Maryland Geological Survey 217 



at axis of corallum, increasing in tlaickness towards oriiice where walls 

 are about as thick as width of orifice. Calyx funnel-shaped, oblique to sur- 

 face, forming a lip below and a broad concave space above ; orifices distant 

 about 0.5 mm. in specimens observed, arranged in vertical rows separated 

 by somewhat irregular ridges. The orifice contracts below into a narrow 

 tube whose walls are nearly as thick as its internal diameter. A line is 

 observed through center of walls in thin sections showing that adjacent 

 corallites are separate. Tabulge and pores not observed. 



Diameter of corallite 1.5 to 2 mm. 



This species is restricted to a zone above the base of the Keyser member 

 where it is profuse, being found at most localities where that horizon is 

 exposed. 



Occurrence. — Helderberg Formatiox, Keyser Member. Keyser, 

 West Virginia ; Knobly Mountain, 6 miles south of Cumberland ; Pinto ; 

 Cookerly ; Devil's Backbone ; Flintstone. 



Collection. — Maryland Geological Survey. 



Cladopora of. rectilineata Simpson var. 



Description. — A variety of this species difi^ers from the typical form in 

 having larger branches (2 to 4 mm. diameter) and hence more numerous 

 corallites, about 20 corallites occurring in the larger branches. A few 

 tabula} are present. This species suggests Cladopora multiseriata Weller 

 of the Coeymans of New Jersey, but difi'ers in having smaller corallites, 

 about 10 or 11 occurring in a space of 5 mm. while 5 to 7 occupy the same 

 space in the form described by Weller. Associated with Cyathophyllum 

 inequale upon a specimen whose exact horizon is not known. 



Occurrence. — Helderberg FoR:irATiox, Keyser Member. Locality un- 

 known, perhaps east of Flintstone. 



Collection. — Maryland Geological Survey. 



Cladopora multiseriata Weller 



Cladopora multiseriata Weller, 1903, Pal. N. J., vol. iii, p. 271, pi. xxvi, figs. 

 2,3. 



Description. — " Corallum consisting of cylindrical branches, which oc- 

 casionally divide. Corallites cylindrical, directed obliquely to the axis of 



