PL^TE VI 



Page. 

 Fig. 1. LiTHOSTKOTION Whitneyi 58 



1. A view of a mass of limestone including several of .the corallites, natural size. 

 1 a. Another view of same, showing the ends and calices of the corallites. 



1 &. A transverse section of one of the same, somewhat enlarged. 



1 c. A longitudinal section of same. 



Fig. 2. Syiungopoka (uudt. sp.) 50 



2. A side view of a fragment of the corallum. 



2 a. Another view of same specimen, showing the ends of the corallites. 



Fig. 3. Zaphhentis Stansburyi 54 



3. A side view of an imperfect specimen, with the edges of the calice and the lower 



extremity broken away. 



3 a. An upper view of same, showing the septa, with the rtnuviuing portion of the calice 



filled with rock. 

 3 6. A transverse section of the corallum below the middle. 



3 c. A longitudinal section of the upper part of the same, showing the complex tabulae 



and outer vesicular zone, the form of the broad bottom of the calice, etc. 



Fig. 4. Zapiikentis? (Clisiophyllum?) multilamellosa 53 



4. A dorsal view of a specimen denuded of its epitheca, and showing the divaricating 



arrangement of the septa. 



4 a. A view of the calice of same, with its margins broken away and its bottom filled 



with rock. 

 4 6. A longitudinal broken section of same, showing imiierfectly the internal structure, 

 with the fossula on the right. 



