649 



PiNNU. 



Pinnularia crassa, Dawson, Ac. Geol. XIII. 



Pinnularia dispalans. Dawson, Acadian Geology, 1868, 

 page 555, fig. 194 L. Upper Devonian shale 

 at St. John, N. B.— VIII-IX, 



Pinnularia elongata, Dawson, Foss. 

 L Plants, Canada, 1871. YIII-IX. 



Piniiularia ficoides, Lesq. See figure above. 



Pinnularia horizontalis, Lesq. See figure above. 



Pinnularia nodosa, Daws. 1871. VIII-IX. 



Pinnularia palmatifida, Lesq. 1858. XIII, 



Pinnularia pinnata, Lesq. See figure above. 



Pinnularia ramocissima, Dawson, Acadian Geology, 1868, 



,65 p. 444, fig. 165, D ; '^slen. 

 der roots, or stems 

 branching in a pinnate 

 manner and somewhat 

 Dawson irregularly;" abundant 



in coal shales; probably the aquatic roots of Calamites^ etc. ; 

 always flattened ; originally round, with a thread like axis of 

 ladder shaped vessels, in a soft smooth cellular bark. (Dawson) 



—XIII 



( Omitted from page 645^ ahove.) 



Piloceras explanator, Whitefield, Bull. Amer. Mus. N. H., 

 N. Y., Vol. 1, No. 8, 1886, p. 323, fig. 1, side view of lower end of 

 large shell, the siphon protruding below the broken septa; the 

 upper part (not figured) having five more chambers, beside 

 the outer chamber, making the whole specimen eight inches 

 long above the siphon ; fig. 2 (only the lower end preserved), 

 longitudinal section of a specimen, a^ a, the solid part of the 

 siphon, 5, solid matter filling the cavity; fig. 3 (cut ofi" above), a 

 large siphon broken open lengthwise ; ^, the siphonal cavity ; 

 d^ solid matter filling it ; a, a layer of deposits which separates 

 it from those below ; 5, several thinner layers of deposit, but 

 not septa ; c, a faulted layer apparently interrupted in its 

 growth ; fig. 4, see also wood cut on p. 434. See Whitfield's dis. 

 cussion of Salter's genus and his own spicies on pp. 324, 326 — 

 Fort Cassin, Vt. Birdseye limestone lie. — {Fig, on p. 650,) 



