EXPLAXATIOX OF PlATE 6 



Fi(;s. 1-3. — J elutina undata Brown from 204, 453, and 453 feet, respccti\'ely; all probably 



forma lypica. 

 Fig. 4. — 1 elutina velutina (Miiller) from 453 feet, showing the longitudinal cuticular ridges 



characteristic of this species. 

 Fig. 5. — J'elutina velutina \-ar. schneideri Friele from 741 feet, showing the smoother cutic- 



ulum and evidence of a thin calcareous layer. 

 Fig. 6. — J'elutina plicatilii (Miiller) from 175 feet, view of interior. 

 Fig. 7. — J'elutina lanigera (Moller) washed ashore Sept. 12, 1949. 

 Fig. 8. — J elutina plicatilis (Aliiller) washed ashore August 1948, x'kw of exterior. 

 FiG.s. 9, 10. — J'elutina plicatilis, var. cryptospira Middendorif: 9, washed ashore Oct. 5, 

 1949; 10, washed ashore Aug. 21, 1949, showing sunken apex co\'ered b}- cuticulum. 

 Magnification: .\11 X 2. 



