APPENDIX. 
171 
APPENDIX. 
Among recent additions to the exhibited series of Mollusca (pp. 122- 
144) are the following : — 
Shells from various non-marine deposits of Cainozoic age in 
Germany, such as those in the Mayence basin. The genera ex- 
emplified include Planorbis, Liinnaea, Clausilia, Pomatias, Neritina , 
Unio, Corhicula, and Dreiasensia, with Helix and its allies. 
The evolution of form and sculpture is illustrated by continuous 
series of growth-stages in the modern Melanopsis Parreysii, peculiar 
to Hungary, and in its predecessors found in the Pleistocene deposits 
of that country. Tbe specimens are arranged on the plan of Dr. Toth 
Mihaly, as advocated by S. Brusina (see “ Mitt. Nat. Vercin Stcier- 
mark,” 1903, p. 101, and “ Foldtani Kozlony,” 1905, p. 421). 
Another small series purports to show tlie evolution of certain 
species cf Viviparus. Specimens from the Pliocene rocks of Slavonia 
were originally studied by M. Neumayr, who found that specimens 
with more complicated sculpture occun-ed in the upper or newer part 
of the deposits, and appeared to be descended from the smooth forms 
common in the lower and older beds. 
Traces of the original colour-markings are occasionally found in 
fossil sliells (see p. 123). Others again sometimes show pearl-structures 
(see p. 135). Both these appearances have recently been studied 
(“ Proc. Malacological Soc. London, 1907, 1908), and illustrative 
specimens are now exhibited. 
Gallery 
VIII. 
Table-Case 
next A3. 
Wall-case 
lA. 
Between 
wall-cases 
2 & 3. 
Wall-ease 
3C. 
N 
