250 
CEPHALOPODA. 
Phragmoceras. 
With about three rather compressed volutions, the inner 
ones slightly indenting those around them; surface with 
numerous transverse arcuated ribs, which are lost over the mar¬ 
gin ; aperture somewhat quadrangular, with rounded corners; 
siphuncle nearly central. Diameter of last volution four and 
a half inches, length of aperture one inch and three-fourths, 
width eight lines. 
Fig. 3 represents a portion of the back, and fig. 2 a section. 
The Wenlock Limestone, Mocktree Hays, and Churn Bank, 
near Ludlow. 
1. Nummulites elegans. —The Elegant Nummulites, pi. 
XXVI. figs. 9, 10, 11. 
N. elegans. Sowerby, VI. p. 76, pi. 538, fig. 2. 
Greatly compressed, smooth, consisting of about six volu¬ 
tions; septa numerous, and gently curved from the axis; aper¬ 
ture rather prominent. 
This species differs from N. Icevigata in being smaller and 
having fewer volutions, which increase more rapidly, and in the 
regular curvature of the septa. In the young condition it is 
very smooth and lenticular. 
In the London Clay, Emsworth, Sussex. 
1. Cyrtoceras Nautiloidegm.— The Nautilus-shaped Cyr- 
toceras, pi. III.* figs. 7, 8, 9. 
C. Nautiloideiim. Phillips, Pal. Fos. p. 116, pi. 46, fig. 200. 
Involute, tapering; section nearly circular; septa slightly 
oblique ; siphuncle situate near the back, almost half way from 
the centre toward the convex line of the shell. 
Fig. 8, a chamber of C. marginals, seen on the face; fig. 9, 
ditto on the edge. 
In the Devonian Shales, Newton Bushel. 
1. Crioceras Bowerbankii. —Bowerbank's Crioceras, pi. 
III.* figs. 12, 13. 
C. Bowerbankii. Sowerby, Geo. Tr. 2nd Ser. V. p. 410, 
pi. 34, fig. 1. 
With four volutions, slightly flattened on the sides, and 
nearly close ; the inner ones with numerous radiating furrows, 
which, gradually disappearing upon the outer volution, are 
succeeded by eight or ten thick, arcuated ribs, extending across 
the volution, and are largest and most elevated towards the 
aperture, which is thinly edged and transversely oblong. 
Diameter seven and a half inches; breadth of aperture two 
and a half inches. 
In the Lower Greensand, Isle of Wight. 
1 . Clymenia linearis. —The Lined Clymenia, pi. III.* 
figs. 4, 5. 
C. linearis. Sowerby, Geo. Tr. 2nd. Ser. V. pi. 54, fig. 19. 
Endosiphonites carinatus. Ansted, Camb. Tr. VI. pi. 8, figs. 
1, 2, 3. 
Discoidal, convolute, the inner volutions; back with a smooth, 
narrow, central keel; section of the volution elliptical, oblong, 
impressed by the inner volution; siphuncle small; surface 
covered with gently bent transverse striae ; septa obsolete. 
In the Devonian Shales, Petherwin. 
1. Actinoceras Simmsii. —Simm’s Actinoceras, pi. III.* 
fig. 6. 
A. Simmsii. Stokes, Geo. Tr. 2nd Ser. V. p. 708, pi. 59, 
fig. 4. 
Shell large, conical, the upper chamber very deep ; siphuncle 
large, continuous, and contracted at the attachments; septa 
composed of several laminae, and rather thick. Length upwards 
of two feet. 
In the Carboniferous Limestone, Castle Espie, Ireland. 
1. Gomphoceras pyriforme. —The Pear-shaped Gornpho- 
ceras, pi. III.* fig. 10. 
Ortlioceras pyriforme. Sowerby, Sil. Syst. p. 620, pi. 8, 
figs. 19, 20. 
Ovate, pear-shaped, with chambered portion elongated; septa 
numerous, and even ; siphuncle rather large, situate half way 
between the centre and margin, and inflated between the 
septa; aperture narrow, enlarged at one extremity where the 
ridge is reflected; surface smooth. Length of inflated portion 
four inches, diameter of ditto two and a half inches. 
The Upper Silurian Series, Aymstrey, Ledbury, &c. 
1. Phragmoceras ventricosum. —The Bellied Phragmo¬ 
ceras, pi. III.* fig. 11. 
P. ventricosum . Sowerby, Sil. Sys. p. 621, pi. 10, f. 4, 5,6. 
Compressed, slightly arcuated, and somewhat hooked near 
the apex; aperture nearly closed in the middle; beak produced; 
surface with many ridges, which cross the edges of the 
numerous septa. 
The Lower Ludlow Ptock, Aymestry, Dudley, &c 
1. Voluta CiTHARA. —The Harp Voluta, pi. XXXVII. 
figs. 1, 2. 
