78 



EXPLANATION OF PLATES. 



Plate XIII. 

 Fig. 1. Stenochiton cymodocealis, n. sp., side view. 

 fJ 2. ,, posidonialis, n. sp., side view. 



,, 3. ,, juloides, Ad. and Ang., side view. 



,, 4. ,, cymodocealis, n. sp., from above, natural 



position, 

 ,, 5. ,, ,, n. sp., from above, flattened- 



out girdle. 

 ,,6. ,, posidonialis, n. sp., from above. 



,, 7. ,, juloides, Ad. and Ang., from above. 



Plate XIV. 

 .Fig. 8. Stenochiton juliodes, Ad. and Ang., posterior valve. 

 „ 9. ,, ,, Ad. and Ang., median valve. 



,, 10. ,, ,, Ad. and Ang., anterior valve. 



,, 11. ,, cymodocealis, n. sp., in situ, on stem of 



cymodocea. 

 «, 12. ,, ,, (a J anterior valve. 



(b) median valve. 



(c) median, showing arcli. 



(d) posterior valve. 



(e) inside of anterior valve, 



showing teeth. 

 ,,13. ,, posidonialis, n. sp., (a) anterior valve. 



(b) median valve. 



(c) posterior valve. 



(d) inside of anterior 



valve, showing 

 teeth. 

 ,, 14. ,, pallens, Ashby, (a) anterior valve. 



(b) median valve. 



