276 SYSTEMATIC PALEONTOLOGY 



VERMES 



Order TUBICOLA 



Genus CORNULITES Schlotheim 

 CORNULITES FLEXUOSUS (Hall) 



Plate LVI, Fig. 18 



Tentaculites ? fiexuosa Hall, 1847, Pal. New York, vol. i, p. 92, pi. xxix, 



figs. 6a-d, p. 284, pi. Ixxviii, figs. 2a, b. 

 Cornulites flexuosus Hall, 1888, Pal. New York, vol. vii, Supp. 1; p. 18, 



pi. cxv, figs. 41, 42. 



Description. " Tubes single or aggregate, adhering, more or less 

 curved at the tip or along the whole length ; surface marked by strong 

 ammlations somewhat irregular; interior distinctly septate; septa with 

 the concave sides upwards/' Hall, 1847. 



Occurrence. MAETINSBURG SHALE (Eden division). Jordans Knob, 

 one and one-half miles northeast of Fort Loudon, Pennsylvania, and Tus- 

 carora Mountain, two and one-half miles southeast of McConnellsburg, 

 Pennsylvania. 



Collections. Maryland Geological Survey, IT. S. National Museum. 



WORM BURROWS (?) 



Genus SCOLITHUS Haldemann 



SCOLITHUS LINEAEIS (Haldemann) * 



Plate XXV, Fig. 9 



Fucoides ? linearis Haldemann, 1840, Supp. Monograph Limniades, p. 3. 

 Scolithus linearis Hall, 1847, Pal. New York, vol. i, p. 2, pi. i, figs, la-lc. 

 Scolithus linearis Walcott, 1890, 10th Ann. Rep. U. S. Geol. Surv., p. 603, 

 pi. Ixiii, figs. 1, la-c. 



Description. The pencil-like fillings of the worm burrows to which 

 the above name is applied have a wide distribution in the arenaceous 

 Cambrian rocks of Eastern North America. The species is determined 

 in large part by its geological position and by the diameter of the tubes. 

 JScolithus linearis forms free cylindrical or subcylindrical, unbranched, 



