ERRATA. 
P. 78, 26th line, for Say, read Sby. 
40th line, for nigricana, read nigricans. 
P. 79, 3d line, for Gemel, read Gmelin. 
5th line, for incongrus, read incongrua. 
12th line, for romosa, read ramosa. 
20th line, for nasuta, read nassula. 
29th line, for distans, read discus. 
33d line, for interpurpurea, read intapurpurea. 
P. 80, 6th line, for senulis, read similis. 
10th line, for Solenastraea hyade, read Solenastrea hyades. 
12th line, for Cupula.ria denticulata Lamarck, read Cupularia denticulata 
Lamarck X. 
