GASTEROPODA. 83 
Marearira Gromntanpica, Chemnitz. Supplement, Tab. V, figs. 11, a, 6. 
TrocHus GRoENLANDICcUS, Chemn. Conch. Cab., vol. v, p. 108, t. clxxi, fig. 1671. 
Marearita unputata, Gould. Invert. Massach., p. 254, fig. 172.* 
— — S. P. Woodward. Norwich Crag Shells, p. 5, 1864. 
Diameter, + of an inch. 
Locality. ¥lavio-marine Crag ?, near Norwich. Middle Glacial, Hopton. 
A specimen of this species has been obligingly forwarded to me by Mr. Bayfield, of 
Norwich, and he thinks it was found either at Thorpe or Postwick, but he is not able to 
say whether it is from the upper or lower bed. ‘The present specimen is not a 
full-grown individual, as it possesses little more than three volutions. G. B. Sowerby 
describes this shell (47. wndulata) as having four, Messrs. Forbes and Hanley describe 
it as having five, and Mr. Jeffreys as having six, volutions. 
Three varieties of this species are given by Mr. Jeffreys, and our present shell seems 
to correspond with the one he has named /evior, which is said to be smooth. ‘The Crag 
shell has visible lines of growth with one or two nearly obsolete spiral ridges, but there 
are no nndulations upon the upper part of the volution. 
‘The pullus of this species, as well as those of 17. maculata and M. trochoidea, are free 
from strize or ornament of any kind. 
Several small specimens, more or less imperfect, of a Margarita have occurred in the 
Middle Glacial sand of Hopton. Their rubbed condition will not allow one to say posi- 
tively that they belong to this species, but there can be little doubt of their belonging to 
one of the varieties of it. — 
Marearira macunata, S. Wood. Crag. Moll., vol. i, p. 135, Tab. XV, fig. 3. 
Localities. As in ‘Crag. Moll.’ 
This elegant species would be a shell of some importance if the one found fossil in 
America and also recent upon the Coast of California should be identical with it. I have 
not been able to see the fossil from Williamsburg, spoken of by Sir Charles Lyell 
“ Solarium, nearly allied to Solariella maculata,” ‘Proc. Geol. Soc.,? 1845, p. 559, but I 
have compared a recent shell from the Cataline Islands Solariel/a peramabilis, Carpenter, 
“Rep. Moll., West Coast of N. America,” ‘ Brit. Assoc., p. 653, 1864, with the Crag 
species. The recent shell has a more elevated spire, and in consequence a more 
contracted umbilicus, while the striz in the Crag shell are rather more distinct. 
The shell from the Cataline Islands is of a rufous brown, and possibly the spots 
remaining upon the Crag fossil may be some of its original colour. 
