70 LOWER PENINSULA. 



the principal Favositoid characters of the tubes, diapJira^ns, and 

 lateral pores, but I think these organs can be found in his speci- 

 mens as well as in those I have under consideration. 



VERMIPORA NIAGARENSIS, N. Sp. 



Short club-shaped branchlets about one centimeter in thickness. 

 Tubules half a millimeter wide, slowly diverging from an imagi- 

 nary central axis in a curve. The outer free end of the tubes is 

 more abruptly bent, and opens rectangularly to the surface of the 

 stems. In the interior of the stems the tubes are polygonal by 

 mutual pressure ; the free ends are perfectly circular, annulated by 

 delicate wrinkles of growth, and in some a faint longitudinal stria- 

 tion is observable. Transverse diaphragms flat and distant. Pores 

 large, irregularly dispersed. Found in the Niagara group of Point 

 Detour, Lake Huron, and in Iowa, near Masonville. 



Plate XXIV., Fig. 3. — Lower figures are specimens from the 

 Niagara group of Masonville, Iowa, magnified about two diameters. 



VERMIPORA FASCICULATA, N. Sp. 



Small branching stems, from two to five millimeters in diameter ; 

 tubules one half millimeter wide, ascending in almost parallel fasci- 

 cles in the stems, until their ends, with an abrupt bend outward, 

 become free. Diaphragms, intersecting the tubes and connecting 

 pores, are plainly observable, as well as the intercalation of new 

 tubes by lateral gemmation. 



Found in the Hamilton group of Thunder Bay, and frequently 

 in boulders of the drift, which, according to the rock character and 

 associated fossils, belong to the corniferous limestone formation. 



Plate XXIV., Fig. 3. — The upper specimens artificially crowded 

 together. A part of them represent specimens of the corniferous 

 limestone found in the drift ; the outer specimen on the right-hand 

 side and the slender central stem are from the Hamilton group of 

 Alpena. Magnified two diameters. 



