jOORN ACAD 



NAT SCI. PHILA , 2ND SER-, VOL. XV. 



PLATE XXXVIII 



11 



11 A 



12 





+>. 











12 



r «r 





13 







A 



11 













14 



14 



14 c 



15 



16 



16a 



' 



16 



D 



17 



17 



A 



18 



* 



18a 



19 



19 



A 



* 













l 





1 





•'liinv, »(*, 



PILSBRY: VARIATION AND ZOOGEOGRAPHY OF LIGUUS 



