160 
1 have received specimens of this among shells from the 
Hordwell Cliffs; they do not vary much in size, and seem 
but little changed, which makes me rather doubt whether 
they really be fossil. 
DENTALIUM striatum* 
TAB. L XX— Fig. 4. 
Spec. Char. Surface marked with ten or eleven 
longitudinal acute prominent striae, and several 
obsolete intervening ones ; lines of growth fine, 
numerous ; aperture circular. 
The longitudinal striae are very regular and prominent at 
the smaller end of the shell, making it about ten-angled, but 
they disappear towards the mouth; there arc from one to 
four intervening minute striae, which are most apparent 
near the middle of the shell. The thickness is nearly equal 
throughout, and the inside smooth; length about two inches. 
I am rather doubtful whether this species, from its being 
sometimes nearly covered with longitudinal striae, and 
sometimes nearly destitute of them, has not been made into 
two species, entalis and Elephantinus, by Brander; or it 
may otherwise have been deceiving, as the outer ornamented 
part is sometimes separated in a thin coat, leaving the other 
inner part nearly smooth; the figure shows the outer coat 
whiter, and the inner part smooth and not shining, otherwise 
it might have been considered as the Highgate species, from 
which it is however sufficiently distinct in other respects. 
I have received these by favour of Mrs. Tylee and the 
Rev. Mr. Bingley, from Hordwell and Barton Cliffs. 
