354 Mr. Lyell 07i the Boulder Fvrmation, 



oblique than the common form); 8. P. vortex; 9. P. Icevis^ 

 Alder, Newcastle Trans. ; 1 0. Cyclas pusilla ; 1 1 . C. cornea. 



Specimens of U7iio 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 unknown 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 yb?/?' : 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.) 



Fis. 4. 



Paludina minuta, from the freshwater beds at Mundesley ; the middle 

 figure is of the natural size. 



bisects. — 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. Iinea7'is ?) 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. oplionus or H. argutor). He also refers with 

 confidence another elytron to Copris lunaris, a British beetle. 



Fish. — I 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 vertebra 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 



