Jrom the Neighbourhood of Edinburgh. 261 
tooth, so as to present an appearance almost as if a little extin- 
guisher had been stuck on to the point. Below this, which is 
quite smooth, the polished surface is ornamented with fine strie, 
more marked in some specimens than in others, and which con- 
sist, in fact, of very delicate linear depressions, often interrupted 
and wavy. ‘These are best marked just below the enamel cap, 
and become lost towards the base of the tooth, which is dull 
and smooth. Microscopically the teeth display a structure 
quite similar to that described by Agassiz in Pygopterus, and 
by Messrs. Hancock and Atthey in Palwoniscus Egertoni. 
The pulp-cavity is simple and wide at the base, becoming 
attenuated upwards into the body of the tooth; the dentine 
displays the same arrangement of radiating tubules, and is 
crowned above by acap of structureless “ enamel,” which also 
sends down a very thin and delicate layer over the whole ex- 
ternal surface. I formerly described the teeth as quite smooth ; 
and so they seemed to be in the specimen then at my disposal. 
The apparent absence of the striz in these Wardie specimens, 
however, is evidently due to flaking-off of the external enamel 
film above mentioned, the surface being at the same time left 
rather dull ; and I have since seen specimens from that locality 
in which the external polished surface still remains, and 
which show the very same strie as those seen in specimens 
from other localities, preserved in a softer matrix. 
The maxillary bone, represented in Pl. XVI. fig. 7, is from 
Shawfair, and, though undoubtedly belonging to the same 
species, is proportionally shorter and broader than is usually 
the case. Ihave another from Loanhead, which shows the 
same peculiarity. Neither of these belonged to full-grown fish, 
in which the maxillary often attains a length of 2? inches by 
1 inch in breadth posteriorly. The teeth are of different sizes ; 
the larger ones, measuring in ordinary specimens from + to 3 
inch in length, are arranged in a row at somewhat irregular 
intervals ; and occupying a more external position on the edge 
of the jaw is a line of smaller teeth, whose length varies from 
about ;!; to 3 inch. Certain specimens from Shawfair and 
Woolmet appear to have undergone much pressure, the bones 
and scales being very thin, though retaining their markings as 
distinctly as ever, and the teeth being considerably flattened, 
especially at their bases, as might have been expected. In 
these instances, however, the enamel cap remains unaffected, 
standing out all the more distinctly, while the striae on the 
body of the tooth are also more strongly marked. These 
appearances are, I think, certainly due to changes occurring 
during fossilization, and not to specific difference. 
