Page 2, last line, insert is before Vermetus. 
4, Balanus radiates, add is Conia radiata, 
De Slain. 
10, erase 180 before Goodallii. 
add 160 before Manillee. 
erase 181 before nana. 
add 181 before oriontalis. 
21, 3d line from bottom, for Osteoderma read 
OsUodesma. 
22, afterNo.-450,forcamellosa,read lamellosa. 
8th line from bottom, erase t's Saxicava 
Fholadis. 
7th line from bottom, add is Saxicava 
Fholadis. 
26, 22d line, for Orchroleuca, read Ochro- 
leuca. 
28, 4th line from bottom, for Young read 
(young.) 
53, 3d line from bottom, insert “ var. 
67, 1 1th line, for avicularis, Lam., read syr- 
matophora, Sowb. 
ERRATA. 
Page 69, 10th line, for regulosa read rugulosa. 
110, 32d line, for canalicuta read canalicu- 
lata. 
132, 33d line, fo£ perversus, Linn., read con- 
trarius, Mull. 
140, 18th lino, add is Helix mirahilis, Fer. 
147, 20th line, for perversus, Linn., road con- 
trarius, 31ull. 
153, 30th line, for marginata, Pfr., read mar- 
garita, Ffr. 
1 68, 1 6th line, insert is before Helix Trochoides. 
174, 29th line, for Helix felicina read Trichia 
Jilicina, Harim. 
179, 23rd lino, for Bradybaea read Brady- 
baena. 
191, 9th line, for Bulimus read Bulinus. 
202, 31st Hnc, insert is before Bulimus. 
221, 33d line, insert 5322 a, before semide- 
cussata, Menke. 
242, 15th line, add is Clausilia leucostigma, 
Ziegler. 
Page 251, erase 5744, also 59, insert is 
before Vitrina. 
261, 23d line, insert is before Helicina. 
269, 23d lino, erase 6284, insert is before 
Lymnaea. 
24th line, erase 6285, insert is before 
Lymnaea. 
276, 28th line, erase 6541. 
292, 22d line, erase 7011, add is Natica 
pusilla. Say. 
320, 25th line, erase 7907, insert is before 
Defraneia. 
370, 31st line, insert is before Oliva. 
377, 41st lino, for Dupontiae read Dupontii. 
379, 21st line, for millipora road millepora. 
396, last line, for Arausiensis read arausi- ' 
ecus. 
398, 40th line, insert 10,482 a, before coc- 
cineus. 
403, 12th line, erase 10,651, add is Conus 
vexillum, Mart. 
