The following Synopsis of the GENERA of Zoophytes is arranged 
so as to assist Persons, unacquainted with the subject, to identify 
them by considering the external forms only. 
* No Polypidom. 
of tuberculated tentacula, locomotive 
of retractile tentacula, locomotive . . . . 
Polypes, single, naked, conoidal or columnar, with 
several circles of partially retractile tentacula, 
locomotive 
Polypes single, naked, campanulate ; tentacula in 
distant tufts, locomotive 
Polypes single or compound, tentacula irregular, 
with glandular tips. Polypidom, if present, 
very imperfect • • 
Polypes compound, distant, united at their bases 
by an encrusting trailing band 
t Without cells. 
Polypidoms long, simple tubes, open at the extre- ? 
mities J 
Polypidoms tubular, closed at the extremities . . 
t t Cells sessile, biserial. 
Polypidoms arborescent, formed of sub-parallel) 
tubes ; cells indistinct, tubular or campanulate ( 
Polypidoms arborescent, divided into internodes;? 
cells distinct, With everted apertures . . • ) 
Polypidoms arborescent, divided into internodes;? 
cells distinct, imbedded 
1 1 t Cells sessile, uniserial. 
Polypidoms arborescent, with plumose branches . 
Polypidoms arborescent, branches in whorls round ) 
the stem ) 
t t 1 1 Cells sessile, irregular. 
Polypidoms confervoid ; cells in parallel compa- 
nies, tubular, unilateral 
elliptical 
Hydra . . . 
page. 
. 136 
Actinia . . 
. 74 
Anthea . . 
. 81 
Lucernaria. 
. 83 
CORYNE . , 
. 11 
Hermia . 
. 12 
ZOANTIIUS 
. 73 
Alcyonium . 
. 58 
al . 
Tubularia . 
. 13 
Fredericella 
. 135 
• Thoa . . . 
. 15 
Sertdlaria. 
. 16 
Thuiaria. . 
. 27 
Plumularia. 
. 30 
Antennularia 
00 
CM 
- Serialaria . 
. 94 
• Vesicularia. 
. 94 
- Valkeria . 
. 95 
X 
