PLATE lY. 



Flabellum, Aldriohia, Platytrochxts. 



Page. 



Figs. 1 to 3a. Flahellinn ciineijorme var. wailcsi C'ourad 64 



'^ . ,/ Figs. 1 and 2 normal, but larije, specimens; figs. 3 and 3a, a small conical form, refer- 



able to this variety. All figures natural size. 



Figs. 4 and 4a. Flabellum cuneiforme var. magnomslaliim var. nov 65 



Two views of the same specimen, both natural size. 



Figs. ."> and 6. Flabellum remondianiim Gabb r 67 



Fig. 5, view of flatter side of specimen ; cross section of another specimen. 



Figs. 7 to 10. Flabrlliim mortoui sp. nov 66 



Figs. 7, 8, and 9, views of three specimens, all natural size ; fig. 8a, surface of speci- 

 men enlarged to show alternation of cost* and septa; fig. 10, cross section of a 

 corallum, magnified slightly more than four times, to show septal arrangement. 



Figs. 11 to 12. Flabellum californicum sp. nov 69 



All figures natural size. 



Figs. 13 to 14. Flabellum rlioniboUleiim sp. nov 69 



Fig. 13, upright view, X li; fig. 13a, small portion of surface enlarged; fig. 13b, 

 another view of the same specimen, x lA ; fig. 13c, calicular view, x about 2; 

 fig. 14, longitudinal section of a corallum, x 2. 



Figs. 15 to 19, Aldrichia eleyans gen. et. sp. nov 70 



Figs. 15 and 18, upright views of two specimens, Hatter side toward the observer, 

 X 3; figs. 16 and 17, upright views of two speciuieus, enlarged slightly more than 

 four times; fig, 19, longitudinal section of a corallum, enlarged about ten times; 

 fig. 17a, calicular view of specimen represente<l by fig. 17, X 8. 



Figs. 20 to 24, I'lati/troclius stokesi (Lea) 74 



Figs. 20 to 23, upright views of specimens, as seen looking at sides ; figs, 20 and 22, 

 X 3; fig, 21, X 4|; fig, 23, x 31; fig, 23a, costa' of specimen represented by fig, 

 23, X 8; fig, 24, longitudinal section of a corallum, showing the structure of the 

 columella, etc,, x 6, 



I'igs. 5 and 6 drawn liy II. Chadwick Hunter; fig. 21 by .1. Henry Blake; all others by Dr. J. 

 C. McConnell. 



216 



