PLATE XXXII 



i. Murex ramosus, Linn., showing the recurved spine (s.) in the 

 aperture used by the animal to force open the shells of bivalves, on 

 which it feeds. 



2. Velatcs conoidcus, Lamk , young shell v.'ewed from the apex. 



3. V 'elates conoideus, Lamk., showing the mouth and callus on the 

 columellar lip. 



4. V elates conoideus. Lamk., an older specimen at the stage when 

 excessive development of the callus sets in. 



5. V elates conoideus, Lamk., adult showing callus mostly covered by 

 a thin outer layer of shell. 



6. V elates conoideus. Lamk., section showing how the successive 

 layers of callus have been formed and then removed on the inside, 

 whilst the thin portions at the apex of the shell have been strengthened 

 by the deposition of additional shelly matter. 



7. Opisthostoma ' grandispinosa, God.-Aust., in which the body-whorl is 

 carried right up over the top of the spire ; a, apex of shell. 



8. Gibbus Lyonetanus, Pall., showing the pinched in body-whorl. 



9. Blcesospira echinus, Pfr., in which the whole shell is scalariform. 



10. Brachypodella Brooksiana, Pfr., in which the last whorl is uncoiled. 



11. Ficus ventricosus, Sby., a Taenioglossate genus ) Resembling each 



- other in form of 



12. Sycotypuspyrum, Dillw., a Rhachiglossate genus J shell. 



13. Septi/er bilocularis, Linn., a Filibranch genus ^ Resembling each 



14. Dreissensia polymorpha, Pallas, a Eulamelli- r other in form of 



branch genus 



shell. 



15. Petricola plwladiformis, Lamk.. belonging to the* 

 Veneracea, an inhabitant of the coasts of the United 

 States, now acclimatized on the shores of the British j Resembling each 

 Islands ; has similar habits to, and is found with — j- other in form of 



16. Barnea Candida, Linn., belonging to the Ades- 

 macea 



17. Lithodomus litJwphagus, Linn., a Filibranch genus^ 



18. Coralliophaga coralliophaga, Gmel., a Eulamelli- 

 branch genus that occupies the vacant burrows of the 

 preceding. Two or three dead shells of this species J shell, 

 are sometimes found one within another, as well | 

 as that of the original excava'or of the cell 



*** Original draivings by Miss G. M. Woodward. 



Resembling each 

 other in form of 



