CEPHALOPODA. 
Goniatites. 
246 
17. Ammonites lacunatus. —The Fretted Ammonites, pi. 
XX.** figs. 8, 9. 
A. lacunatus. Murchison, Geo. Chelt. p. 105, pi. 11, f. 4, 5. 
Discoidal, with four or five half-concealed, slightly compressed 
volutions, crossed by rather close, curved, alternately long and 
short ribs, sometimes anastomosing; back with a single, nar¬ 
row furrow, which is wanting in young specimens; aperture 
small, oblong. 
The Lias Shale, Dowdswell Hill. 
18. Ammonites Boblayei. —Boblaye’sAmmonite, pi.XX.** 
figs. 13, 14. 
A. Boblayei. Murchison, Geo. Chelt. pi. 12, fig. 3. 
Compressed, with five rapidly increasing two-thirds con¬ 
cealed volutions ; deeply umbilicate ; volutions crossed by 
very thick curved ribs, which project considerably beyond the 
dorsal line ; these become more flattened on the outer volutions. 
The Lias Shale, Cheltenham. 
19. Ammonites dissimilis. —The Dissimilar Ammonite, pi. 
XX.* figs. 11, 12, 13. 
Inflated, with rapidly increasing volutions, the smaller ones 
entirely concealed; largely umbilicate; crossed by broad fur¬ 
rows, and flattened curved ribs passing over the thick back, 
with a few elongated nodules on the inner edges of the volu¬ 
tions ; aperture wide and sub-orbicular. 
The Calcareous Grit, Scarborough. 
In the Manchester Museum. 
20. Ammonites calcar. —The Spur Ammonites, pi. XX.* 
fig. 4. 
Discoidal; inner volutions entirely concealed; sides with 
irregular alternately long and short curved ribs, and a central 
series of round tubercles; back with a double keel, consisting 
of close-set sharp tubercles, each series pointing outwards. 
The Lias, Scarborough. 
In the Cabinet of Thomas Allis, Esq., York. 
21. Ammonites rotifer. —The Wheel-like Ammonite, pi. 
XX.* figs. 14, 15. 
Discoidal, with five moderately rounded, smooth volutions, 
which are one-third concealed; a series of close-set ribs pass 
over the rounded back, and reach nearly the middle of the 
volutions on either side, where they are met by wide-set, thick 
ribs, which emanate from the inner margins; aperture nearly 
orbicular. 
The Calcareous Grit, Scarborough. 
In the Manchester Museum. 
22. Ammonites Mulgiuvius. —Mulgrave’s Ammonites, pi. 
XX.* fig. 10. 
A. Mulgravius. Young and Bird, Geo. York. p. 251, pi. 13, 
fig. 8. 
Discoidal; umbilicated; volutions more than half concealed, 
and rapidly increasing; internal sides bevelled inwards, the 
inner edges defined by a perpendicular flat margin ; back nar¬ 
row, with a central smooth, narrow, and low keel; surface 
covered with a series of elegantly falcated furrows, emanating 
from the inner edges in extremely fine lines, which gradually 
increase in width after passing the centre of the volutions. 
The Lias, Lythe, Saltwick. 
23. Ammonites fimbriatus. —The Fringed Ammonites, p. 
28, pi. XX. fig. 12, and pi. XX.* fig. 8. 
Discoidal, with four cylindrical, rapidly enlarging volutions, 
the inner oues entirely exposed; surface with many raised 
transverse and spiral narrow ribs, dividing it into sub- 
quadrangular hollow spaces; the tranverse divisions being all 
curved, and producing a fringed appearance; aperture orbicular, 
provided with an undulating frill. 
The beautiful specimen from which we drew fig. 8, pi. XX.* 
was obtained in the Lias at Whitby, by my friend James Cook, 
Esq., of York, and is in his cabinet. Its diameter is ten inches, 
and the thickness of the outer volution, three and a half inches. 
Genus GONIATITES. —Yon Buck. 
1. Goniatites undueatus. —The Waved Goniatites, pL 
XXI.* figs. 1, 2, 3, 4, 5. 
G. undulatus. Brown, Tr. Man. Geo. Soc. I. p. 213, pi. 7, 
figs. 1, 2, 3, 4, 5. 
Sub-globose, glabrous, and shining; crossed by numerous- 
transverse, irregular, undulating, continuous raised lines, which 
bend downwards as they pass over the ambit; also provided 
with deep, straight, transverse constrictions; ambit rounded; 
umbilicus very small, deep, and angulated ; aperture wide and 
expansive. 
In the very young state this species is destitute of the trans¬ 
verse lines aud constrictions; the umbilicus is large, and ex¬ 
hibits the volutions. Diameter nine lines, thickness a third 
less. 
This beautiful species occurs in fragments at Lamberts 
Clough, near Todmorden, and at Crossbills, near Skipton, 
Yorkshire. The distinct and bold undulating lines distinguish 
this from all its congeners. 
2. Goniatites intermedius. —The Intermediate Goniatites, 
pi. XXL* figs. 0, 7. 
G . intermedius. Brown, Tr. Man. Geo. Soc. I. p. 213, pi. 7, 
figs. 0, 7. 
Shell discoidal, sub-compressed; crossed by indistinct, wide- 
set, continuous, doubly-bent, undulations, which dip rapidly in 
an arcuated manner as they pass over the sub-earinated ambit,, 
which is a little compressed; constrictions regular, broad, 
shallow, and greatly arcuated ou the sides, and in passing over 
the ambit; volutions three, aud rapidly increasing; umbilicus 
large and deep, with raised angular edges, and exhibiting the 
three volutions. Septa, the dorsal lobes single, sole-shaped T 
with a truncated point; a single, pointed lateral sinus, and two- 
