8o6 



ORDER TENTACULIFERA-SUCTORIA. 



A. 



Simple. 



B. 



Com- 

 pound. 



GENERA OF TENTACULIFERA-SUCTORIA. 



Fam. I. "I Freely motile, naked I. 



Rhynchetid^. I ■' 



Animalculeswithone g^^g^^^^^^^j^^^g 2. 



or two tentacles only. ) ■" _ _ 



Fam. II. 



ACINETID^. 



Animalcules multi- ' 

 tentaculate, tentacles 

 simple. 



Fam. III. 



DENDROCOMETID/E. 



Multitentaculate, 

 tentacles branched. 



Fam. IV. 

 Dendrosomid^. 

 Animalcules multi- 

 tentaculate, forming 

 branching colonies. 



Tentacles 

 Naked. < similar. 



Motile. 



Free- , 



swimming.) -^ 



(Repent .. 4. 

 I . Affixed to a rigid^ 



I ( pedicle / ■'" 



V Tentacles dissimilar 6. 



I Tentacles dissimilar 7. 



Tentacles f Lorica sessile . . . . 8. 



similar. \ Lorica pedicellate .. 9. 



Rhyncheta. 



Urnula. 



SphcEropkrya. 



Trichophrya. 



Podophrya. 



Hemiophrya. 



Podocyathus. 



Solenophrya. 



Acineta. 



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



Colonies naked, sessile \\. Dendrosoma. 



GENERA OF TENTACULIFERA-ACTINARIA 

 Fam. I. 



Ephelotid.^. 



Tentacles simple, 



ray-like. 



Fam. II. 

 Ophryodendrid^. 

 Tentacles repre- 

 sented by one or 

 more r.etractile pro- 

 boscidiform organs. 



Animalcules naked, pedicellate I. Epheloia. 



Animalcules loricate, pedicellate 2. Adinocyathus. 



Proboscidiform organ simple 3. Acinetopsis. 



Proboscidiform organ with terminal cirri . . 4. Ophrydaidron. 



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. 



Rhyncheta 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". 



