593 
_ The following section of the beds is given by Mr. Pearce :— 
ARAM ual soil 25 eI, HT BO PES OD deat: 
MG rave SII SESE OOO RL PISS 8 — 
3. Four or five bands of laminated clay, al- 
ternating with sandy clay, almost en- 
tirely composed of broken shells.... 6 — 
4. Clay, containing Gryphea bilobata. 
The objects of the author are, first to draw attention to the organic 
bodies discovered in the laminated clay; and secondly, to describe 
the various forms which the mouth of the Ammonite assumes in dif- 
ferent species and in different stages of growth in the same species. 
The fossils obtained from the laminated clay are stated to be as 
follows:—1. A succulent plant. 2. Lignite, with oysters sometimes 
affixed to it. 3. Crustaceans, supposed to have inhabited the dead 
shell of the Ammonite*. The specimen described is stated to have a 
finely tuberculated and delicately thin covering; the tail to have 
the appearance of being divided into three portions, finely corrugated 
towards their edges; the body to have on each side internally five 
or more processes; and the head to be furnished with several short 
arms and two long ones jointed a little above the head and ter- 
minated in two claws, the longer being serrated on its inner edge. 
4. Another allied crustacean is stated to have also an extremely thin 
and finely tuberculated covering ; to be furnished with two long arms 
of similar shape, each terminated at its extremity by one claw, and 
two others projecting from about the centre, and passing off poste- 
riorly are two fan-like processes of similar shape. 5. Trigonellites, 
two species. 6. One valve of a Pollicipes. 7. The remains of an 
animal considered to have been probably allied to aSepia. 8. Shells 
of the genera Unio, Cyclas, Astarte, Avicula, Gervilla, Pinna, Nu- 
cula, Rostellaria, Turritella, Ammonites +, Belemnites, and an animal 
to which he has applied (since the paper was read) the name of Be- 
lemnotheutis. In describing the last fossil, he states that the lower 
part is conical, blunt at the apex, and chambered internally like the 
alveolus of a Belemnite, with an oval siphunculus near the edge of 
the chambers; that it has a brown thick shelly covering which gra- 
dually becomes thinner towards the superior part; that immediately 
above the chambers is an ink-bag resting on what resembles the 
upper part of a sepiostaire, and composed of a yellow substance 
finely striated transversely, being formed of laminz of unequal den- 
sity; that in some specimens, broken longitudinally through the 
middle, are exposed long, flat, narrow processes of a different struc- 
ture ; that immediately beneath the superior contraction are two 
long feather-like processes, and one or more which are short, indica- 
* To this organic body Mr. Pearce has given since the paper was read 
the name of Ammonicolax. 
+ Since the paper was written Mr. Pearce has consulted Mr. Pratt’s ac- 
count in the Magazine of Natural History for November 1841, of Oxford 
clay Ammonites, and ascertained that he possesses[ 4. Lonsdalii, A. Brightix], 
[A. Gulielmi, A. Elizabethee], A. Comptoni, and A. Konigz. The fossils 
included between brackets the author considers to belong to one species. 
