NEW GENEiRA OF PALEOZOIC RUGOSE CORALS 203 



Hapsiphyllum, gen. nov. 



Type: Zaphrentis calcariformis Hall. Fossil corals, Niagara 

 and Upper Held, groups. 1882. p. 33, and 12tli rep't of the state 

 geologist of Indiana, pi. 21, fig. 10, 11. St Louis group, Wash- 

 ington CO. Indiana. 



Corallum small, simple, conical or horn-shaped; calyx circular, 

 comparatively deep, with thin margins; biareal. The outer area 

 is bounded by the external epitheca; the inner area by a sub- 

 vertical wall of horseshoe shape, open on the side of the septal 

 fovea. Two of the larger septa connect with this wall in such 

 a manner as to be apparently a continuation of it, and form a 

 very distinct pyriform septal fovea; septa alternating in size, 



10 



Fig. 10 Hapsiphyllum calcariforme {Hall). A transverse 

 section showing the coalescing septa, and the wall of the inner 

 area, connecting with twO' of the septa. 



the smaller ones continuing for a short distance into the cavity 

 of the corallum, there coalescing with the larger ones, which 

 continue to the inner wall, with which they coalesce, and in 

 which they terminate. Tabulae and dissepiments are present. 



The wall of the inner area, connecting with two of the septa 

 and bounding a portion of the septal fovea, is similar to that of 

 Agonophyllum, but that genus differs from this in several 

 respects, principally in having carinations on the sides of the 

 septa. 



Enterolasma, gen. nov. 



Type: Streptelasma strictum Hall, 26th rep't N. Y. state mu- 

 seum nat. hist. 1874. Pal. N. Y. v. 6, pi. 1, fig. 1-10. Helder- 

 bergian, Clarksville, Albany co. N. Y. 



Examples: Streptelasma caliciilnm Hall. Pal. N. Y. 1852. v. 2, 

 p. 3, pi. 32, fig. la-k. 



