ERRATA. 
Page 41, line 1, for 1829 read 1859. 
392, line 11, for fasiculata read fasiculatum. 
s 22, for cylindraceus read cylindraceum. 
- Add to the list Lowonema sulculosa. 
398, line 20, for longispina read longispinus. 
- 22, for duplicicosta read duplicicostatus. 
i 24, for Aviculu rugosa read Aviculopecten rugosus. 
Ks 28, delete Orthis filiaria. 
os 19, for Athyris gibera read Atrypa gibbera ; but it should be conjoined with 
Orthis resupinata. 
