171 
TURRILITES undulata. 
TAB. LXXV.—Figs. 1, 2, and 3. 
Spec. Cuar. Whorls decorated with many gently 
undulated coste, mostly continuing from the 
upper to the lower part of each. 
== EE 
Turre are sometimes indications of a row of tubercles 
below the costz, and sometimes the costw themselves are 
somewhat depressed near the middle, as if they were dividing 
into knobs. Some persons doubt whether this be not a 
variety of Turrilites costatus, Tab. 36, I, however, consider 
it deserving of a distinct figure, and I have received, since 
this plate was engraved, some specimens which serve in 
some measure to confirm me in my opinion of these being 
distinct species, as they agree on the whole with the larger 
outline, Fig. 1, which shows they are sometimes of a con- 
siderable size, and the more finished representation, Fig. 2 
with very little depression in the coste. Fig. 3 shows a 
variety somewhat approaching the costata, but even in this 
there is but one row of tubercles, and that would be con- - 
cealed by the next whorl. 
This species is found at Hamsey with the .. iiss 
while T. tuberculata seems only to belong to Ringmer. | 
As it requires some time to be assured whether one I have 
received from Stoneham is not another distinct species, 
having one row of larger and two of smaller tubercles, 
while T. tuberculata has one row of larger and three of 
