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. 



page. 



Polypes single, naked, egg shaped, with one circle } jj yDRA 133 



of tuberculated tentacula, locomotive . . . 3 

 Polypes single, naked, conoidal, with several circles ) AcT1NIA 74 



of retractile tentacula, locomotive . . . . ) 

 Polypes, single, naked, conoidal or columnar, with } 



several circles of partially retractile tentacula, > A nthea ... 81 



locomotive j 



Polypes single, naked, egg-shaped, with scattered ) c 0RYNE ] [ 



filiform tentacula $ 



Polypes single or compound, tentacula irregular, S 



with glandular tips. Polypidom, if present, > Hermia . . . 12 



very imperfect 3 



Polypes compound, distant, united at their bases \ z 0 anthus 73 



by an encrusting trailing band S 



Polype-mass spongy, covered with stellate depres- ) Alcyonium 58 



sions <i 



* * With horny Polypidoms, external. 

 t Without cells. 



Polypidoms long, simple tubes, open at the extre- 7 Tubularia . 13 



mities 5 



Polypidoms tubular, closed at the extremities . . Fredericella . 135 



t t Cells sessile, biserial. 

 Polypidoms arborescent, formed of sub-parallel ) t hoa 15 



tubes ; cells indislinct, tubular or campanulate » 

 Polypidoms arborescent, divided into internodes ; ? Sertularia . 16 



cells distinct, with everted apertures . . • 3 

 Polypidoms arborescent, divided into internodes ; / Thuiaria. 27 



cells distinct, imbedded ) 



t t t Cells sessile, uniserial. 

 Polypidoms arborescent, with plumose branches . Plumularia. . 30 

 Polypidoms arborescent, branches in whorls round > Antennularia 28 



the stem 3 



t t t t Cells sessile, irregular. 

 Polypidoms confervoid ; cells in parallel compa- \ q ER[ALARIA 94 



nies, tubular, unilateral 3 ^ 



Polypidoms confervoid ; cells disjoined, ovate, uni- £ V esicularia. . 94 



Polypidoms confervoid : cells irregularly clustered, ) aa 



elliptical \ VALKERIA * ' Ji > 



x 



