TABLE OF CONTENTS. VII 



Family Lepadidfe — Continued. I'as^^ 

 Subfamily Lepadime— Continued. 



Genus Lepas "9 



Key to American species 79 



Lepas anatifera 79 



hillii 80 



anserifera 80 



I^ectinata 81 



fasciculatus 81 



Genus Poecilasma 82 



Key to genera and subgenera 82 



Key to American species of Poecilasma and Megalasma 83 



Subgenus Poecilasma 84 



Poecilasma ka?nipferi 84 



litum _ . 85 



nov«?anglife 85 



injequilaterale 85 



breve 87 



Genus Megalasma 87 



Subgenus Glyptelasma 87 



Megalasma gracile gracilius 88 



annandalei 89 



rectum 90 



subcarinatum 91 



Subgenus INIegalasma 93 



Megalasma bellum 93 



Genus Octolasmis 93 



Key to North American species of Octolasmis 94 



Octolasmis geryonophila 94 



miilleri 95 



forresti 96 



Subgenus Dichelaspis 96 



Octolasmis americanum 96 



hawaiense 97 



Subfamily Alepadinte 98 



Genus Conchoderma _ 98 



virgatum 99 



auritum 99 



Genus Heteralepas 100 



cygnus 101 



(Paralepas) percarinata - . . 103 



Genus Alepas 103 



pacilica 105 



Family Yerrucid;e 106 



Genus Verruca 106 



nexa 107 



alba 107 



euglypta 1 08 



calotheca 1 10 



darwini Ill 



hoeki 113 



Bibliography 115 



Explanation of plates 117 



Index 121 



4715— Bull. 60—07 ii 



