96 CLASS IT. 



Halodactylus FARRE. Polypary fleshy, gelatinous, pellucid. 

 Polyp with tentacles 12 16, often longer on one side. 



Sp. Halodactylus diaphanus FARRE, Alcyon. gelatinosum L., ELL. Coral! . 

 PL xxxu. fig. d, ESPER, Pjlanzenth. Alcyon. Tab. xvin., FARRE Phil. 

 Trans. 1837. PI. xxv, xxvi. ; VAN BENEDEN Mech. sur Us Bryozoalves 1. 1. 

 PI. v. fig. i, 2 ; occurs on our coast (Dutch), adhering to marine plants 

 and shells resembling a gelatinous, transparent, tubular, and irregularly 

 branched sea-weed. 



Family XV. Lophopoda DUMORTIER s. Cristatellina. Tentacles 

 set pectinately on two arms, numerous. 



Cristatella Cuv. Polypary free, disciform, polypiferous on the 

 margin. 



Sp. Cristatella mucedo Cuv., Cristat. vagans LAM., EOES. in. Suppl. Tab. 

 XOI ; in fresh water ; three, four, or more Polyps are seated in a freely- 

 swimming Polypary. GERVAIS and TURPIN have figured the egg, which is 

 provided with tubular spines terminating in two or more hooks ; it bursts 

 into two valves, when the young animal is born. See Ann. des Sc. not. ie 

 Strie, vn. Zool. pp. 65 93. PL n. PL in. A. JOHNSTON, Hist. Br. Zooph. 

 p. 389. 



Plumatella nob. Polypary affixed, tubular, with extremities of 

 tubules retractile, polypiferous. 



Plume-Polyps (Polypes d, pannache TREMB.) Comp. Memoir e sur 

 TAnatomie et la Physiologic des Poly piers composes d'eau douce 

 nommes Lophopodes, par B. C. DUMORTIER. Tournay 1836. 8vo. 

 (published in part at an earlier date in the Bulletin de FA cad. des 

 Sc. de Bruxelles 1835, p. 422 &c.) Propagation occurs by eggs and 

 buds. TREMBLEY also observed spontaneous fission of the Polypary 

 in Plumatella cristata. 



Plumatella LAM. Naisa LAMOUR. Stem branched or lobate. 



Sp. Plumatella cristata LAM. ; TREMB. Polyp. Tab. x. f. 8, 9 ; the body 

 transparent, i'" long, the plume nearly of the same length ; about sixty 

 tentacles ; it lives in fresh water beneath Lemna. 



Plum, campanulata LAM. ROES. Ins. T. in. Suppl. Tab. 7375. (LiN- 

 N^EUS united this species with the former, under the name of Tubularia 

 campanulata.} Probably Plumatella repens LAM., SCHAEFFER Armpo- 

 lypen 1754 (2nd edit. 1763). Tab. I. fig. i, 2, EICHHORN Wasserthiere. 

 1781. Tab. iv. p. 43 (der Polyp mit dem Federbusch), is only a variety 

 of this. According to NORDMANN, the tube continues to grow for some 

 time after the death of the Polyp. When full-grown it has up to sixty te,n- 

 tacles, but in young animals they are less numerous, shorter and thicker. 



