PLATE LVII. 
GOMPHOCERAS ? PLANUM. 
Page 352. 
Fig-. 1. The ventral side of a fragment of the species, carrying seven air-chambers and the base of the 
chamber of habitation. 
Fig. 2. The convex side of a septum, showing the size and position of the siphuncle. Borodino, Skaneateles 
lake, IV. Y. 
Nautilus liratus. 
Page 407. 
See Plate 60. 
Fig. 3. A lateral view of a partially compressed specimen, which is a cast of the interior, preserving only 
strong, revolving plications, of which there are nine on the lateral face of the chamber of 
habitation. Hamilton group. Quarries north of Sherburne, Chenango county, N. Y. 
Nautilus subliratus. 
Page 409. 
Fig. 4. A dorso-lateral view of a fragment, which preserves the greater part of the chamber of habitation 
and four of the attached air-chambers. The specimen is a cast of the interior, obliquely com¬ 
pressed, showing one-half of the dorsal side and a portion of the lateral face, and preserving 
five revolving plications. 
Fig. 6. The ventral side of the grand chamber, with a few attached air-chambers. The central space is 
concave and essentially smooth, while on each side there are six revolving, angular plications. 
The transverse strife are partially preserved. 
Fig. 7. The ventral side of the preceding specimen, which preserves the evidence of several air-chambers 
at the base, the surface being marked by fine, sharply impressed, longitudinal strise, which are 
cancellated by finer transverse strise; but without any indication of the revolving ridges or 
plications. Earloille, Madison county, 2V. Y. 
Fig. 5. A fragment of the chambered portion of a Nautilus, which is referred with doubt to this species. 
It is much larger than the chambered portion of any other individual which has been 
observed. The radiating plications which are so well defined in this specimen are barely 
perceptible, or obsolescent on the smaller individuals referred to this species. Hamilton group. 
Basin Grulf, Skaneateles lake, IV. Y. 
