87 



ridge that terminates at the lateral suture between the first ra- 

 dials called the "oral ridges." The pseudoambulacra are nar- 

 row and each one shows a dividing line or furrow from the 

 central oral opening half way to the angles of the pentagon. 

 There are eight hydrospire slits in each of the eight areas be- 

 tween the oral ridges and the pseudoambulacra. 



The general form and eight hydrospire slits in each field will 

 distinguish this species. 



Found by R. A. Blair, in whose honor the specific name is 

 proposed, in the Chouteau limestone near Sedalia, Missouri, 

 and now in the collection of S. A. Miller. 



SUBKINGDOM CCELENTERATA. 

 Class ANTHOZOA, 

 Subclass ZOANTHARIA. 

 Family ZAPHRENTID^E. 



HADROPHYLLUM TENNESSEENSE, n. Sp. 



Plate V, Fig. 16, summit view of a slightly convex specimen; Fig. 

 18, summit view of a more convex specimen; Fig. 17, 

 lateral view of same; Fig 19, basal view. 

 Corallum medium size, short, longitudinally double convex, 

 transversely elliptical. Calyx convex, sometimes very highly 

 convex and having a flattened or slightly concave central area, 

 the greater convexity is opposite the septal fossette and above 

 the place of attachment or commencement of growth. A thick- 

 ened septa occupies the center of the septal fossette running 

 with the longer diameter of the calyx from the central part to 

 the border; the septal fossette extends around the central end 

 of the thickened septa and its sides, from which the lateral 

 septa radiate to the border. The lateral fossettes are incon- 

 spicuous, but are indicated by a depression from the center to 

 the lateral borders. The radiating septa are unequally devel- 

 oped, those upon the sides of the septal fossette are much 

 shorter than the others. There are from twenty-two to twenty- 

 six in the specimens examined. The point of attachment or 

 place of commencement of growth is subcentral or below one 



