INTRODUCTION. 
59 
TABLE OF TWENTY-THREE SPECIES OF HELIX, 
DESCRIBED BY THOMAS SAY, ANTERIOR TO, AND DURING THE EARLY 
PART OF THE YEAR 1821, 
SHOWING THE SYNONYMS SUBSEQUENTLY ATrLIED TO THEM BY 
EUROPEAN AUTHORS. 
No. 
Mr. Say. 
Specific cames. 
1821. 
M. Ferussac. 
Prodrome Geo. 
1822. 
M. Lamarck. 
Anim ears. Vert. 
1822. 
M. Desdayes. 
Encyc. Method. 
1830. 
M. Deshayes. 
Lamarck, 2d edit. 
1838. 
1 
2 
3 
4 
5 
6 
7 
S 
9 
10 
11 
12 
13 
1-1 
HELIX. 
albolabris. 
tridentata. 
alternata. 
thyroidus. 
Iabyrintliica. 
liirsuta. 
perspectiva. 
liiieata. 
aiiriculata. 
septemvolva, 
multilineata. 
appressa. 
palliata. 
HELIX. 
albolabris. 
tridentata. 
alternata. 
thyroidus. 
Iabyrintliica. 
hirsuta, 
iiva. 
liiieata. 
auriculata. 
septemvolva. 
HELIX. 
bonplandi? 
HELIX. 
HELIX. 
bonplandi? 
tridentata. 
scabra. 
thyroidus. 
tridentata. 
scabra. 
thyroidus. 
scabra. 
hirsuta. 
liirsuta. 
perspectiva. 
i 1 
auriculata. 
planorbula. 
planorbula. 
planorbula. 
linguifera. 
denotata. 
clausa. 
Unguifera. 
linguifera. 
linguifera. 
denotata. 
clausa. 
clausa. 
16 
17 
18 
19 
20 
21 
22 
23 
elevata. 
interna. 
chersina. 
gularis. 
ligera. 
solitaria. 
concava. 
profunda. 
knoxvillina. 
1 
1 
i 
rafinesquea. 
1 
planorboides. 
richardi. 
richardi. .richardi. 
richardi. 
It would be wrong to impute to either of the distin- 
guished gentlemen who have been named, any inten- 
tional injustice to Mr. Say. M. Ferussac indeed, as- 
cribed to him all the species whose descriptions he had 
seen, previous to the publication of his own work, and 
those only, although it was in his power to have pro- 
cured all of them. M. Lamarck had no definite no- 
