152 PROCEEDINGS OF THE ACADEMY OF 
those papers' were published in connection with my friend, Mr. 
Bland, without whose aid I never could have had the material to 
study lingual dentition, especially in the interesting forms foreign 
to the United States. He has also shown great interest in the 
progress of the present paper. 
Finally, I must acknowledge my many obligations to my young 
friend, Mr. A. Ten Eyck Lansing, for his most valuable assist- 
ance in the preparation of my paper. His observations of most 
of the lingual membranes, independent of my own, have saved 
me from many errors, and rendered my work much more reliable. 
I will add that all the figures in the plates have been drawn by 
my own hand from the microscope itself, with the aid of the 
camera lucida. 
BuRLINGTON, N. J., Oct. 1874. 
A complete catalogue of the species found in North America, 
from the extreme north to the Rio Grande and to San Diego, here 
follows. An account of their geographical distribution has been 
published by me in the Bulletin of the Museum of Comparative 
Zoology, vol. ii. No. 9, Cambridge, 1873. 
The sign + is affixed to the name of species whose jaw and lin- 
gual membrane are unknown. 
PULMONATA GHOPHILA. 
OLEACINID&. 
*Glandina Vanuxemensis, Lea. tGlandina bullata, Gld. 
truncata, Gmel. jTexasiana, Pfr. 
tdecussata, Desh. 
HELICIDA. 
VITRININA. 
Macrocyclis Vancouverensis, Lea. Macrocyclis Voyana, Newe. 
tsportella, Gld. Duranti, Newc. 
concava, Say. 
1 A complete list of all these papers may be had of the American Natur- 
alist Agency, Salem, Mass. 
