PLATE XVIII. 



Fig. 1. Scala hellenica var. Morchiana Dall ; 6.87. Page 322. 

 Scala discobolaria Dall ; 6.5. Page 324. 

 Actceon perforatus Dall ; 7.75. Page 42. 

 Scala aurifila Dall ; 11.0. Page 322. 

 Niso interrupta Sowerby var. albida Dall ; 8.1. Page 330. 

 Niso interrupta var. albida Dall, base ; 3.5. Page 330. 

 Aclis nucleata Dall ; 9.3. Page 325. 

 Aclis lata Dall ; 5.5. Page 324. 

 Scala contorquata Dall ; 4.7. Page 318. 

 Scala polacia Dall, aperture imperfect ; 7.25. Page 319. 

 Scala formosissima Jeffreys ; 8.5. The aperture is a little distorted where 



it joins the body whorl. Page 319. 

 Scala belaurita Dall ; 8.3. Page 316. 

 Aclis egregia Dall ; 13.0. Page 325. 



