PLATE 12. 



Fijr. 1. SO. 1. CoLTrMNABIA ALVEOLATA. (Pag. 47.) 



1. A vertical section of a compact specimen, showing the striated walls ol' the cells. 



1 a. A vertical section, showing the transverse dissepinieiils, with the vertical lamellae obliterated. 



1 h. A transverse section (weathered surface), showing the radiating lamellre-. 1 c. The same enlarged. 



Fio-. 2. 81. 1. Stromatocerium rugosum. (Pag- 48.) 



2. A specimen, natural size, showing the concentric lamination of the coral. The masses arc often several times 



as large as this one. 

 ■2 a. A fragment magnified, showing less contortion of the lamina:', with some indistinct indication of vertical 

 tubes or cells. 



2 i. A small portion of a specimen of the natural size, showing the rugose or contorted direction of the lamince 



Fig. 3, 5. 82. 2. Ch^etetes lvcoperdon? (Pag. 48.) 



.3. specimen natural size. 



.•i. Probably the same species, very minute, occurring in some thin shaly layers at the upper part of the Eird- 

 seye limestone, or at its junction with the Black-river limestone. 



Fig. 4. 83. 2. Streptelasma profunda. (Pag. 49.) 



4. Lateral view of a specimen wliere the edge of the cup is worn down, shortening the entire length about 



one-third. 

 4 a. Section of a specimen near the base, showing the contortion of the lamellse at the centre : the section is 



slightly oblique. 

 4 ft. Transverse section above the base, showing the alternation of larger and smaller lamellae, which do not 



reach the centre. 

 4 c. Transverse section near the termination of the cup. I have some doubt whether this section is of the 



same species, the lamellae being much stronger and less in number than in the other individuals, which 



all occur in one specimen of the stone. 

 4 d. A longitudinal section, slightly obliijue to the axis, and coming out on one side of the centre below ; 



showing some of the lamella; vertically, and others obliquely. 

 4 e. An oblique section, being nearly transverse to the lower part of the fossil on one side. 



Fig. 6, 7. S5. 4. Stictopora ramosa. (Pag. 51.) 



li. A small fragment of limestone, the surface covered with pieces of the coral. 



7. A small portion, showing the base ol the cells when separated from the internal axi.s. 



1 a, Tlie same magnified. 



Fig. 8. 84. 3. Sttctopora labyrinthica. (Pag. 50.) 



N. Tlic weathered surface of a fragment "f the limestone, showing (lie transverse sections of this coral of the 



natural size, 

 s rt, 1). Enlarged portions as .seen upon the .-ipecirneii almve, showing sections of two rows of cells rising oh- 



licjuely from the axis 



Fig. 9. Frngment of a rrinoidal column. (Pig. 51.) 



