220 Systematic Paleoxtology 



Backbone, Hancock, Maryland ; Hyndman, Pennsylvania. New Scot- 

 land Member. Cherry Eun, West Virginia. 



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



Genus CERATOPORA Grabau 



Ceratopora ? marylandica n. sp. 

 Plate XXVI, Figs. 6, 7 



Description. — Corallites consisting of prostrate tubular cells, branching 

 irregularly; walls of adjacent branches uniting to form irregular clusters. 

 Branches ascending, increasing in diameter rapidly for a short distance 

 near base, then very gradually towards calyx. Theca striated transversely 

 by fine lines with occasional deeper furrows. Walls cystose. Calyx funnel- 

 shaped; depth variable, its sides faintly striated. Orifice circialar. 



Diameter of orifice, 2.5 to 3 mm. 



This species resembles G. jacJcsoni of the Hamilton of Michigan but is 

 much smaller and also differs in its proportions. The generic position of 

 this species is not assured. Its branches are not attached to other organisms 

 as in the genus Aulopora. In habit it closely resembles the genus 

 Ceratopora of Grabau but the cysts do not clearly show the spines supposed 

 to be characteristic of that genus. But two clusters have been observed. 

 Additional material may give clearer evidence as to its generic relations. 



Occurrence. — Helderberg Formation, Keyser Member. Tentaculite 

 zone at Keyser, West Virginia, 2 miles northwest of Six-Mile House on 

 road to Hazen, Maryland. 



Collection. — U. S. National Museum. 



Family HALYSITIDAE 



Genus HALYSITES Fischer 



Halysites catenulatus Linne 



Plate XXVI, Fig. 8 



TuMpora catenularia Linne, 1767, Syst. Nat, 12th ed., p. 1270. 



Catenipora escharoides Hall, 1852, Pal. N. Y., vol. ii, p. 127, pi. xxxv, figs, la-c 



Description. — " Coral in hemispheric masses, composed of oval tubes 

 placed laterally in juxtaposition in a single series, or separated by a cellular 



