PLATE CIX. 
Nautilus bucinum. 
Page 412. 
See Plates 60, 106, 107. 
Fig. 1. A ventral view of the grand chamber of a young shell, preserving the surface ornamentation in a 
remarkable degree of perfection. The sharp, elevated, revolving striae, with finer intermediate 
transverse striae, are precisely of the character of those on the surface of the specimen of this 
species from the Goniatite limestone, plate 60, figs. 1-3. 
This surface-marking resembles that of the specimen referred to JY. liratus, var. juvenis, 
figs. 5 and 6, pi. 56, but the revolving striae are more closely arranged and less conspicuous on 
the concave side, while the tube is free from any transverse undulations which mark that 
variety. West shore of Canandaigua lake, N. Y. 
Fig. 2. A fragment preserving the chamber of habitation nearly entire and two attached air-chambers. The 
surface is marked by the undulating striae of growth and very fine revolving striae. On the 
concave side of the specimen the revolving striae are about one mm. distant from each other; 
and on the convex side there are stronger striae of about the same or a greater distance apart, 
between which are finer striae. From the arenaceous shales of the Hamilton group. Near 
Cazenovia, N. Y. 
Fig.'6. An enlargement from the dorso-lateral surface of a specimen of this species, showing the distant 
revolving striae and the finer concentric striae. From the dark colored shales. Shore of Cayuga 
Lake, lY. Y. 
Nautilus acbjeus. 
Page 417. 
Fig. 3. The ventral side of the chamber of habitation, showing the form (which is slightly compressed), and 
the fine equal striae of the surface. 
Fig. 4. The concave dorsal side, showing the form of the transverse section, the position of the siphuncle, 
and the fine surface-markings. There is a slight indentation near the upper fractured edge of 
the shell, which has apparently been produced by the contact of the inner volution. 
Fig. 5. An enlargement of the surface, showing the fine, nearly equal striae, of which there are from twelve 
to fifteen in the space of five mm. In the arenaceous shales of the Hamilton group. Plainfield, 
Otsego county, N. Y. 
GrONIATITES VANUXEMI. 
Page 434. 
See Plates 66, 67, 68, 69, 74, 109. 
Fig. 7. A transverse section of the disc, showing the form of the inner volutions, their gradually increasing 
dorso-ventral diameter, and final form in the grand chamber near the aperture. 
Fig. 8. A portion of the periphery of a large individual of the species, showing the deep sinuosity in the 
striae, and their great thickness and imbricating character upon the angles of. the periphery. 
From the Goniatite limestone. Manlius, N. Y. 
Nautilus (Discites) Marcellensis. 
Page 428. 
See Plate 65. 
Fig. 9. A small individual of this species, which is principally a cast of the interior, preserving the shell 
upon a part of the grand chamber, which should have been represented as broken along the 
peripheral angle. Manlius, N. Y. 
