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. 



— $©*••— 



* A T o Polypidom. 



Polypes single, naked, egg shaped, with one circle ? „ 



of tuberculated tentacula, locomotive . . . > 

 Polypes single, naked, conoidal, with several circles ) . 



of retractile tentacula, locomotive . . . . S 

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



several circles of partially retractile tentacula, > Anthea . 



locomotive 3 



Polypes single, naked, campanulate ; tentacula in ) t ucernari1 



distant tufts, locomotive \ 



Polypes single, naked, egg-shaped, with scattered > c ORYNE 



filiform tentacula S 



Polypes single or compound, tentacula irregular, ) 



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



very imperfect ) 



Polypes compound, distant, united at their bases 1 Zoanthus 



by an encrusting trailing band S 



Polype-mass spongy, covered with stellate depres- ) «,„„„«„,„ 



sions S 



* * With horny Polypidoms, external. 



t Without cells. 



Polypidoms long, simple tubes, open at the extre-) Tubcjlaria 13 



mities .....5 



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



t t Cells sessile, biserial. 

 Polypidoms arborescent, formed of sub-parallel ) j, ic 



tubes ; cells indistinct, tubular or campanulate S 

 Polypidoms arborescent, divided into internodes;? Sertularia 16 



cells distinct, with everted apertures . . • j 

 Polypidoms arborescent, divided into internodes;/ „, - 



cells distinct, imbedded $ Thucaria. . . 27 



t t t Cells sessile, uniserial. 



Polypidoms arborescent, with plumose branches . Plumularia. . 30 



Polypidoms arborescent, branches in whorls round > A OQ 



the stem. . . . J Antennularia . 28 



t t t t Calls sessile, irregular. 

 Polypidoms confervoid ; cells in parallel compa- ) ^ q^ 



nies, tabular, unilateral } >-eria aria 



Polypidoms confervoid ; cells disjoined, ovate, uni- ) , T nA 



lateral .............. . \ Vesicularia. . 94 



Polypidoms confervoid ; cells irregularly clustered, / _ r Qti 



elliptical S VALKERIA ' • yi> 



x 



page. 

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