EXPLANATION OF PLATE XV. 



Goniostropha pritchardi, Eth. fil. 



Fig. 1. Shell seen from the front, showing mouth. 



„ 2. A similar example to Fig. 1. 



,, 3. Shell seen from the back. 



„ 4. A whorl, showing the amount of angularity, and position and 

 nature of the band, x 2. 



Mourlonia duni, Eth. fil. 



„ 5. Imperfect shell, seen from the back ; the sutural band is plainly 

 distinguishable. 



Helicotoma johnstoni, Eth. fil. 



6. Upper side, showing depressed spire. 



7. Under side with umbilicus. 



8. Back, exhibiting great width, perhaps somewhat assisted by dis- 



tortion. 



Trochonema ? nodosa, Eth. fil. 



9. Imperfect shell, seen from the back. 



10. The same, seen from the front. 



Holopea wellingtonensis, Eth. fil. 



11. Natural section of the whorls, showing the form of the latter. 



