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 m3^ many obligations to my j^oung 

 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. iii. No. 9, Cambridge, 1873. 



The sign f is affixed to the name of species whose jaw and lin- 

 gual membrane are unknown. 



PULMONATA GEOPHILA. 

 OLEACINID^. 



tGrlandina Vanuxemensis, Lea. tGlandina buUata, Old. 



truncata, Gmel. tTexasiana, Pfr. 



tdecussata, Desh. 



HELICID^. 



YiTRININ/E. 



Macrocyclis Vancouverensis, Lea. Macrocyclis Voyana, Newc. 



tsportella, Gld. Duranti, Newc. 



concava, Say. 



' A complete list of all these papers may be had of the American Natur- 

 alist Agency, Salem, Mass. 



