Plate 2 



Sphenophycus latifolius (Hall) 



Page 73 



Fig. 1-4 Specimens showing the more common aspects of the fossil 

 Natural size. Figure I shows also a bandlike breaking up of 

 the test; figure 2, the most frequent and typical aspect of the 

 bodies ; figure 3, showing a breaking of the stem into longi- 

 tudinal shreds at b; figure 4, specimen with long, thin pedicel. 

 Fig. 5 Specimen in which the upper test has become exfoliated, revealing 



a flattened interior space. 



Fig. 6 Specimen in which the wrinkling suggests the originally inflated 

 condition of the bulb; it also shows a bandlike shred of the 

 pedicel. 

 Fig. 7,8 Specimens remarkable for the extreme inflation of the bulb. 



Figure 8 shows at b a cylindrical section of the pedicel. 



Fig. 9 Specimen showing a marginal, distal wrinkle and slight extension 



resulting from the flattened apex of the bulb, folded upon itself. 



Fig. 10 Specimen also distinctly showing the apical wrinkle or fold, and a 



slight inflation in the pedicel. 

 Fig. ii Finely preserved specimen showing the flattened oval space at the 



top of the bulb and a bulbous swelling of the pedicel (at a). 

 Fig. 12 Specimen showing finely the apical flattening of the bulb with a 



central, probably accidental perforation. 



Fig. 13 Fragment of fronds of Sphenophycus latifolius, 

 showing their spiral arrangement and the stems of several speci- 

 mens of bulbs. 

 Fig. 14 Circular, originally probably spherical body found associated with 



the bulbs. 



Figure 9-12 are x 2; the others natural size. 



Horizon and locality. Schenectady beds. Aqueduct near Schenec- 

 tady, N. Y. 



Dictyonema arbuscula (Ulrich) 



Page 77 

 Fig. 15 Specimen in natural size. 



Horizon and locality. Indian Ladder beds. Indian Ladder, Albany 

 county, N. Y. 



Dictyonema multiramosum nov. 



Page 78 

 Fig. 16 Holotype. Natural size. 



Horizon and locality. Schenectady beds. Rotterdam Junction, 

 Schenectady county, N. Y. 



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