XI. 



SPECIAL ANATOMY OF THE TERRESTRIAL GASTEROPODA 

 OF THE UNITED STATES. By JOSEPH LEIDY, M. D. 



OF PHILADELPHIA. 



INTRODUCTION. 



When the researches were commenced in the winter 

 of 1844, of which the following chapters are the result, it 

 was the proposition of Dr. Binney for the author to give 

 a complete anatomical and physiological description of 

 the terrestrial Gasteropoda of the United States, includ- 

 ing the special and general anatomy, with the embryo- 

 logy of the several genera. Before the special anatomy 

 was fairly completed, the death of Dr. Binney put a stop 

 to the work ; and, a diflferent course of observation hav- 

 ing occupied the author's attention, the subject is now 

 published, after a long delay, in its present incomplete 

 state, from notes taken at the time. 



The animals dissected are as follow : — 



LiMAX ; L. variegata, L. agrestis, L. campestris. 



Arion ; A. Jwrtensis. 



Tebennophorus ; T. caroUnensis. 



Vaginulus ; V. floridanus. 



