354 
Mr. Lyell on the Boulder Formation^ 
oblique than the common form); 8. P. vortex \ 9. P. Icevis, 
Aider, Newcastle Trans. ; 1 0 . Cyclas pusilla ; 1 1 . C. cornea. 
Specimens of Unio or Anodon occur, but too imperfect to 
be determined ; one however resembles A. cygneus. 
Of the eleven shells above enumerated, the only one which 
is unknowm as a living species is the Paludina minuta, found 
by Mr. Strickland in a freshwater deposit at Crophorn, in 
Worcestershire, and also by Mr. Wood at Stutton on the 
Stour in Suffolk. Mr. George Sowerby, who has examined 
this species for me, finds that among recent species it agrees 
most nearly with the Turbo thermalis, Lin., as its volutions 
are exactly four : its apex is more obtuse and its volutions are 
more ventricose than in other recent species, and it is con- 
stantly smaller. (See fig. 4.) 
Fig. 4. 
4 
Paludina minuta, from the freshwater beds at Mundesley ; the middle 
figure is of the natural size. 
Insects. — The elytra of beetles are not uncommon in the 
clay of Mundesley, especially those of the genus Donacia, a 
tribe which frequents marshy grounds. The beautiful green 
and gold colours of these wing cases are almost as bright 
when first the clay is removed as in the living insect, but they 
soon lose a great part of their lustre on exposure to the light. 
Mr. Curtis, to whom I am indebted for an examination of 
these fossils, says that there appear to be two species of 
Donacia, (one of them D. linearisl) both probably identical 
with recent British insects; and among the other remains he 
found the thorax of an Elater, and the elytron of one of the 
Harpalidae (H.ophonus or H. argutor). He also refers with 
confidence another elytron to Copris lunaris^ a British beetle. 
Fisk. — l found many scales offish, together with one large 
tooth, at Mundesley, and Mr. J. B. Wigham sent me similar 
remains, together with a smaller tooth, and some vertebr/e and 
ribs offish. These I submitted to the Rev. Leonard Jenyns and 
Mr. Yarrell, who referred them to the genera Perch, Carp, 
Pike, and Trout. The pike appears both by the teeth and 
scales to be the common Esox lucius. Of the sal mo there 
were several small and one large scale, in which the concentric 
