268 CRETACEOUS PALEONTOLOGY. 



wall has frequently been destroyed so that the edges of the septa 

 are clearly seen upon the sides of the coirallum. 



Formation and locality. — Hornerstown marl, near New Egypt 

 (142) ; Manasquan marl, near Farmingdale (138). 



Geographic distribution. — New Jersey. 



Genus Trochocyathus Milne-Edwards and Haime. 



Trochocyathus woolmani Vaughan. 



Plate v., Figs. 5-7. 



1900. Trochocyathus woolmani Vaughan, Proc. Acad. Nat. Sci. 



Phil. (1900), p. 436. 

 1905. Trochocyathus woolmani Johns., Proc. Acad. Nat. Sci. 



Phil. (1905), p. 4. 



Description. Corallum short, attached, inversely conical, trans- 

 verse outline circular. Wall rather thick, naked, ornamental 

 externally by 24 costae, corresponding to all cycles of septa, 

 and showing a fairly reg-ular alternation of larger and smaller — 

 i. e., there are 12 larger costas of the same size corresponding 

 to the septa of the first and second sycles, and 12 smaller 

 corresponding to the septa of the third cycle; near the calice 

 they are prominent, with acute edges and broad bases, as 

 the base of the corallum is approached they decrease in promi- 

 nence; they possess granulations along their edges, and some 

 scattered granulations on the sides. Septa arranged in three 

 cycles, divided into six systems; the septa of the first cycle are 

 appreciably larger than the others, and pass directly from the 

 corallum wall to the columellar space without forming any part 

 of any septal group; the septa of the third cycle bend towards 

 the members of the second, and fuse to the sides of the latter 

 below the level of the calice; the septal margins project very 

 slightly above the upper edge of the corallum wall ; the septal 

 faces are ornamented with distant subconical granulations. The 

 inner end of each of the primlary septa is thickened, the thicken- 

 ing apparently representing a palus, and before each group of 

 the members of the second and third cycles is what appears to 

 be a slender palus, therefore, there apparently are slender pali 



