COOKE : EADULA OF THE VOLUTIDjE. 



8 



Rhachidian Tooth of — Fig. 1. V. musica. 



2. V. Sophia. 



3. V. africana. 



4. V. ponsonbyi. 



5. Ly. mitrceformis. 



6. Ly. queketti. 



7. V. verconis. 



8. V. papulosa. 



base, springing from the extreme ends of tlie framework, points often 



turned slightly inward ; framework deep, often narrowing at the 



