2 ;o CRETACEOUS PALEONTOLOGY. 



of the fourth will fuse to the sides of those of the third, thus 

 inclosing the members of the fifth. The septal grouping does 

 not seem to be absolutely regular, but the tendency to form septal 

 groups is well pronounced. The septa are thin, somewhat rlexu- 

 ous near the center, thicker at the wall, all of them except the 

 youngest member of each system, have distinct elongate elliptical 

 or clavate thickenings on their inner ends, which are probably 

 pali, and are arranged in two rather definite crowns. Septal faces 

 granulated, no endotheca. Columella small, composed of a few 

 more or less twisted ascending laths, to which the larger septa 

 fuse by their flexuous inner margins. (Adapted from Vaughan.) 



The dimensions of a nearly complete corallum are : greater 

 diameter of the calice, 18 mm. ; lesser diameter of the calice, 

 15 mm. ; height of the corallum, 27 mm. 



Remarks. This species is the least common of the three which 

 occur in the Manasquan marl, and may be easily distinguished 

 from the others by the curvature of the corallum in the plane of 

 the lesser axis of the calice, and, when the outer surface is well 

 preserved, by the rows of fine granules. 



Formation and locality. Manasquan marl, near Farming-dale 

 (138). 



Geographic distribution. New Jersey. 



Genus PARACYATHUS Milne-Edwards and Haime. 



Paracyathus vaughani n. sp. 

 Plate V., Figs. 11-13. 



Description. Corallum subcylindrical in form, with a broad 

 spreading base so that the diameter of the basal disk by which it 

 is attached is as great or greater than the thickest portion of the 

 corallum above; immediately above the base the outer wall con- 

 tracts somewhat abruptly for a short distance, and then increases 

 gradually in diameter to the summit. The calice is very deep, 

 reaching almost to the base of the corallum. The outer surface of 

 the theca is marked by about 40 longitudinal, finely denticulate 

 costae, which continue across the expanded basal portion. The 

 characters of the septa are not clearly shown in the type specimen, 

 but they are apparently of the same number as the external costae. 



