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 39 



EXPLANATION OF PLATES 



Plate i 



Figs. 1-4. Trematopora tuberculosa Hall. 



1. Longitudinal view of paratype, A.M.N.H. 1747, X 5. showing primary 

 branch with growth direction upward and branch from secondary 

 overgrowth with growth direction to lower right. 



2a. External view of lectotype zoarium, A.M.N.H. 1747, X 2 , showing tuber- 

 culated monticules. 



2b. Longitudinal view of lectotype, X 20, showing beaded mesopore cham- 

 bers in inner region of exozone. 



2c. Tangential view of lectotype, X 20, showing aspect of both inner and 

 outer regions of exozone. Note thin-walled polygonal tubes of inner 

 region of monticule in upper left. 



3. Tangential view of paratype, A.M.N.H. 1747, X 50, showing the smaller 



central pores in mesopore diaphragms of outer region of exozone. 



4. Longitudinal view of topotype, U.S.N.M. 137847, X 5. showing zooecial 



growth at surface of contact of anastomosing branches. U.S.N.M. 

 collection 2998. 



Plate 2 



Figs. 1-3. Trematopora tuberculosa Hall. 



1. Longitudinal view of topotype, U.S.N.M. 137848, X 100, showing lam- 

 inated structure of a beaded mesopore and two diaphragm pores in 

 the inner region of the exozone. 



2a. Longitudinal view of topotype, U.S.N.M. 137849, X I oo, showing con- 

 figuration of laminae of mesopores and small diaphragm pore in outer 

 region of exozone. 



2b. Longitudinal view of same specimen, X I00 » displaying a mesopore with 

 diaphragm pore of inner region covered by first diaphragm laminae of 

 outer region. Note discontinuous and ragged boundary between 

 mesopore wall and zooecial wall above. 



3a. Longitudinal view of topotype, U.S.N.M. 137850, X 100, showing first 

 a diaphragm pore and then a compound diaphragm between beaded 

 chambers in the inner region of the mesopore. 



3b. Longitudinal view from same zoarium, X 100, illustrating the structure 

 of the wall of adjacent zooecia. 



3c. Tangential view from same zoarium, X I oo, showing the general aspect 

 of the outer region of the exozone, including acanthopores, mural 

 spines, and a small pore in the center of a diaphragm of a mesopore. 

 The dark intermediately sized spots are the randomly arranged cavi- 

 ties noted in species description. 



