110 
ORGANIC REMAINS. 
Ammonites. — 4. Vernoni (Bean) ... PI. V. fig. 19. Ditto, and Ebberston. 
5. athleta ... ... PI. VI. fig. 19. Scarborough. 
6. a large imperfect species Ditto. 
ANNULOSA, CEUSTACEA, AND FISHES. 
Serpula. — 1. intestinalis ... ... PI. V. fig. 21. Scarborough, and in the 
cornbrash. 
2. a tapering unattached hook-formed species, -v 
with four longitudinal furrows, having 1 Scarborough, (my collection.) 
some analogy to Smith’s figs. 5, 6. J 
Astacus (a didactyle claw) ... fig. 20. Scarborough. 
Tooth of squalus ... ... fig. 22. Ditto. 
The gray shale of Scarborough castle-hill, which represents the 
Oxford clay of the south of England, belongs to the same great forma- 
tion as the calcareous grit and the Kelloways rock, and, being situated 
between them, contains several fossils which are also found in one or 
other of those rocks. It appears to me that mya literata, sanguinolaria 
undulata, and crassina carinata, are found in all these strata, and perhaps 
in some others. I am not positive that the shell named ammonites ver- 
tebralis is really identical with that in the calcareous grit ; but there can 
be no doubt that a. athleta is repeated in the Kelloways rock. A con- 
siderable number of fossils remain, which have not yet been discovered 
in any other stratum : but as these have, for the most part, been found in 
only one locality at the bottom of the stratum, we must wait, I think, 
for further discoveries, before pronouncing how far they are to be con- 
sidered characteristic. Judging from very limited experience, I am dis- 
posed to think ammonites Vernoni, belemnites gracilis, and patella latis- 
sima, most likely to be useful in this respect. This clay is so intimately 
connected with the subjacent Kelloways rock in Yorkshire, as well as 
in the south of England, that we might almost adopt the language of 
Mr. Smith, who says, (Strata identified, page 22,) “ In several instances 
where the bottom of the clay contains the same fossils as the rock which 
it covers, it is difficult to say to which stratum they belong.” At Dun- 
lobin in Sutherland, Mr. Murchison collected fossils which, from their 
agreement with those contained in the above catalogue, seem fully to 
