^ 



• PWTE 12. 



ig. 1. 90. 1. CoLtTMNARIA ALVEOLATA. • (P^g- 47.) 



1. A verticil soction of & compact spccimeti, ohowini; the striated walls of tlio cells. 

 I o. A vertical section, showinp the transverse ciissopinienls, with the vertical lamellx obliterated. 

 1 h. A transverse section (wcathere<i surface), showing the radiating lamellip. 1 c. The same enlarged. 



Fig. 2. 81. 1. Stkomatocekicm rugosum. (Pag. 48.) 



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



as large as this one. 

 i a. A fragment magnified, showing less contortion of the lamina;, with some indistinct indication of vertical 



tubes or cells. 

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



Fig. 3, 5. 82. 2. CH.fiTETK8 lycoperdon? (Pag. 48.) 



.3. Specimen natural size. 



r>. Probably the same species, very minute, occurring in some thin shaly layers at the upper part of the Bird- 

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



Fig. 4. 83. 2. Steeptelasma profunda. (Pag- 49.) 



4. Lateral view of a specimen where 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 lamellae at the centre : the section is 



slightly oblique. 

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



reach the centre. 

 ^^ A e. 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 <J. A longitudinal section, slightly oblicjue to the axis, and coming out on one side of the centre below ; 



showing some of the lamellx 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. 85. 4. Stictopora ramosa. (Pag. 51.) 



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



7. A small portion, showing the base of the cells when separated from the internal axis. 



7 a. The same magnified. 



^ Fig- 8. 84. 3. Stictopora labyrinthica. (Pag. 50.) 



>. The weathered surface of a fragment of the limestone, showing the transverse sections of this coral of the 

 natural size. 

 ** ■< a, b. Enlarged portions as seen upon the specimen above, showing sections of two rows of cells rising ob- 



liquely from the axis. 



Fig. 9. Fragment of a crinoidal column. {» (Pag. 51.) 



1. m 9-% I 



