MEDINAN, NIAGARAN, AND CHESTER FOSSILS 
63 
This type specimen is associated on the same slab with Dictyo- 
nema scalariforme creditensis Foerste, and was found in the basal 
part of the Manitoulin dolomite, directly over the Whirlpool 
sandstone, the two lower members of the Medinan formation in 
southern Ontario. It was found in the quarry a quarter of a 
mile west of Credit Forks station, on the northern side of the 
deep valley which crosses the railroad south of the station. Here 
the Whirlpool sandstone forms the base of the quarry, and 
Leveilleites occurs in fair abundance in the basal layers of the 
Manitoulin dolomite, which here is quarried extensively. 
Associated with Leveilleites in other slabs from the same lo- 
cality and horizon are Leptaena rhomhoidalis Wilckens and a 
species of coral resembling Enterolasma facetus Foerste in size 
and form. The Leptaena is 23 mm. in width. The coral is 25 
mm. in length, measured along its convex side, and 15 mm. in 
diameter at the top. It is curved at the base very much as in 
figure 5, plate V, of Dr. M. Y. Williams’ memoir.^o These 
fossils indicate the marine character of the deposits containing 
Leveilleites. 
The type of Leveilleites hartnageli belongs to the collection of 
C. A. Flartnagel, a member of the Geological Survey of New 
York. The reverse of the same specimen belongs to the collec- 
tion of Dr. E. O. Ulrich, of the United States National Museum. 
The species is named in honor of Air. Hartnagel, one of the 
original collectors. 
Similar specimens. — Among the numerous separate fronds of 
Leveilleites found at the type locality and horizon, those repre- 
sented by figures 4, 5, 6, 11, and 12 on plate V are similar in 
presenting 6 to 8 strongly divided lobes in a length of 10 mm.; 
figure 26 on plate IV is the reverse of figure 5 on plate V. Speci- 
men 5 is represented also on plates VII and X, and specimen 26 
is represented also on plate VII. 
In specimen 4 the lobes are convexly curved on the side ex- 
posed to view, and they evidently are continuous laterally, the 
1'’ Williams, M. Y., The Silurian Geology and Faunas of Ontario Peninsula and 
Manitoulin and Adjacent Islands: Geol. Surv. Canada, Memoir 111, 1919. 
