PLATE XIV. 
1. Ammonites Tuberculatus. ( Tuberculated Ammonite.) Compressed, umbilicate, with five 
convex volutions, inner ones two-thirds exposed; ambit flat; transversely ribbed; cost® oblong, 
arising in threes from large, circular tubercles, uniting in pairs towards back, and forming large, 
compressed tubercles on each side of broad ambit, with deep, narfow sulcus or groove in centre; 
aperture sub-orbicular; septa very foliaceous. 
2. A. Stokesii. ( Stokes' Ammonite.) Lenticular, depressed; inner edge of volutions strongly 
defined; crossed by many, slightly elevated ribs; inner volutions half concealed; ambit thin, 
crenulated; whole shell with marks of concentric striae; aperture sagittate. 
3. A. Proboseidens. ( Proboscis Ammonite.) Depressed, with four or five ventricose, partly 
concealed volutions; outer one with two rows of large, remote, blunted, cylindrical tubercles; ambit 
concave; aperture orbicular, being in width about one-third diameter of shell. 
4. A. DentatllS. ( Toothed Ammonite.) Discoidal, umbilicated, with many prominent, slightly 
curved ribs, furcated near their origin and ending upon margin of ambit, producing on each side of 
back a serrated margin with plain, flat, intermediate space; aperture two-fifths of diameter of shell 
long, and one-fourth wide. 
5. A. Hystrix. ( Hedgehoy Ammonite.) Discoidal, volutions somewhat inflated, with transverse, 
elevated ribs from inner margin, which is well defined and terminating on ambit; each rib with three 
series of tubercles, apparently elevated, subulate, sharp-pointed; those on inner margin one quarter 
of inch long; central series obtuse, as if worn down; dorsal ones entire, nearly half an inch long, 
curved forward. 
6. 7. A. Woolgari. ( Wool gar s Ammonite.) Discoidal, depressed, carinated; with three or four 
volutions, central ones one-third inserted; sides of central volutions compressed, with remote, slightly 
curved ribs, terminating on outer margin in compressed, carinated tubercles ; keel acute, serrated. 
In some specimens two tubercles on outer extremity of each rib and one on inner margin. 
8. A. Biplicatus. ( Two-plaited Ammonite.) Compressed, carinated, slightly umbilicate, with 
three or four volutions, central ones two-thirds concealed ; crossed by transverse, prominent, curved, 
bifurcated ribs, emanating from a series of oblong, tubercular prominences, situate on inner margins 
of volutions, and ending in distinct tubercles on outer margin; keel depressed,bordered by alternating, 
depressed tubercles; aperture obtusely sagittate; in length somewhat less than diameter of shell. 
9. A. Birchii. ( Birch's Ammonite.) Discoidal, with six to eight wholly exposed, gradually 
increasing volutions; sides concave, each volution, with about thirty pairs of thin, obtuse tubercles, 
each pair united by a slightly elevated rib ; back rounded, with obscure sulci; aperture transverse. 
Greatest diameter, 7\ in. 
10. A. Goodhalli. (Goodhall’s Ammonite.) Discoidal, carinated; with five ribbed volutions, 
inner ones one-third inserted; both edges of volutions gradually rounded; sides nearly flat, with 
large, broad, undulated, irregular, rather flat ribs, with tubercles at outer end only; keel thin, very 
prominent; aperture oblong, slightly compressed in centre. 
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