GASTEROPODA. 95 
smooth (which, however, may be accidental), and it has a projecting shoulder to the 
volution ; perhaps it would be more correctly placed either in Zornatina or Acte@onina. 
I presume that this is the shell called eis by Mr. Jeffreys in his list to Mr. 
Prestwich’s Red Crag paper, p. 486. 
Curron piscrEpans? Brown. Supplement, Tab. IV, fig. 27. 
CHITON DISCREPANS, Brown. Conch., Gt. Brit., pl. xxxv, fig. 20, 1827. 
— —_ Forb. and Hanl. Brit. Moll., vol. ii, p. 396, pl. 58, fig. 4. 
—  crinitus, G. B. Sow. Desc. Cat. Brit. Chitones, p. 2, fig. 88—93; 
Ency. Method., pl. 163, fig. 11—17. 
Locality. Coralline Crag, Sutton. 
The figure above referred to represents the valve of a Chzfon, which I Have lately 
found, and which I have assigned to the above-named British species, though with some 
slight hesitation ; my specimen appears to be the third or fourth valve with the susten- 
tacula quite perfect, and these have a peculiar form. The length of the valve is about 
equal to the breadth of one of its sides, and the ornamentation appears to correspond to 
that of the shell to which it is here assigned. Unfortunately, in the works upon British 
Conchology we have neither represented, nor described, the form or magnitude of these 
processes to the valves, which are, in my opinion, good auxiliary characters. This central 
valve now figured seems to differ from those of fascicularis in bemg more rounded at the 
lateral posterior termination of the valve, and the sustentacula are rather larger. We are 
not likely for some time to obtain a fossil with all the valves in position, so that we must 
do the best we can with the materials we possess, and I have given my figure as one step 
towards a correct determination. 
Curton Risso, Payr. Crag Moll., vol. i, p. 186, Tab. XX, fig. 11. 
My Crag shell, which I referred as above, is regarded as Ch. cinereus, Linn., by Mr. 
Jeffreys (‘ Quart. Journ.,’ vol. 27, p. 143). My Crag valves form a perfectly semicircular 
arch, without any angularity or pointed keystone like those of cemereus, and I have 
therefore retained my original name. 
Curron striemuiatus, 8. Wood. Crag Moll., vol. i, p. 186, Tab. XX, fig. 10. 
This may probably be Ciiton Hanleyi of the ‘ British Conchologists.’ 
In the ‘ Geol. of Norfolk’ by S. Woodward, published in 1833, is the name of Chzton 
octovalvis (p. 44), and this name is repeated by his son Dr. S. P. Woodward, in his list 
