.ivmvwiu diJxd'l 



PLATE XXIL 



TcBBo Shumardii. 



Page 135. 

 Vig. 1. A small specimen showing' the ftperttir*, wi'tli the ptefistbin* very nearly entire, while the thickened 



columellar lip is completely pi-eserved. 

 Fig. 2. The opposite side of the same specimen, showing the oblique nodes and the angulai- peripheral 



carina. 

 Pig. 3. Doi-sal view of a large individual, showing the elevation of the spire, and the strong oblique nodes, 



which, in some instances, inva*le the i)ei'ij)heral cariua, giving- an undulating outline. 

 Fig. 4. Tlie summit of the pi-ecediug^ specimen, ^ojpig the volutions and the form and character of the 



nodes. ,_,f i,.M-i«i„ ■. .-.f...« -..ll -iMivi.rf .ir.,it'i('>/ •t-.tn-. ! :.r^.-r ifth? rn,..;■..,^, i:,',,. / ;.r „;.| 



Naticopsis comperta, n. sp. 



Pig. 6. The posterior side showing- the apertui-e, with the peristMne neai-ly entii-e. 



Pig. 6. The anterior side of the pi-eceding shell. The specimen is from the Upper Helderberg limestone, 

 and enlarged to two diameters. 



EUOMPHALUS [PliiURONOTUS] DeCEWI. 



Vage» 66 and i:i7. 



,Fig 7. T\\f upper side of the spii-e of a specimen of medium size. The shell is coai-sely striated, and, 



1 with the peripheral band, well preserved on the outer volution. From the Upper Kelderberg 



limestone of Ohio. Collection of Dr. J. S. Nbwberet. 



Plattceras dumostjm. 



' r<< I'l^ 1 Page U. 



Fig. 8. A very coarse, sti-ong specimen, mainly an interior cast, preserving a few strong spines. The 

 specimen is from the Schoharie giit at Schoharie— a position in which this fossil is rai-ely found. 



