BEMBRIDGE MARLS. l77 



fossils which he had obtained. A short distance west of Gurnard 

 Ledge the section of the lower part of the cliff was : — 



Ft. In. 



Blue clay - - - - - - - 1 



Fine-grained blue-hearted limestone, like lithographic stone. 

 Many insect remains, and occasional leaves and fresh-water 

 shells. This bed does not appear to be perfectly continuous, 

 but forms large thin cakes dying out for a few feet and 

 coming on again at the same horizon. One portion, a 

 little further west, thickened to 2 feet, and was full of 

 insect remains, but is now entirely destroyed - - 3 



Blue clay - - - ' - - - - 3 



Sandy bed, full of Cerithium mutabile - - - 3 



Blue clay, with Cyrena obovata, Melania muricata, Melanopsis 



carinata, and Paludina globuloides - - - - 2 6 



Ferruginous loam, with Ostrea vectensis, Cytherea incrassata, 



Cyrena, Cerithium mutabile, &c. - - - - 10 



Bern bridge Limestone. 



Mr. Smith has traced the Insect Bed from West Cowes nearly 

 to the Newtown river. He states that it varies in thickness from 

 2 inches to about 2 feet, though the extreme measurement of 

 2 feet is quite exceptional. Its distance above the Bembridge 

 Limestone also varies slightly, sometimes being as much as 

 9 feet. 



The fossils of the Insect Bed have been collected during many 

 years by Mr. A'Com't Smith, to whose industry we owe the 

 wliole of our knowledge of this interesting fauna. Among the 

 forms contained in his collection are numerous beetles, flies, 

 locusts, and even s])iders and caterpillars. These have been as 

 yet only partially studied, but Mr. Frederick Smith gave the 

 following list of genera* : — 



I. COLEOPTERA. V. NeuROPTERA. 



1. Staphylinus. 12. Phryganea. 



2. Dorcus (Lucanidse). 13. Termes ? 



3. Anobium. 14. Hemerobius. 



4. Curculio, 15. Perla. 



16. Agrion. 



II. Hymenoptera. 17. Wings of Libellula. 



5. Wings of. ,,., r\ 



6. Formica. ^I- Orthoptera. 



7. Myrmica. 18. Gryllotalpa. 



8. Camponotus. 19. AcridiidEe. 



III. Lepidopteba. VII. Hemiptera. 



9. Lithosia. ' 20. Wing of? 



21. Triecphora sanguinolenta. 



Ai 



11. TipuTidag. 1. Spider. 



IV. Diptera. 

 10. Wings of. Arachnida 



* In Dr. Woodward's paper. 

 E 56786. 



