GASTHROPODA. 27 
The costae of scalariformis ave much fewer than those of Bamfius, and the shell 
is of more than double the linear dimensions of Bamffius. Scalariformis occurs in 
the Fluvio-marine Crag of Bramerton, but is very rare in it, and a specimen has been 
obtained from the Middle Glacial sand of Billockby, and another from that of Hopton, 
both of which fell to pieces, but their fragments exhibit clearly all the characters which 
distinguish this shell from Bam/fius. 1 have not met with it from any of the localities 
of the Chillesford bed or from the Lower Glacial. It is given by Mr. Jeffreys as from 
Kelsea Hill. 
TropHon Barvicensis, Johnson. Supplement, Tab. VI, fig. 20. 
Pp 8 
Fusus Barvicensis, Johnson. Edinb. Phil. Journ., vol. xiii, p. 221. 
TROPHON » — Forb. et Hanl. Brit. Moll., vol. ii, p. 442, pl. exi, figs. 5, 6. 
Localities. Red Crag, Walton, and Shottisham (Bel/), Waldringfield. 
Mr. Canham has sent to me a specimen he has obtained from the Red Crag at 
Waldringfield, which I have referred and represented as above. ‘The fossil has been rubbed 
and its more prominent portions worn down, but it seems to correspond in all other 
respects. The periodical reflections of the outer lip called ribs or cost are about ten in 
number upon the last remaining whorl; these are decussated by four or five spiral lines or 
ridges, and it has an angular or projecting shoulder a little below the suture. The 
specimen measures half an inch in length. Mr. Bell gives the species as from Walton and 
Shottisham (‘ Ann. and Mag. Nat. Hist.,’ May, 1871), but I have not seen the specimens. 
TropHon Gunneri, Lovén. Supplement, Tab. III, fig. 18 a, 4. 
Tritonium GuNNERI, Lovén. Ind. Moll. Scand., p. 12, No. 84. 
Localities. Upper Glacial, Bridlington. Post Glacial, Kelsea Hill. 
My figure represents a specimen in the British Museum from Bridlington, and the 
late Dr. S. P. Woodward has introduced the name into his list of Norwich Crag shells, 
but with a mark of doubt. I have not, however, seen it from the Crag of either Suffolk 
or Norfolk. This much resembles scalariformis, but the fimbrie are furnished with 
projecting fronds. Mr. Jeffreys has (‘ Quart. Journ. Geol. Soc.,’ vol. xvii, p. 450) 
identified the shell as a Kelsea Hill species. 
TROPHON PAULULUS, Crag Moll., vol. i, Tab. VI, fig. 6, is, according to Mr. Jeffreys, 
the young of his Defrancia teres, ‘ Brit. Conch.,’ vol. v, p. 219. In this I think he is 
