286 J. M. Clarke—Devonian Spores. 
purposes they may be divided into jlattened and unjflattened 
spores, as only the latter show traces of structure. 
FLatreNepD Spores.—Sporangites Huronensis Dawson. 
In the Genesee rocks the spores, as far as observed, are 
always in this condition, but are not common. The bitumi- 
nous shales of the Marcellus are often crowded with masses of 
spores of the same size and appearance as those of the Genesee. 
In their flattened condition they measure about one-third of a 
millimeter across, in substance consisting of a thin black 
carbonaceous film, which, by transmitted light, is of a deep 
orange hue. Specimens from Ohio, kindly sent me by Pro: 
fessor Orton, are similar in shape but somewhat larger and of a 
light amber yellow. Dawson’s specimens from Kettle Point 
were also of a light yellow. These bodies, as well as those 
belonging to the first two of the subdivision following, I 
should regard as macrospores and not as sporocarps. 
UNFLATTENED Spores. 
These divide themselves into three groups. 
1. Sporangites Huronensis Dawson. 
t ‘oodlawn Cemetery in the former place t but one 
spot, viz: Padelford’s, in the township of Canandaigua, on the 
» Ae ., have rocks been found in situ which bear these 
sils, Leiorhynchus limitaris Vanux., Chonetes mucronata H., Pro 
ductella truncata H., Leiopteria laevis H. (Goldfs. ?), the charac: 
teristic invertebrate fossils of these rocks, and the only plan 
known here is Pstlophyton. 
2. Sporangites Huronensis ? 
In the loose bowlders from the Corniferous limestone on Mud 
Creek in the town of East Bloomfield, occur spores which pre 
periphery and on the interior surface, on both surfaces limited 
by a black carbonaceous line. Between the two surfaces the 
