ILLUSTRATIONS 
Page. 
Plate I. Upper Falls of Genesee River, Rochester, Monroe County, N. Y 2 
II. Niagara Gorge below the Suspension Bridge, Niagara County, N. Y.; view 
from the Canadian side 4 
III. View of a slab, X 1-4, showing assemblage of species 70 
IV. Figs. 1, Vinella? multiradiata Ulrich and Bassler; 2, 3, Vinella radici- 
formis (Vine); 4, 5, Rhopalonaria attenuata Ulrich and Bassler; 6-8, 
Ascodictyon siluriense Vine; 9, Allonema waldronense Ulrich and 
Bassler; 10-14, Stomatopora elongata (Vine); 15-19, Stomatopora dis- 
similis Vine 72 
V. Figs. 1-5, Berenicea consimilis (Lonsdale); 6, 7, Diploclema sparsum 
(Hall); 8, 9, Diploclema sparsum argutum n. var.; 10-12, Mitoclema 
sarlei n. sp 74 
VI. Figs. 1-10, Ceramopora imbricata Hall; 11-13, Ceramopora niagarensis 
n. sp 76 
VII. Figs. 1-3, Fistulipora lockportensis n. sp.; 4-6, Fistulipora laminata 
(Hall); 7-10, Fistulipora crustula n. sp.; 11-15, Fistulipora tubercu- 
losa (Hall) 78 
VIII. Figs. 1-4, Spatiopora maculata (Hall); 5, 6, Meekopora foliacea (Hall); 
7, 8, Fistulipora tuberculosa (Hall); 9, 10, Fistulipora laminata Hall; 
11-15, Chilotrypa ostiolata (Hall); 16, 17, Fistulipora crustula n. sp. . 80 
IX. Figs. 1-4, Chilotrypa ostiolata (Hall); 5, 6, Meekopora foliacea (Hall); 
7-9, Ceramoporclla irregularis n. sp.; 10, 11, Spatiopora maculata 
(Hall); 12-15, Ceramoporclla orbiculata (Ringueberg) 82 
X. Figs. 1-4, Mesotrypa nummiformis (Hall); 5-8, Orbignyella magnopora 
n. sp. ; 13-16, Rhombotrypa spinulifera n. sp 84 
XI. Figs. 1-3, Lioclema asperum Hall; 4-6, Lioclema multiporum n. sp.; 7-10, 
Lioclemella maccombi n. sp.; 11-13, Lioclema ramulosum n. sp.; 14, 15, 
Eridotrypa nodulosa n. sp 86 
XII. Figs. 1-3, Eridotrypa spinosa n. sp.; 4-6, Eridotrypa striata (Hall); 7-9, 
Eridotrypa solida (Hall) ; 10-14, Eridotrypa similis n. sp 88 
XIII. Figs. 1-5, Batostomella granulifera (Hall); 6, 7, Bythopora spinulosa 
(Hall); 8-10, Lioclema explanatum n. sp.; 11-14, Lioclema circinctum 
n. sp. ; 15, 16, Trematopora tuberculosa Hall 9C 
XIV. Figs. 1-5, Diplotrypa walkeri n. sp.; 6-9, Stigmatella globata n. sp.; 
10, 11, Nicholsonella florida (Hall); 12, 13, Nicholsonella ringuebergi 
n. sp 9£ 
XV. Figs. 1-8, Callopora magnopora Foerste; 9-12, Callopora clausa n. sp... 94> 
XVI. Figs. 1-5, Monotrypa osgoodensis n. sp.; 6-9, Monotrypa benjamini n. sp.; 
10-13, Monotrypa pediculata n. sp. 9( 
XVII. Figs. 1-3, Trematopora tuberculosa Hall; 4-10, Idiotrypa punctata 
(Hall) ; 11-15, Callopora elegantula Hall 9! 
XVIII. Figs. 1-5, Phylloporiria asperato-striata (Hall); 6-9, Pseudohornera dif- 
fusa (Hall); 10, Nematopora minuta (Hall); 11, 12, Pachydictya crassa 
(Hall); 13-16, Loculipora ambigua (Hall); 17-19, Thamniscus dicho- 
tomus (Hall) ; 20, Pseudohornera niagarensis (Hall) 10 
IV 
