Goniatites. 
MOLLUSCA. 
31 
sides bending somewhat abruptly towards the body ; septa 
delicately marked and waved on the edge; with a short 
dorsal lobe, and the dorsal sinuses acute ; first lateral lobe 
considerably rounded. 
Found at Black Hall, Bolland, Queen's County, Ireland. 
27- G. BiDO rsalis. — The Double Backed Goniatite, 
pi. XXI. fig. f)3, 54. 
Goniatites bidorsalts. Phillips, Geology of Yorkshire, II. 
p. 235, pi. 20, fig. 2, 3, 4. 
Subglobose, umbilicate ; inner volutions entirely concealed ; 
sides rounded, with transverse, sigmoidal, sharp ribs, which 
curve elegantly backwards before passing over the rounded 
ambit, and having fine spiral, distant striae ; umbilicus large, 
the lateral lobes and sinus rounded, with a double dorsal 
lobe, each part divided. 
This species m$y be confounded with the young of 
Goniatites variables , but the different form of its septa dis¬ 
tinguishes it from that species. 
• Found in Shale, at Woodford. 
28. G. mutabilis. — The Mutable Goniatite, pi. XXI. 
fig. 55, 56. 
Goniatites mutabilis . Phillips, Geology of Yorkshire, II. 
p. 236, pi. 20, fig. 24, 25, 26. 
Subglobose, umbilicate ; inner volutions entirely concealed; 
sides and ambit much rounded, and smooth with direct 
constrictions ; aperture transverse, semilunar ; umbilicus large, 
with an acute margin ; first lateral lobe narrow. 
The young shell is discoideo-cylindrical, very smooth 
and shining; umbilicus wide and acute, exhibiting the sides 
of all the inner volutions, four in number; aperture trans¬ 
verse, widest and pointed next the ambit, and the constric¬ 
tions direct. 
Locality unknown. 
29. G. implicatus. —The Involved Goniatite, pi. XXI. 
fig. 58. 
Goniatites implicatus . Phillips, Geology of Yorkshire, II. 
p. 235, pi. 19, fig. 24, 25. 
Subglobose, umbilicate ; inner volutions entirely concealed ; 
sides a little flattened, with delicate transverse striae ; umbi¬ 
licus rather small, septa numerous, with their edges but 
moderately waved ; first lateral lobes widely rounded, with 
their dorsal margins parallel; and having a very small dorsal 
lobe, with rounded dorsal sinuses. 
Found at Black Hall, Bolland, Queen's County, Ireland. 
30. G. platylobus. —The Wide Lobed Goniatite, pi. 
XXI. fig. 59. 
Goniatites platylobus. Phillips, Geology of Yorkshire, II. 
p. 235, pi. XX. fig. 5, 6. 
Subglobose, umbilicate ; inner volutions wholly concealed ; 
sides and ambit rounded, with obsolete spiral stria?, and 
crossed by direct constrictions ; umbilicus of moderate size, 
crenate at its margin ; having rounded sutural lobes and 
sinuses, and a wide dorsal lobe. 
Found at Bolland, Queen’s County, Ireland. 
31. G. calyx. —The Calyx Goniatite, pi. XXI. fig. 60, 
61. 
Goniatites calyx. Phillips, Geology of Yorkshire, II. p. 
236, pi. 20, fig. 22, 23. 
Discoideo-cylindrical, umbilicate; with about five volu¬ 
tions, which are entirely enveloped in the body or outer one ; 
ambit nearly flattened, glabrous, with dedicate transverse striae ; 
umbilicus very wide and acute, and deep, exposing within it 
the margins of the volutions; and frequently crenate at the 
edges ; aperture subl uni form, flat, transverse, and acute at 
the outer angles ; constrictions direct, having round septal 
undulations ; the dorsal lobe and sinuses forming a waved 
transverse line. 
This is the young condition of the fossil; the adult is not 
known. 
Found at Iligh-Green Wood, Black Hall, and Kulkeagh. 
Genus VI.—SC A P HIT ES.— Parkinson. 
Shell chambered, involute ; its first volutions small, 
and increasing very gradually, its last elongated and 
dilated or expanded, and then diminishing and inflated; 
the divisions of the chambers lobed and sinuous. It 
appears to be almost, if not wholly, internal. 
1. S. striatus. —The Striated Scaphite, pi. XXII. fig. 1, 
2, 3. 
Scaphites striatus. Man tell, Geology of Sussex, p. 119, 
pi. 22, fig. 3, 4, 9, 11, 13, 14, 15 and 16. De la Bcche, 
Geo. Manuel, p. 293. Fleming, Brit. An. p. 249. 
Inner volutions umbilicate, deeply inserted, and wholly 
concealed by the outer volution; ambit or back tumid, 
suddenly enlarged, and the reflected turn terminating before 
reaching the centre ; aperture entire, of an irregular trans¬ 
versely ovate form and marginate ; margin prominent, and 
upper part produced, extending a little over the spire ; whole 
surface covered with numerous oblique, annular, bifurcate 
striae, which arise singly from the inner margin, divide into 
two or three before passing over the ambit, and unite with 
those which correspond on the opposite side ; inner half of 
the outer volution somewhat depressed, and from thence the 
stria? extend obliquely in a radiating manner, and become 
bifurcate at the edge of the depression ; towards the aper¬ 
ture the strife are larger and more distinct, septa slightly 
concave, with three principal indentations on their edges, 
and with several minute sinuosities. Situation of the 
siphuncle unknown, but it seems to have been on the 
internal margin. Length about an inch, greatest thickness 
one-fourth, and its width an eighth of an inch. 
Found in the Gray Chalk Marie at Hamsey, Ranscombc, 
Rodmill, and Brighton. 
2. S. costatus. — The Ribbed Scaphite, pi. XXII. fig. 4 , 
5. 
Scaphites costatus. Mantell, Geology of Sussex, p. 120, 
pi. 20, fig. 8 and 12. Fleming, Brit. An. p. 241. De la 
Beche, Geo. Manuel, p. 293. 
Volutions convex, laterally compressed ; inner volutions 
wholly inserted and concealed; sides with numerous trans¬ 
verse furcate striae, which embrace the ambit; sides of the 
outer volutions smooth, and provided with eight or ten 
distant oblique nodular projections ; ambit broad, convex. 
Length one inch ; width an eighth of an inch ; thickness of 
the ambit a sixth of ail inch. 
This species is not so delicate as S. striatus , and is dis¬ 
tinguished from it by the nodular projections on the sides of 
the outer volutions; these proceed from the centre, and 
diverge into numerous stria? and encircle the ambit, which 
is broad, and the projecting terminations of the stria? pro- 
