PLATE XVITI. 



SiDERASTBRA, STEPIIANOMORPHA, MESOMORPHA, BALANOPHYLLIA. 



Figs. 1 to 4. Siderasirea hejaijunalis sp. uov 155 



Fig, 1, profili! view of eorallum, X {' ; fig. 2, i-oralluin, viewed from above, natural 

 size; fig. 3, several caliccs, X 3J^, detail not precisely correct; fig. 4, portion of 

 wall and some septa, X 8|, drawn very carefully, to show character of wall and 

 di.stribution of synapticuhe. All figures from the same specimen. 

 Figs. 5 to 7. Slephanomorpha monticnliformis gen. et sp. uov 156 



Fig. 5, general view of eorallum from side, X % ; fig. 5a, several calices, x 3J ; fig. 6, 

 view of a intercorallite area (same specimen), X 5, to show synapticulaj between 

 costiK ; fig. 7, longitudinal section, X 6, to show synapticulse between costa;. 

 Figs. 8 to 10. Mesomorpha dnncani sp. nov 159 



Fig. ,s, profile view of eorallum, Xfj Ag- 8a, view of eorallum from above, natural 

 size; tig. 8b, several calices, X 2i, shows confluent septo-cost;e ; fig. 8c, one calice, 

 X 5, very carefully drawn to show distribution of synapticuhe; fig. 9, general 

 view of another specimen, natural size; tig. 10, flat surface of two septa, X 6, the 

 cross marks the delimitation between adjacent calices. This figure shows the 

 iuiperfiirato character of the septa and the lirokcn ends of thesynaptieirLe. From 

 the arrangement of the latter, the trabecular constitution can lie inferred. The 

 trabecuhe. at the line of fusion between adjacent calices are vertical, but toward 

 the inner terminations of the septa they have a slight, though not great, inclina- 

 tion inward. 

 Figs. 11 to 13a. lialanophylUa desmopliiillum ilihio-Ed\\an\>i and Haime 164 



Figs. 11 and 12, upright views of two specimens, natural size; fig. 12a, costse 

 enlarged; fig. 12b^ portion of calice to show septal arrangement, X3; fig. 13, 

 upright view of specimen, X2i; fig. 13a, transverse outline, X J. 

 Figs. 1, 3, r>, 5a, 8, 8b, and 13 drawn by ,1. Henry Blake; all othei's by Dr. .T. C. McConnell. 



244 



