202 



NEW YORK STATE MUSEUM 



This genus in the manner of the formation of the inner wall 

 resembles Duncan e 11a truncata, but differs from that 

 species in its frequent tabulae, and in the presence of tabulae in 

 the central cylindric space. 





Fig. 7 Laccophyllum acuminatum. A lateral view, nat. size 



8 A longitudinal section showing oblique tabulae, inner wall, and the 



horizontal tabulae of the central space, enlarged 



9 Ti'ansverse section showing the septa and the inner wall, enlarged 



Laccophyllum acuminatum, sp. nov. 



Corallum small, cylindrico^conical, usually straight, but some- 

 times slightly curved; hight from 15 to 18 mm; diameter of the 

 calyx from 6 to 9 mm; costae very prominent; septa alternating 

 in size, the larger ones extending to within a short distance 

 of the center, sometimes fasciculating, the extremities thicken- 

 ing, coalescing and forming an inner wall; tabulae frequent, 

 curving abruptly upward, frequently presenting a cystose ap- 

 pearance. In the central space formed by the inner wall are 

 frequent horizontal tabulae, somewhat stronger than the others, 

 and apparently unconnected with them. 



Formation and locality : Niagaran group. Perry co. Tenn. 



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