360 Messrs. Hancock & Atthey on Leptile- and Fish-Remains 
row is complete, these large teeth being frequently broken off. 
Nevertheless in several of our specimens they can be observed 
arranged at pretty regular intervals, evincing that the series, 
as far as it extends, is complete. In one mandible, in which 
the row is nearly entire, there are eighteen or nineteen teeth ; 
and in the mandible of another species fourteen or fifteen can 
be counted. The teeth in the maxille appear to be equally 
numerous. 
The teeth themselves (Pl. XVI. figs. 1 & 2) are, as we have 
already said, sharp-pointed and conical; they are a little re- 
curved, the bend being usually greatest a short way above the 
base. ine large specimens are upwards of one-eighth of an 
inch long; but they are generally much less; they vary con- 
siderably in this respect in the different species. They are 
most frequently wide at the base, and contract rather sud- 
denly immediately above; thence the attenuation is very 
gradual, until within a short distance of the apex, a little be- 
low which the crown is slightly swelled; from this point the 
sides of the tip incline more rapidly towards each other, and 
- unite to form an extremely sharp apex. In some species the 
apex is much produced and attenuated, in others it is com- 
paratively short; but in all it is characterized by its sharp- 
ness. ‘The sharp-pointed tip or apex is formed of a thick ca 
of enamel, and is usually quite smooth and highly poltched, 
Below the cap, in all the species examined, the crown has a 
subdued lustre, and is fretted in a very beautiful manner with 
numerous minute, short, close-set, longitudinal depressions, 
which, being arranged lengthwise, have occasionally a lateral 
inclination : hence the peculiar fretted appearance of the sur- 
face. : 7 
On making a longitudinal section (Pl. XVI. fig. 2), the pulp- 
cavity is seen to conform to the shape of the crown; the 
cavity is wide below and narrow above, tapering gradually 
towards the apex, and terminating just within the extremity 
of the dentine. The tip of enamel fits on to the top of the 
dentine like a ferrule, and is in the form of an inverted V, 
with the angle filled up for some distance, and the stout limbs - 
turned out a little below and mortised, as it were, into the 
dentine. The enamel-cap varies a little in form in the different 
species; but it varies still more in accordance with the plane 
of the section. When the section is made directly ee the 
centre, the solid apical portion of the enamel is seen to be . 
much produced, and very sharp. By making the section a 
little eccentric, the solid tip is reduced’ in length and pubic 
ness; and by carrying the process a little further, the enamel- 
cap becomes a mere thin covering, like a transverse section of 
