8o6 



ORDER TENTACULIFERA-SUCTORIA. 



A. 



Simple. 



GENERA OF TENTACULIFERA-SUCTORIA. 



Fam. I. ■) Freely motile, naked 1. 



RHYXCHETID.'E. I ' 

 Animalcules with one I g^j^j^l^^^^,^ 2_ 



I ^^^^- \ %. 

 Motile. < swimming. J -^ 



Naked. I similar. | ^jg^^^ tf T"rigid| \ 



1 { pedicle / ^' 



V Tentacles dissimilar 6. 



or two tentacles only. J 



Fam. II. 



ACINETID^. 



Animalcules multi- ' 



tentaculate, tentacles 



simple. 



Tentacles ' 

 ( similar. 



I Tentacles dissimilar 7- 

 Tentacles ( ^°"'-^ ^^^''^ •• •• ^• 

 similar. \ Lorica pedicellate .. 9. 



Rhyncheta. 



UrTtula. 



Spharophrya. 



Trichcphrya. 



Podophrya. 



Hemiophrya. 



Podocyathus. 



SoUnophrya. 



Aciiuta. 



B. 



Com- 

 pound. 



Fam. III. " 



DENDROCOMETID.t. 



Multitentaculate, 

 tentacles branched. , 



Fam. IV. ' 



Dendrosomid.t. 

 Animalcules multi- ; 

 tentaculate, forming 

 branching colonies. ' 



Animalcules sessile, with an indurated cuticle. 10. Dendrocomttes. 



Colonies naked, sessile \\. Dendrosoma. 



GENERA OF TENTACULIFERA-ACTINARIA. 

 Fam. I. 



EPHELOTIDvE. 



Tentacles simple, 



ray-like. 



Fam. II. 

 OrHRYODENDRID.t. 

 Tentacles repre- 

 sented by one or 

 more tetractile pro- 

 boscidiform organs. 



Animalcules naked, pedicellate 1. Ephelota. 



Animalcules loricate, pedicellate 2. Actinocyathus. 



Proboscidiform organ simple 3. Adnetopsii. 



Froboscidiform organ with terminal cirri . . 4. Ophrydendron. 



Order I. TENTACULIFERA-SUCTORIA. 



A greater or less proportion of the tentaculate appendages suctorial in 

 character, usually capitate, and adhesive only at their distal extremities. 



Genus I. RHYNCHETA, Zenker. 



Animalcules motile or temporarily attached, stalkless, consisting of a 

 more or less ovate body, bearing at the anterior extremity a single long, 

 essentially suctorial tentacle. Hab. — Epizoic. 



Rhjmcheta cyclopum, Zenker. Pl. XLVI. Figs, i and 2. 



Body freely motile, contractile, usually when extended elongate-conical, 

 three or four times as long as broad, widest and more or less truncate 

 posteriorly, attenuate and pointed anteriorly, and continued into a long, 

 slender, flexible and retractile tentacle-like sucker, which may be extended 

 to two or three times the length of the body ; endoplast broadly ovate, 

 central ; contractile vesicle situated between the endoplast and the anterior 

 extremity. Length of extended body 1-165". 



