JOUR* 



ACAD NAT. SCI. PHILA.. 2ND SER . VOL. XV. 



PLATE XXXIX 



20b 



Mm 



20 e 





20g 



20h 



* 



t* 







20 



4> 



20 



j 



20m 



20n 



. 



»U»M» »,> 



/^ 



,.:. 



20 



o 







f 



21 



22 







24 



bi 













¥ 



PILSBRY: VARIATION AND ZOOGEOGRAPHY OF LIGUUS 



