ERRATA. 
Page 392, line 11, for fasciculata read fasciculatum. 
: 22, for cylindraceus read cylindraceum. 
4 Add to the list Loxonema sulculosa. 
393, line 20, for longispina read longispinus, 
‘ 22, for duplicicosta read duplicicostatus. 
a 24, for Aviculu rugosa read Aviculopecten rugosus. 
J 28, delete Orthis filiaria, 
19, for Athyris gibera read Atrypa gibbera, but it should be conjoined with 
Orthis resupinaia. 
