V<ol. 50.] FAUNA FROM THE IGHTHAM FISSURE. 209 



EXPLANATION OF PLATES X.-XII. 



All are specimens from the Ightham fissure, and the figures are of the 

 natural size unless otherwise stated. 



Plate X. 



Fig. 1. Rana temporaria. Humerus : a. front view ; 6, side view. 



2. „ „ Biconcave penultimate vertebra, seen from below. 



3. ,, ,, Left ilium, outer sui'face. 



4. Bicfo vulgaris. Right ilium, outer surface. 



5. Anguis fragilis. Portion of investing bony scales. 



6. ,, ,, Two scales, enlarged, showing broad edge overlapped 



by next scale. 



7. ,, „ Left ramus of lower jaw. 



8. Vipera berus. Left ramus of lower jaw, wanting anterior end. 



9. ,, ,, Vertebra, showing depressed articular cup. 



10. Alauda arvensis (Skylark). Eight humerus, front view. 



11. ,, „ ,, Right united metacarpals. 



12. „ ,, „ Right tarso-metatarsus, seen from behind. 



13. Saxicola (Enanthe. Left humerus, front view. 



14. „ „ Right united metacai-pals. (This figure represents 



the bone as too robust.) 



15. Larus? Right humerus : a, front view ; b, side view. 



16. Anas boscas ? Left humerus : a, front view ; b, side view. 



17. Anas . Left ulna. 



18. Butco ? Left tarso-metatarsus, wanting distal end : a, outer surface ; 



b, seen from behind. 



Plate XL 

 Fig.]. Sorex vulgaris. Skull, side view. X |. 



la. „ ,, Lower jaw, right ramus. Xf. 



2. Sorex pygmeeus. Skull, side view. Xf. 



2 a. „ „ Lower jaw, left ramus. Xf. 



3. Vespertilio Nattereri. Skull, seen from below. Xf. 



3 a. ,, ,, Lower jaw, right ramus. X?- 

 3 b. ,, ,, Femur, natural size. 



3 c. ,, ., Humerus, natural size. 



4. Lepus timidus. Left femur, front view, natural size. 

 A a. ,, ,, ,, ,, inner side. 



ba. ,, ,, Right humerus, front view. 



5. „ „ ,, ,, inner side. 



6. Lagomys 2)usilltis. Lower jaw, left ramus. 



6 a. „ ,, Cheek-teeth. x5. 



7. Mus syivaticus. Lower jaw, right ramus, with one cheek-tooth. 



7 a. „ „ Two lower cheek-teeth. Vh. 



8. Mus Abbotti, n. sp. Lower jaw, left ramus, with three cheek-teeth. 

 8a. ,, ,, Cheek-teeth of same. x5. 



9. Myodes lemmus. Lower jaw, left ramus, front cheek-tooth restored 



from another specimen. 

 9 a. ,, ,, Grinding surfaces of cheek-teeth. x5. 



10. ,, torquatits. Lower jaw, left ramus. 



10 a. ,, „ Grinding surfaces of cheek-teeth of same. x5. 



11. Microtus (Arvicola) ratticeps. Lower jaw, right ramus, with two 



cheek-teeth. 



1 1 a? „ ,, „ Grinding surfaces of cheek-teeth of 



same. x5. 



12. ,, ,, gregalis. Lower jaw, left ramus, with three 



cheek-teeth . 



12 a. „ „ ,, Grinding surfaces of cheek-teeth of 



same. X 5. 



13. Rhinoceros antiquitatis. First, or front, upper deciduous milk-molar. 



14. „ „ Third milk-molar. 



15. ,, „ Fourth milk-molar. 



