CONTENTS. 



Page. 



Introduction 1 



Acknowledgments 2, 3 



Terminology of the plates of sessile barnacles 3 



Homologies of the plates of sessile barnacles 6, 7 



The cirri 7, 8 



Material examined 9 



Distribution of American Balanomorph barnacles 10 



Notes on fossil barnacles 11 



Classification 12 



Descriptions of genera and species 14 



Suborder Verrucomorpha 14 



Family Verrucidae 14 



Genus Verruca 15 



Verruca (Metaverruca) coraliophila 21 



Verruca (Verruca) stromia 24 



Verruca (Verruca) laevigata 25 



Verruca (Verruca) alba 25 



Verruca (Verruca) alba caribbea 28 



Verruca (Verruca) alba barbadensis 28 



Verruca (Verruca) nexa 29 



Verruca (Verruca) floridana 31 



Verruca (Verruca) calotheca 33 



Verruca (Verruca) calotheca flavidula 34 



Verruca (Verruca) calotheca heteropoma 35 



Verruca (Verruca) xanthia -. 36 



Verruca (Verruca) entobapta 38 



Verruca (Cameraverruca) euglypta 39 



Verruca (Altiverruca) hoeki 41 



Verruca (Altiverruca) rathbuniana 41 



Verruca (Altiverruca) bicornuta 43 



Verruca (Altiverruca) darwini 45 



Verruca (Verruca) haloth^ca 46 



Verruca (Verruca) intexta 47 



Verruca (Verruca) albatrossiana 47 



Suborder Balanomorpha 47 



Family Balaninae 48 



Subfamily Balaninae 49 



Genus Balanus ; 49 



Balanus (Megabalanus) tintinnabulum 54 



Balanus (Megabalanus) tintinnabulum tintinnabulum. 55 



Balanus (Megabalanus) tintinnabulum zebra 57 



Balanus (Megabalanus) tintinnabulum spinosus 58 



Balanus (Megabalanus) tintinnabulum occator 59 



Balanus (Megabalanus) tintinnabulum volcano 60 



Balanus (Megabalanus) tintinnabulum rosa 61 



Balanus (Megabalanus) tintinnabulum azoricus 62 



VII 



