OF DENISON UNIVERSITY. 
21 
the opposite side at an acute angle, the resulting surface being slightly 
concave. 
Our specimens are fragments which do not furnish material for 
careful description. The symmetrical relation of the two sides indi- 
cates a cephalopod in spite of the apparent absence of septa. The 
siphuncle seems to be central. 'Fhe greatest diameter was not less 
than 75 mm; dorso-ventral diameter of volution near end, 15 mm ; 
lateral diameter of volution, 6 mm ; the width of the plane dorsal 
margin is 3 mm. N. pauper, Whitfield may prove identical with our 
form, but it would not be suspected except from incidental similarities 
and the fact that our form is derived from the same horizon at Ful- 
ton ham. 
West of Fultonham, two or three miles, are exposures which per- 
mit the reconstruction of the following section : 
Coal measure sandstone (exposed) 10 ft. 
Bituminous shale 2,% h- 
Limestone ’ 18 in. 
Shale (many fossils) 2 ]/n ft. 
Sandy layer ^-6 ft. 
Finn limestone 6-10 ft. 
Shale ; 3-6 ft. 
Reddish and grey silicious shale and free-stone — Waver- \ 
ly (exposed) 10 ft. 
Tlie section not being continuous may not be very accurate, but 
expresses the approximate relations. No inconformity could be de- 
tected between the shales forming here the base of the coal-measures 
and the reddish layers, which are undoubtedly Waverly and contain 
Chonetes illinoisensis and other characteristic fossils. 
The Waverly layers for some distance below the coal-measures 
are, except in a band about 4 feet from the top, apparently unfossilif- 
erous. About two and one half miles east of Rushville is exposed 
about 20 feet of Waverly, which lies about 70 feet below the top of 
the Chester ( Maxville) and hence, if that series has there its maximum 
development, some 50-60 feet below its base. This exposure is inter- 
esting on account of the presence in it of a Trilobite {Phillip sia mera- 
mecensis) not found in the lower beds of the Waverly and having a 
