TABLE OF 0O:^TEI^TS. 



Table of contents . . . 

 List of illustrations 



Introduction - 



Family Lepadidte 



Key to the genera of Lepadidee 



Subfamily Scalpellinje : 



Genus Mitella 



poUicipes 



polymerus 



mitella 



Genus Lithotrya 



pacifica 



dorsalis 



Genus Scalpellum 



Key to subgenera and sections of the genus Scalpellum , 



Subgenus Calantica 



Scalpellum eos 



superbum 



Subgenus Smilium 



Scalpellum 



Key to North American species 



Group of Scalpellum scalpellum 



Scalpellum stearnsii 



scalpellum 



gibbum 



patagonicum 



Group of Scalpellum californicuni 



Scalpellum californicum 



osseum 



Group of Scalpellum stroemii 



Scalpellmn stroemii 



substroemii 



latirostrum 



pressum 



angustum 



Section IV. Holoscalpellum 



Key to North American species 



Group of Scalpellum velutinum 



Scalpellum velutinum 



regium 



latidorsum 



regina 



giganteum 



