PLATE I. 



GILL SHAPES. 



PIG. 1. GILLS AS VEINS ; CAP INFUNDIBULIFOBM. FIG. 9. 



2. GILLS BOUNDED IN FEONT (anteriorly.) 10. 



3. GILLS BOUNDED BEHIND (posteriorly.) 11. 



4. GILLS LANCEOLATE. 12. 



5. GILLS VENTEICOSE. 13. 



6. GILLS UNEQUAL ; CAP CONVEX. 14. 



7. GILLS ADNEXED. 



8. GlLLS EMAEGINATE, ALSO ADNATB AND 15. 



HAVING DECUEEENT TOOTH. 



GlLLS 8EBBATB. 



GILLS FLEXUOSE; WAVED. 



GILLS DICHOTOMOUS. 



GILLS FEEE ; CAP BBOADLY UMBONATE. 



GILLS NAEEOW ; CAP MAEGIN EEFLEXED. 



GlLLS SLIGHTLY ADNEXED ; CAP UMBO- 



NATE; MAEGIN INVOLUTE. 

 GILLS DECUEBENT ; CAP UMBILICATE. 



