liv 



INTRODUCTION. 



TABLE I. ATHECATA. 



Hydroida with a polypary, but without true calych'S. 



Genera. 



i I Polypites solitary 2 



' I Polypites associated 3 



(Tentacles capitate and scattered 



2. < over the body MYBIOTHELA. 



( Tentacles filiform, in two circles , . COBYMOBPHA. 



q j Tentacles of two kinds 4 



1 | Tentacles of one kind 7 



i Upper tentacles capitate; lower 

 without capitula, rigid 5 

 Upper tentacles capitate j lower 

 filiform and flexile 6 



(Capitate tentacles in a single cru- 

 ciform verticil CLADONEMA. 



' i Capitate tentacles in several cruci- 

 ( form verticils STAUBIDIUM. 



I Stem simple VOBTICLAVA. 



' I Stem branched ACHABADBIA. 



j I Tentacles capitate 8 



' j Tentacles filiform 11 



( Tentacles scattered or in several 



8. < whorls 9 



{ Tentacles in a single whorl CLAVATELLA. 



n I With free medusiform gonozooids 10 

 ' I Without free gonozooids COBYNE. 



-,n \ Polypary composed of two coats . . ZANCLEA. 



| Polypary simple SYNCOBYNE. 



-, -, \ Tentacles in two separate circles . . 12 

 ' | Tentacles scattered or in one circle 13 



i i) \ With free medusiform gonozooids . ECTOPLEUBA. 



| Without free gonozooids TUBULABIA. 



13. 



I Tentacles scattered 14 



j Tentacles in a single verticil 



17 



