Al SUPPLEMENT TO THE CRAG MOLLUSGCA. 
PiEvrotoma EQuaLis, S. Wood. Supplement, 'ab. III, me, Wi. 
Spec. Char. Pl. Testa elongato-fusiformi levi, aifractibus 6, convexiusculis ; obsolete 
angulatis ; suturis distinctis, sub-depressis, spira brevi, apice obtuso, apertura dimidiam 
aquante ; canali longuiscula, labro simplici acuto. 
Locality. Red Crag, Butley. 
Length, half an inch. 
The specimen figured is the only one that I have seen, and was obtained by myself 
from Butley. 
It is perfectly smooth and polished ; it resembles in form P7/. violacea, Migh. and Ad., 
but my shell has no sculpture, and it appears too perfect to have been abraded ; moreover, 
that shell is stated to measure 3ths only of an inch in length, whereas my shell is at 
least y’oths of an inch. I therefore presume it to be distinct, and have given to it a new 
name: 
PLuvrotoma RuFA, Wont. Supplement, Tab. VII, rite, IL, 
Localities. Red Crag, Butley? Fluvio-marine Crag, Thorpe?  Post-glacial, 
March. 
The specimen figured of this well-known British shell is one of two found by Mr. Harmer 
in the March Gravel. he species is given by Mr. Bell from the Red Crag of Butley 
(Ann. and Mag. Nat. Hist.,’ September, 1870), and in Dr. Woodward’s ‘ Norwich 
Crag List’ (in ‘White’s Directory’), from Thorpe, but I have not seen the specimens 
for either of those occurrences. 
PLEUROTOMA QuADRIcINoTA, S. Wood. Supplement, Tab. VII, fig. 11. 
Spec. Char. Pl. Testa turrita, sub-fusiformi, costata, costis sub-erectis, anfractibus 
6—-7, convewis transversim stratis, striis paucis ; apertura ovata ; labro intus levi. 
Locality. Red Crag, Butley. 
Length, ths of an inch. 
The above represents one of two specimens in good preservation which I found in the 
Red Crag at Butley. The shell somewhat resembles Murex harpula, Broc., but in the 
description of that species it is distinctly stated as “ interstitiis levigatis.”’ ‘The ornamen- 
tation upon the Crag shell is peculiar; there are four strong, large, spiral. lines upon 
the lower half of the volution (especially visible between the ribs), and the upper portion 
is covered with very fine spiral strie. My shell has seven volutions, including the 
