PLATE III. 
1. Hamites Gibbosus. ( Bulging Hamite.) Gibbose; with prominent, oblique annulations ; 
descending from outer surface and spreading out into flattened, continuous plate behind; back 
much depressed; front rounded. Shortest diagonal from back to front. 
2. H. Intermedius. ( Intermediate Hamite.) Compressed; with continuous, oblique, pro¬ 
truding annulations, somewhat flattened, thickest on outer surface, and descending from internal 
side. 
3. H. Spinulosus. ( Prickly Hamite.) Compressed, with gradual curvature; with equally 
prominent, regular undulations, nearly obsolete on narrow back; each alternate one with two sharp 
spines on each side near front; aperture elliptical. 
7. H. Compressus. (Compressed Hamite.) Compressed; with oblique, sharp, regular, 
slightly undulating annulations, thickest and most prominent behind; thicker end oval. Breadth 
two-thirds its length. 
4. 9. Turrilites Undulata. (Waved Turrilite.) Whorls reversed; with numerous, prominent, 
equidistant, undulating, oblique, longitudinal ribs. Often 3 in. in diameter. 
5. T. Tuberculata. (Tuberculated Turrilite.) Whorls reversed; centre of whorls with single 
row of fifteen or sixteen large tubercles; those on body elongated, forming irregular, tubercular 
costa?, with three bands of small cuts at base ; whorls much inflated and deeply divided by undulating 
suture; sipliuncle immediately between larger tubercles and upper edge of whorls ; base of aperture 
contracted. A specimen estimated to have measured upwards of two feet. 
6. T. Obliqua. (Oblique Turrilite.) Whorls dextral; deeply divided; upper portions narrow 
and abruptly widening towards base; base of each, with oblique, elliptical tubercles, giving whorls 
angular appearance, suture well marked. 
8. T. Bergeri. (Berger's Turrilite.) Whorls of spire turreted, deeply divided, flattened above ; 
with longitudinal, oblong, ovate, continuous rows of tubercles having a somewhat catenated appear¬ 
ance ; upper whorls with three, next with five series ; sipliuncle apparent near upper or dorsal mar¬ 
gins of two whorls; sinuous edges of transverse plates visible in central whorl; entire surface of a 
transverse plate laid open on smaller end of third whorl, showing lobes and saddles to be analogous to 
same parts in Ammonites. 
10. T. Costata. (Bibbed Turrilite.) Whorls reversed; upper half of whorls with about twenty 
smooth, rounded, prominent, equidistant, subulate ribs, reaching to centre of whorls, with zone of 
prominent, slightly elliptical tubercles beneath; in many instances tubercles and ribs pass into each 
other. Length from 3 to 6 in. 
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