196 SYSTEMATIC PALEONTOLOGY 



Specimens of a ramose bryozoan-like fossil with a central canal have 

 been found at several localities in the Beekmantown of the Appalachian 

 Valley in Maryland and Pennsylvania. These agree in all respects with 

 the species described above by Billings, which unfortunately has never 

 been figured. In order to establish the species the original types or speci- 

 mens from the type locality must be further investigated and illustrated. 

 Until this has been done the identification of the species in the Appa- 

 lachian Valley must be considered as provisional. The type specimens 

 are from the Romaine division of the Canadian, Mingan Islands, Quebec. 



Occurrence. BEEKMANTOWN LIMESTONE. Lower part above the Stone- 

 henge horizon, just east of Hagerstown, Maryland. Also at the same zone 

 in the Chambersburg quadrangle of Pennsylvania. 



Collection. U. S. National Museum. 



Genus CAMAROCLADIA Ulrich and Everett 

 CAMAROCLADIA RUGOSA Ulrich 



Plate XLII, Fig. 6 



Camarocladia rugosa Ulrich, 1897, Geol. Minnesota, vol. iii, pt. 2, p. xcv, 

 foot note. 



Description. The fucoid-like remains upon which this species is based 

 appear to be the cast of a branching sponge, although the specimens 

 seldom show structure and appear most frequently as flattened, stony 

 branches with more or less obscure oblique and transverse furrows. These 

 compressed flexuous branches bifurcate sometimes close together and 

 other times far apart. The branches vary from 5 to over 12 mm. in 

 width and are sometimes so crowded in the rock as to form a regular 

 network or matting. In the best preserved examples, the surface is 

 covered with an irregular network of coarse, nodulose threads often 

 arranged longitudinally and generally on one side of the branch only. 

 When removed from the rock the stems are found to be composed of two 

 fairly well-defined portions, (1) a siphuncle-like, subcylindrical rod, 

 with annulations and constrictions 3 to 6 mm. apart, and (2) a series 

 of oblique septa-like partitions, generally two to each annulation, clasp- 



