SHEPPARD : MARTIN SIMPSON AND HIS GEOLOGICAL MEMOIRS 305 
Simpson also gratefully acknowledges the honour done to him by 
the Council of the London Geological Society in awarding him a portion 
of the Murchison Donation Fund [i.e. in 1884]. 
After the Preface follows the account of " A section of the Yorkshiic 
Lias." The Fossils are then described in the following order : — 
Teleosauriis 
o 
L 
species 
Trigonia , . 
Q 
. . O 
species 
Plesiosaurus 
y 
jj'iytiius . . 
Ichthyosaurus 
D 
Isocardia 
Q 
. . O 
Placoideis . . 
5 
Cardinia . . 
g 
1 5^ T*ri in m 
V- <X1 ^Xl LIXIX • . 
9 
Sauroides 
11 
Tellina . . 
. 14 
>5 
Sepia , . 
O 
Venus 
5 
Belemnites 
Corbula . . 
4 
J> 
Nautilus 
6 
Myacites 
. 32 
5 > 
Ammonites 
200 
^lya 
7 
Trochus 
26 
? J 
Pholadomya 
. 17 
Turbo . . 
45 
Lingula . . 
2 
Nerita . . 
o 
Terebratula 
. 16 
Tornatella 
6 
J 5 
Spirifer . . 
7 
5> 
Buccinum 
1 
J » 
Orbicula . . 
2 
J> 
Cerithium 
9 
J 5 
Serpula . . 
8 
Ostrea , . 
17 
Dentalium 
6 
> ? 
Peeten 
25 
5 » 
Astacus . . 
4 
description of every bed of the Lias, with their respective thicknesses, 
and the included fossils. In some parts it fairly represents the truth, 
but in others it is not possible to follow it at all on the spot, and, as 
portions of the series appear to be omitted, gives no true idea of the total 
thickness."' Also (on p. 270), In 1843, Simpson published ' A Mono- 
graph of the Ammonites of the Yorkshire Lias,' without any figures — 
in this he enumerated 108 species, of which 50 were supposed to be new. 
Many of his names, however, both original and adopted, were afterwards 
superseded in 1855 by his ' Fossils of the Yorkshire Lias,' in w^hich 191 
names were applied, which included all those that had before been used. 
Three of these are applied to non-liassic shells by mistake, but I cannot 
agree with the author in considering all the remainder as sufficiently 
distinct from each other to deserve a specific name, while some are in 
my [i.e. J. F. Blake's] opinion the young of others, and some are described 
from insufficient material. After all such deductions w^e find the total 
number raised to 89, of which 64 go under other names than Simpson's, 
and 5 are adopted on his authority alone as I have not seen them." 
Blake names some of the Liassic fossils after Simpson. In Tate and 
Blake's list of important w^orks on the Lias (pp. 5-11), no reference what- 
ever is made to Simpson's book on the Ammonites. 
* Also 3 species from beds between the Lias and the Oolite : Blea- 
wyke, Peak. 
f Misprinted Mylilus, on p. 193. 
