147. CONTRIBUTION TO 



and twisting into a false calumella; in some cups the larger lamella; does not 

 fasiculate and twist into an elevation, but continues after coalescing to the cen- 

 ter of the calix, and gradually disappears, leaving a flat space in the center of 

 the cup from six to eight millimeters in diameter. Fossette well defined, it 

 consists of a deep depression at the edge of the flat space in the bottom of the 

 calix, and extends to the anterior margin. Denticulations not so prominent irt 

 all the cups, ten in the space of seven millimeters. 



Found in the Middle Devonian (Upper Helderberg group( near Gibson's- 

 Station, Clark County, Indiana. Now iu the collection of the author. 



DOLATOCRINUS M U LT I NO DO S US , N. Sp., (Rowley) 



Plate U. Figs. 1, 2, 3. 



Dorsal cup much broader than long, slightly constricted below the arm 

 bases. 



The flattening of the base extends outward to the second radials. The cen- 

 ter of each plate of the radial series contains a conspicuous tubercle, and from 

 the second radial up these tubercles are connected by a low" indistinct ridge. 



Each radial tubercle is the center of a series of low ridges that pass outward 

 toward the plate perimeter, becoming obsoiete tiiere. These ridges either con- 

 nect with the tubercles or are barely disconnected. 



The center of each large interradial plate is occupied by from one to three 

 tubercles that give off in all directions ridge-like rays which become obsolete at 

 the plate sutures. These ridges, as in the case of the radials, are sometimes 

 connected with the tubercles and again slightly disconnected. 



The tubercles of the first and second radial plates and the first radial and 

 basal plates are not noticeably connected by ridges. The tubercles of the first 

 radials are the largest on the body. 



The second interradials have each a central broad node surrounded by node- 

 like ridges. 



The upper edges of the basal plates form a circular ridge about the basal 

 concavity. 



The plates of the ventral surface have small central tubercles surrounded 

 by still smaller nodes. 



The proboscis is subcentral and small. 



There are eighteen arm openings arranged as follows : 4, 4, 4, 3, 3. 



The basal concavity is rather large as is also the star-shaped canal. 



