INDEX. 



GENUS 11. MYTILUS MUSCLE. 



FLUVIATILES. RIVER. 



Plate. Fig. 

 Mytilus Cygneus, great Horse Muscle • 55 



MARINE. SEA. 



Mytilus curvirostris, wry beak • 4° 



Mytilus barbatus, bearded - 



PART III. 



GENUS 13. CHAMA. GAPER. 

 MARINE. SEA. 

 Chama magna, large 5S 



GENUS 14. SOLEN." SHEATH OR RAZOR SHELL. 



Solen siliqua. Pod - - - - - 46 



Solen ensis. Scymetar - 50 



Solen legumen. Peasecod - - - - 53 



PART IV. 



MULTIVALVES. 

 GENUS 16. PHOLAS. PIDDOCKS, 



Pholas bifrons, double-fronted 6a 



Pholas parvus - .... 69 



vol. 11. I 



