PAGE. 



66 A tangential section of the same, enlarged to 5 diameters. 

 6c. Longitudinal section of the same, enlarged to 5 diameters and 

 showing the periodically contracted tubes, much as in Steno- 



125 



pora. 



ATACTOPORA SEPTOSA, . • . • • /, ,; T TJ 1 f „ QLHnnpr 



Fig 7. A specimen of the natural size, collected by Mr. J. Ealston Slvinner. 

 7a. Portion of the surface of same, enlarged to 8 diameters 

 7b. A small part of another specimen, enlarged to 8 diameters. This 

 figure shows the pseudo-septa as usually developed at the 



surface. . , ^.^ k 



7c. Longitudinal section showing internal characters. Magnified to & 



diameters. ^^26 



STELLIPORA LIMITARIS, XT '. i' • ' V O TTlrioh's 



Fig.. 8. A specimen with the usual characters. Natural size. E.O.LUrichs 



collection. 

 8a An enlargement to 8 diameters of a portion of the surface of same 

 showing depressed macula, the elevated calice margins, and 

 cellulose interstial spaces. , , n 



8b Longitudinal section taken from another example, enlarged to 5 

 ■ diameters. The figure represents only one half of the entire 



section of the branch. 

 8c. A tangential section. ^^^ 



CH^TETES GRANTJLIFEKTIS x^' xt ^ i ^o V 



Fig. 9. View of an example found at Frankfort, Ky. Natural size. E. 

 O. Ulrich's collection. 

 9a An enlargement to 8 diameters of a portion of the surface. This 

 figure is taken from a specimen, with comparatively few 

 spinular processes. 

 9b. A longitudinal section showing internal structure. 



CH^TETES IRREGULARIS, • • • ■■',.■ v O TTIriph's 



Fig. 10. A strongly nodulated specimen. Natural size. E. O. Ulrich s 



collection. 

 10a A portion of the surface magnified to 8 diameters. 

 106. A section cutting the tubes both longitudinally and transversely. 

 Enlarged to 5 diameters. 



CH^TETES SUBGLOBOSUS XT 1 • 



Fie 11 A representative specimen of this species. Natural size. 



lla A section cutting tubes transversely. Enlarged to 6 diameters. 

 116. Half of a longitudinal section. Enlarged to 2}4 diameters. 



Ch.s;tetes elegans ^ A tti • i> i 



Fig. 12. A nearly complete specimen. Natural size. E. O. Ulrich's col- 



lection. 

 12a. A i)ortion of the surface of same, enlarged to 8 diameters. 



EXPLANATION OF WOODCUTS ON PAGE 14. 



Fitrs 1 and 2 represent lateral and dorsal views of the best specimen found. In 

 freei^igthis specimen from its matrix, the frontal prolongation was unfortunately, 

 separated from the rest of the cephalic shield, and lost. Its position, however is sut- 

 ficiently indicated by the fracture. The snout has been observed (,n place on six 

 otTer, Uiough less perfect individuals, makin. it an easy matter to restore the same 

 on the specimen figured. 



Fig. 3. An outline view of the under side of the movable cheeks and snout, show- 

 ing the position and course of the frontal suture. 



129 



129 



130 



