1902.] 



NATURAL SCIENCES OP PHILADELPHIA. 



845 



Zaocys carinatus 694 



Zaptyx 373, 381 



Zonites carolinensis 430 



lasmodon var ? \35 



lawi 4S5 



placentula 438 



placentulus ^55 



■wheatleyi ^5i 



Zonitoides 513 



arboreus 420, 433 



elliottii 430, 433 



milium 420 



minnsculus 420 



nitidus 431 



patuloides 417, 430 



Zostera marina 650, 660 



