PLATE yil. 

 Trochocyathus. 



Page. 

 Fig. 1. Crosssection of wall of Tro(7ioci/a;/iH.s /iy((//i sp. iiov., x 23. to show apparent pseudotheca. 93 



Figs. 2 to 9. Trochocyatlimt Iiiniilitiformis (Coiinul) 94 



Fig. 2, side vii-w of a typical specimen, X 3J; flg. 3, costal ends of septa, magnified; 

 fig. 4, side of septum, to show arrangement of granules, etc., X 8J^; figs. 5 to 8, 

 Tr. luniilitiformis var. montt/omcrknsis var. nov., p. 94; fig. 5, side view, X 3i; 

 fig. 6, costal ends of septa, enlarged ; tig. 7, calicular view, x 3; tig. 8, a few septa 

 and pali diagramniatically represented; fig. 9, section through the wall, showing 

 pseudotheca and jisendosynapticular junction of some septa, X 18. 



Figs. 10 to 13. Trochociiathns oaJifortiianus sp. nov 96 



Fig. 10, npright view of a specimen, x 3; fig. 11, base of same specimen, x 3; fig. 12, 

 view of base of another specimen, x 3; fig. 13, npright view of the same speci- 

 men, X 3. 



Figs. 14 to 17. Trochocyathus depressus sp. nov 97 



Fig. 14, upright view; fig. 14a, view of base of the same specimen, natural size; 

 fig. 15, calicular view of a fragmentary specimen, x 3; fig. 16, side of a septum of 

 another specimen, X 3i; fig, 17, costa' of specimens represented by fig. 14, X 2|. 



Figs, 18 and 18a. Trochoci/dthtis stantoiii sp. nov 98 



Fig. 18, ni)right view of specimen; fig. 18a, view of base of the same, X about IJ. 



Figs. 19 to 19b. Trochocyathus c\»<iiilatus sp. uov 99 



Fig. 19, npright view of sijecimen; fig. 19b, calicular view of same, both X 2; 

 fig. 19a, co.sta' enlarged. 



Figs. 20 to 23. Trochocyathus chirlccanus (Vanghan) 100 



Fig. 20, X 3J; fig. 20a, calicular view of the same, X 3^; figs. 21 to 23, three speci- 

 mens, X 2. 



Fig. 24. Trochocyathus striatus (Gabb) 101 



Fig. natural size. 

 Figs. 2, 5, and 20 drawn l)y ,T. Henry Blake; all others by Dr. .1. C. McCounell. 



222 



