224 Systematic Paleontology 



A few localities only are given in the following paragraph : 

 Occurrence. — Helderbehg Formation, Keyser Member. Corrigan- 



ville, Devil's Backbone, Cash Valley, Cumberland, Mar}'land; Keyser, 



West Virginia; Hyndman, Pennsylvania. 



Collections. — Maryland Geological Survey, U. S. National Museum. 



Genus SYRINGOSTROMA Nicholson 



Syringostroma barretti Girty 



Plate XXVIII, Figs. 3, 4 



Syringostroma barretti Girty, 1895, 48th Rept. N. Y. State Mus., voL il, p. 



296, pi. vii, figs. 5, 6. 

 Syringostroma barretti Parks, 1909, Univ. Toronto Studies, Geol. Ser., No. 6, 



pp. 16-19. 

 Stromatopora barretti Grabau and Shimer, 1909, N. Amer. Index Foss., voL i, 



p. 45, flg. 72. 



Description. — " Ccenosteum large, hemispherical, spreading. Lati- 

 laminse distinct, more or less labyrinthine towards the center, on the 

 periphery flowing in broad folds. They end abruptly on the under side, 

 and are attached directly without an epitheca. Laminaj parallel and 

 gently flexuous. Astrorhizje not numerous, but large and conspicuous. 

 The nucleus of an astrorhizal system is sometimes represented by an axial 

 tube, and the laminae at that point are often elevated into a low monticule. 

 Skeletal tissue finely fibrous, but a little coarser than in ^S'. centrotum. 



" This species is characterized by the infundibuliform, concentric 

 growth and the fiat base without an epitheca ( ?) . Without the aid of thin 

 sections, the outer surface of the type specimen appears dense, fine- 

 grained, and structureless, except for latilamina;, which separate in un- 

 usually thin sheets. Sections near the surface are without monticules, 

 astrorhizse and axial tubes, exhibiting only the uniform, porous skeleton 

 and fibrous structure. The same surface characters are presented by the 

 basal portion and suggests an epithecate condition, but it has not the 

 polished surface and concentric wrinkles characteristic of the epitheca in 

 Favosites." Girty, 1895. 



Kadial sections show thin, remote, horizontal laminae, about 1 mm. apart, 

 each appearing as a delicate fiber crossing space between pillars. Vertical 

 pillars distant, 4 or 5 in 1 mm., separated by wide tubular spaces. 



