INTRODUCTION. 
The following species are given by Messrs. Tate and Blake in the first part of their work 
on the Yorkshire Lias ; but as there is no notice taken of them in the second or palaeonto- 
logical part, we have not included them in our catalogue : 
A 
3 
Doubtful Species 
mentioned in the 
Yorkshire Lias. Part I. ! 
1 
1 
2 
c 
angulatus. 
Bucklandi. 
. oxynotus. 
, arinatus. 
, Jamesom. 
. capricornu 
. rcargaritat 
, spinatus. 
1 
3 
3 
3 
S 
3 
1 
communis. 
, jurensis. 
References to 
the Yorkshire 
Lias, Part I. 
Supposed Substitutions 
in Part II. 
| 






3 





' 
1 
H 
Rhynchonella subserrata 
T 
pp. 102, 230 - 
Rh. subconcinna. 
Lima galathea 
p. 172 
Limea acuticosta. 
T 
Ostrea lageniformis 
T 
p. 88 - 
Ostrea Goldfussii or 
O. sportella. 
Pecten Hehlii 
T 
p. 86. 
Area Stricklandi - 
T 
T 
p. 88 - 
Macrodon intermedius. 
Arcomya petrsea - 
T 
p. 154 - 
Arcomya longa. 
Ceromya infraliassica 
T 
pp. 43, 45. 
Macrodon liasinus 
T 
p. 154 . 
Macrodon intermedius. 
Modiola Simpsoni 
, 
p. 180 
Inoceramus. 
Nucula subglobosa 
T 
p. 172 - 
Nucula cordata. 
Pholadomya costata 
T 
p. 131 - 
Pleuromya costata or Phola 
domya Simpsoni. 
Pleuromya concinna 
T 
p. 116 - 
Pleuromya mundula. 
punctata 
I 
p. 87 - 
Gresslya. 
rostrata 
T 
pp. 126, 154 - 
Pleuromya costata. 
Tancredia dubia - 
T 
p. 180 - 
Tancredia dionvillensis. 
Unicardium janthe 
T 
p. 130 
Unicardium subglobosum. 
Cerithium camertonensis 
T 
p. 87. 
Cerithium tenuicostatum 
T 
p. 44. 
Chemnitzia etalense 
T 
p. 52. 
ilminstrensis 
T 
p. 116 TS- 
Chernnitzia semitecta. 
Hytirobia Krausseana 
T 
p.45 - 
Turbo tenuis. 
Pitonillus turbinatus 
T 
T 
pp. 154, 155, 172 
Turbo aciculus. 
Turbo bullatus 
T 
p. 154 - 
Turbo latilabrus. 
littorinaeformis 
T 
p. 87. 
I 
Turritella crassilabrata - 
T 
p. 71. 
Ammonites erratus 
T 
p. 180, see also 
Am. exaratus. 
p. 311 in 
Part II. 

serridens 
T 
p. 190 - 
Am. jurensis 
Pachycormus latipennis - 
p. 180 - 
Pachycormus latirostris. 
The following doubtful forms are also noted by the above-named authors : 
Onychites numismalis, 
Quenst., Jura, pi. 
XXIV., f. 59 ; T. & B., 
p. 448. 
" Crinoid arms " ? T. & B., 
p. 448, pi. XVII., f. 45 
non40. 
Brown horny teeth or 
nooks," T. & B., p. 448, 
pi. XVII., f. 41. 
Occurs at Peak. 
Abundant among the Microzoa. 
Occur in the lower beds. 
