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PLATE nVII. 



EnoMPHALCs (Plkuronotus) Decewi. 



Pajtcs 55 and 137. 



Pig. 1. A lateral view into the spiral depression, exhibiting the angular fomi of the apei-ture, as shown 

 where the shell lies upon its base. 



Kg. 2. The umbilical side of the specimen, showing the subquadrate form of the apertui-e as seen from 

 beneath. The shell becomes thickened and lamellose towards the mouth. The suiface- 

 markinps are only partially pi-eserved on a part of the outer volution— th^ i-emainiiig portion 

 of the shell having been covered by a Sti-omatopora. 



Fig. 3. The upper side of the shell, showing the depressed spire. The 8urfat;e-markings ai-e in part pre- 

 served, while much of the anterior portion of the last volution is covered by a Brj'ozoan. The 

 peripheral band is distinctly niai-ked, even where the shell is removed, and the depth of the 

 marginal sinus is shown by the direction of the strise — the aperture being filled with Stroma- 



"' ' topora. '■'- -Ai'i 



Kg. 4. A section across the centre, as illustrated on plate 15 ; the upper part of the figure, a, cutting the 

 volution (of a cast) near the aperture ; 6 showing the form at half a volution preceding ; and e, 

 the form at a single volution from the aperture. 



EroMPHAxus (Straparollus) oltmenioides. 



Page 62. 

 Kg. 5. The upper side of a large specimen,^ preserving a little more than one volution entire, with the 



remaining portion crushed and imperfect. 

 Kg. 6. A smaller specimen, showing a single volution with partial impressions of the remaining volutions. 

 Both the specimens are casts of the interioi-. 



EuoMPHALUs (Straparollus) Hecale var. corpulens. 



See page 59. 

 Kg. 7. The umbilical side of a specimen associated with OrthU Tioga, fi-om the Chemung group. 



EuoMPHALUs TioaA. 



Kg. 8. The umbilical side of a specimen, associated with authentic Chemung fossils at Nichols, Tioga 

 county, N. Y. 



