8o6 



ORDER TENT A CULIFERA -S UCTORIA . 



B. 



Com- 

 pound. 



Fam. III. 



j^DRO. Animalcules sessile, with an indurated cuticle. 10. 

 Multitentaculate, 



tentacles branched. J 



Dendrocometcs. 



Fam. IV. 



DENDROSOMID^E. 



Animalcules multi- 



tentaculate, forming 



branching colonies. 



Colonies naked, sessile \\.Dendrosoma. 



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". 



