192 SYSTEMATIC PALEONTOLOGY 



Genus PALyEOPHYCUS Hall 



PALJEOPHYCUS TUBULAEE Hall 



Plate XXXI, Fig. 1 



Palceophycus tubulare Hall, 1847, Pal. New York, vol. i, p. 7, pi. ii, figs. 1, 

 2, 4, 5. 



Description. Although formerly considered as seaweeds, the fossil 

 remains described under this name, and related so-called genera and 

 species, are of very doubtful origin. The particular form here illustrated 

 is interesting because it occurs in such widely separated areas, although 

 the two formations in which it is found are believed to be of the same 

 age. The specimens as observed on weathered surfaces consist of un- 

 evenly bent or flexuose cylindrical stems sometimes gradually tapering 

 to a point, irregularly branched and often bifurcated. In Maryland, as 

 in New York, these stems when weathered appear as if hollow. The 

 stems and branches are usually much compressed, smooth, and preserve 

 no traces of structure. 



Occurrence. BEKKMANTOWN LTMESTONF (Stonehenge member). Sev- 

 eral localities in the vicinity of Hagerstown, Maryland. Tribes Hill 

 Limestone. Amsterdam, Canajoharie, etc., New York. 



Collection. U. S. National Museum. 



Genus SOLENOPORA Dybowski 



SOLENOPORA COMPACTA (Billings) 



Plate XLI, Figs. 1-3 



Stromatopora compacta Billings, 1865, Pal. Foss., vol. i, Geol. Surv. Canada, 



pp. 55, 212. 

 Tetradium peachii Nicholson and Etheridge, 1877, Ann. and Mag. Nat. Hist., 



4th ser., vol. xx, p. 166, text figs. d-g. 

 Solenopora spongioides Dybowski, 1877, Die Chaetetiden der ostbaltischen 



Silur. Formation, p. 124, pi. ii, figs, lla-b. 

 Tetradium peachii var. canadense Foord, 1883, Cont. Micro-Pal., Geol. Surv. 



Canada, p. 24, pi. vi, figs. 1-lf. 

 Solenopora compacta trentonensis Brown, 1894, Geol. Mag. London, dec. 4, 



vol. i, p. 146, text fig. 2. 

 Solenopora compacta Winchell and Schuchert, 1895, Geol. Minnesota, Pal., 



vol. 3, pt. i, p. 80, pi. F, figs. 21-23. 

 Actinostroma trentonensis Weller, 1893, Geol. Surv. New Jersey, Pal., vol. 3, 



p. 139, pi. vi, fig. 8; pi. vii, figs. 3, 4. 



