248 Geological Society. 
Fig. 4. Cidaria albipunctaria, sp. n., 3, p. 642. 
ng. 5. Larentia nitidaria, sp. n., 3, p. 657. 
Fig. 6. Hydrelia distinctaria, sp. n., 3, p. 80. 
Ig. 7. Larentia grataria, Leech, J, p. 656. 
Fig. 8. Larentia (?) mter sectar 1, SPs De, '5 P 667. 
Fig. 9. Photoscotosia fasciaria, sp. n., 3, p. 672. 
Fig. 10. Cidaria fer vidaria, sp.u., d, p. 646. 
Fig. 11. Larentia tripunctaria, sp. n., d, p. 666. 
Fig. 12. Hydreha electaria, sp. u., 3, p. 81. 
Fig. 13. Cidaria postalbaria, sp. n., 3, p. 645. 
Fig. 14. Larentia costinataria, sp. n., 5, p. 670. 
Fig. 15. Cidaria ochracearia, sp. n., 3, p. 648. 
fulgidaria, sp. n., 3, p. 641. 
yr subochraria, sp.n., go, p. 647. 
Fig. 18. Hydretia angularia, sp. n., 3, p. 82. 
PROCEEDINGS OF LEARNED SOCIETIES. 
GEOLOGICAL SOCIETY. 
May 12, 1897.—Dr: Henry Hicks, F.R.S., 
President, in the Chair. 
The following communication was read :— 
‘The Mollusca of the Chalk Rock: Part Il” By Henry 
Woods, Esq., M.A., F.G.S. 
The first part of this paper, dealing with the Cephalopoda, 
Gasteropoda, and Scaphopoda, appeared in the last volume of 
the Quarterly Journal (vol. lil. p. 68). In the present commu- 
nication the Author gives an account of the characters, synonymy, 
and distribution of the Lamellibranchia: 29 species are recognized, 
6 being new; the genera represented are :—Leda, Nucula, Arca, 
Limopsis, Modiola, Inoceramus, Ostrea, Chlamys, Lima, Spondylus, 
Plicatula, Cardium, Cardita, Arctica, Tr apexium, Corbis’, Mariesia?, 
and Cuspidaria. 
In the concluding part the Author compares the fauna of the 
Reussianum-zone (Chalk Rock) in England with that of other 
European areas, particularly N.W. Germany and Saxony. In the 
latter country the number of species in some groups—particularly 
Gasteropoda and Lamellibranchia—is much greater than in Eng- 
land; this difference is probably due to the sea having been of less 
depth than in the English area, It is noticed that the species of 
Cephalopoda have a much wider geographical distribution than the 
\ other groups of the Mollusca. 
! Finally, by a study of the present distribution of the genera— 
particularly of those which form the predominating element in the 
fauna,—taken in conjunction with the other characters of the 
zone, the Author arrives at the conclusion that in England the 
‘= Reussianum-zone was probably formed between the depths of 100 
and 500 fathoms. 
