PLATE 40 D. 



Fig. 1. 558. 3. Fenestella elegans. (Pag. 164.) 



1 a. A poi-tion of a frond, showing the non-celluliforous side. 



1 i. A portion enlarged, showing the form of fenestrule, striated surface of branches, etc. 



1 c. The impressions of tlie cellulifcrous side in the sliale. 



1 d. A fragment sliowing the cellulifcrous side of the coral. 



1 e. The s;ime enlarged, sliowing tlic form and arrangement of the cells. 



1 /. Another specimen of the cellulifcrous side. 



1 g. The same enlarged, showing the form and appearance of the ci-lls ,<here tlu' surface is somewhat worn. 



Fig. 2. 559. 4. Fenestella tenuiceps. ( Pag. 165.) 



2 a. The exterior surface of a large cyathiform froud which has been crushed. 



2 6. A portion of the last enlarged, .showing the cells where the edges of the branches are worn. 



2 6 t. A still farther enlargement of 2 6. 



2 c. An enlarged view, looking into tlie cells from a direction oblique to the surface of the frond. 



2 d, e. Lateral and basal view of a fragment of the cup broken ofl' just above the root. 



2 /. A specimen showing a fragment of the nou-poriferous face of Polypora inccpta and of Fencslclla 



tenuiceps. 

 2 g-. A portion of the latter enlarged, showing the form of fenestrules and the granular worn sjirface. 

 2 ft. A portion of another fragment enlarged, showing the striated surface of the branches. 



Fig. 3. 560. 5. Fenestella cribrosa. (Pag. 166.) 



1 a. A fragment natural size. 3 6. A portion of the same magnified. 



Fig. 4. 561. 6. Fenestella . (Pag. 166.) 



Fig. 5. 562. 1. Polypora incepta. ( Pag. 167.) 



5 a. The inner surface of a part of a large frond. 



5 6. A portion of the same enlarged, showing the striated surface of the branches and the transverse bars. 



5 c. A cup-form specimen, showing the inner or non-celluliferous surface. 



5 d. The cellulifcrous face enlarged. 



6 c. The non-celluliferous face enlarged. 



5 /. Several branches from the cellulifcrous face greatly enlarged, showing the bifurcation of the branches, 

 and the increasing rows of jiores from the point of bifurcation upwards. 



