yerrill, Notes on Radiata. 545 



Smaller septa about half as wide, a little thinner and less elevated, as 

 are also their costal prolongations. Columella a small tubercle, often 

 prominent, sometimes flattened. Internal structure as in the preced- 

 ing, but the transverse septa are nearer together. 



The largest specimens are ten inches to two feet in diameter ; and 

 often a foot thick or high ; some of the prominences or lobes are from 

 four to six inches in diameter, and nearly as high ; diameter of cells 

 mostly '05 to '06 ; distance between them ordinarily "05 to -08. 



Pearl Islands, at extreme low-water of spring tides, — F. II. Iiradley. 



Stephanaria Verriii. 



Stephanocm-a Veriill, Proc. Boston Soc. Nat. History, vol. x, p. 330, 1866, {nou Ehren- 



berg). 

 Stephenaria Verrill, Transactions Conn. Acad., i, p. 340. 1867. 



Coralla compound, consisting of irregular short, lobe-like branches. 

 Cells moderately large, with two or three cycles of septa, which 

 are denticulate on the edge, well developed, and mostly confluent 

 with those of adjacent cells. Walls indistinct or wanting, the divis- 

 ions between the cells indicated only by small, granular points, which 

 sometimes interrupt the septa of adjoining cells. Columellci papillose. 

 Paliform papillae before all the principal septa, the inner ones becom- 

 ing confounded with the columella. 



This genus resembles Si/nartfa V. and Psammocora Dana, but 

 differs from the first in the well developed septa, and many other 

 characters, and from the last in having papilliform pali and columella. 



Stephanaria stellata Verriii. 



Stephnnocora stellita Yerrill, op. cit., p. 330, 1866. 



Plate IX, figures 4, 4^ 



Coralla forming rounded clumps of short, irregularly lobcd and 

 contorted branches, which are very unequal in size and foi-m ; some- 

 times nearly simple and angular, with a large cell at the top ; at other 

 times, even on the same clump, having the summit very much ex- 

 panded, so as to form flattened, contorted lobes, with acute summits 

 and lateral crests, or even mieandriniform lobes. The branches are 

 usually about an eighth of an inch distant, sometimes more, the sides 

 covered with rather large, starlike, shallow cells, one, or several, larger 

 than the others often terminating the branches, which appear to in- 

 crease by the upward extension of one of the edges of these cells by 

 submarginal budding. Septa twelve to twenty, often with other 

 rudimentary ones, rather thick and strong, with sharp, spiny granu- 



