47 



have no idea how it attached or to what genus or species it belonged. 

 When a proboscis is prolonged or balloon-shaped, the oritice is at or 

 near the summit. This has no orifice on top. We have occasionally 

 seen crinoidal matter that did not seem to belong to any of the es- 

 tablished orders, and quozre, have we such a specimen here. We are 

 free to say, we do not know where it belongs and, therefore, do not 

 name it; but illustrate it to call special attention to it, beside we 

 have only the specimen illustrated. 



Found by R. A. Blair in the Burlington Group, at Sedalia, Mis- 

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



CLASS BRACHIOPODA. 

 Order LYOPOMATA. 

 Family CRANIIDiE. 



CRANIA CHESTERENSIS, n. sp. 



Plate III, Fig. 24, specimen on the fenestrated portion of a 

 bryozoan; Fig. 25, two specimens on bryozoan; 

 Fig. 26, specimen on a shell. 



Shell rather below medium size or about as large as Crania 

 scabiosa, from the Hudson River Group, and very much like it in 

 general appearance. 



It is thin, discoid and subcircular in outline. The dorsal valve 

 appears as if collapsed, or depressed in the visceral area, so as to 

 leave an elevated rim just within the margin. The margin outside 

 of the middle of the elevated rim is marked with lamellose lines of 

 growth and sometimes one or two lamellose lines of growth may be 

 detected within this elevated border, but generally the surface is 

 smooth. There are no radiating lines. The apex of the dorsal valve 

 consists of a smooth, obtusely pointed, subcentral elevation that 

 rises about one-half higher than the elevated border. The ventral 

 valve is unknown. 



This species is found attached to the hardened borders and some- 

 times to the fenestrated expansions of Lyropora lyra, Hall, of which 

 Lyropora ranoscultim, Ulrich, is a synonym, Lyropora subquad- 

 rans, Hall, and Lyropora quincuncialis, Hall, of which Lyropora 

 diver gens, Ulrich, is a synonym. It is also found attached to the 



