169 
TU RRILITES tuberculata 
TAB. LXXIV. 
Spec. Char. Whorls of the spire beset with one 
row of large obtusely-conical projections or 
tubercles, and three rows of smaller tubercles 
below them. 
The upper row of tubercles extends along the middle part 
of each whorl ; they are in number about eight or ten to 
each whorl, and placed at distances nearly equal to their 
diameter. The siphuncle (mention of which is omitted in 
the Generic Character on page 81 , on account of uncertainty) 
is placed near the upper part of the whorls. 
Who would have imagined, but a short time since, that 
Great Britain could possibly have been favoured with such 
a variety of natural productions as are now continually 
discovered. The present specimen among others, in this 
work only, is a proof of an increasing activity of research * 
We have been able to pourtray this magnificent shell 
through the kindness of the assiduous G. A. Mantell, Esq, 
F. L. S. accompanied with the observations of locality at the 
end of this description ; it is not only valuable as a shell of 
rare occurrence, but from its extraordinary size, for if per» 
feet it must have measured more than two feet in lengthy 
according in proportion with the gigantic species of Am« 
monites, a Genus to which it is analogous in its chambered 
structure. 
