SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 98, NO. 10, PL. 4 





8 



^ST 



New Species of Mollusks 

 i-2, Lyonsia (Phlyctiderma) lucasana, 



3, Lyonsia {.Phlyctiderma) lucasana, detail of sculpture. ■ io. 

 4-7, Brachidontes multiformis houstonius, n. subsp., X4. 

 8-10, Aplysia cedrosensis, shell, natural size. 



