DESCRIPTIONS OF SPECIES, 105 



Museum material from near Squankum, New Jersey; therefore we know 

 both the horizon and locahty of the species accurately. The matrix of 

 the specimens is a coarse-grained glauconitic sand, with some finer light- 

 colored calcareous material. The interseptal loculi are occasionally quite 

 deceptive in appearance. They are often filled with grains of glauconite, 

 between which are shreds of the lighter-colored material. The result of 

 this is to give, quite frequently, the appearance of a very well developed 

 endotheca. This appearance is described, because it might deceive one who 

 is not accustomed to handling corals that have suffered from the effects of 

 fossilization. This species, strange to say, seems to have its nearest ally in 

 TrocJiocyatlms sitteli Merriam, from Martinez, California. The resemblance 

 is not very great, as a comparison of the descriptions and figures of the two 

 species will show. Attention is directed especially to the difference in the 

 characters of the costfe. 



Genus PARACTATHUS Milne-Edwards and Haime. 



Paraoyathus altbrnatus sp. nov. 



PI. VIII, figs. 11 to 14b. 



Form compressed conical, with the base truncated, attached at the 

 truncation. In one specimen the place of attachment has been almost com- 

 pletely covered by a subsequent calcareous coating, leading to the inference 

 that in the adult stage the individuals may be free. Costae corresponding 

 to all of the septa, distinct, acute, subacute, or rounded in profile, granulate, 

 alternating in prominence. Wall rather thin and not of uniform thickness. 

 Septa slightly exsert in four cycles, six systems, in some systems members 

 of the fifth cycle. Those of the first two cycles reach the columella, those 

 of the third cycle fuse b}^ their edges to the sides of the second; sometimes 

 the fourth fuse similarly to the third. Surfaces granulate. Pali before all 

 the septa except the last cycle, bilobed, granulated on sides. Rudimentary 

 dissepiments present. Columella fascicular, papillate. Depth of calice 

 about one-tliii-d tlie len"-tli of the corallum. 



