144 Leuckart: Bericht über die Leistungen in der Naturgeschichte 
4. Paludicellea. Polypide completely retractile; evagination of 
tentacular sheath imperfect. 
5. Cycelostomata. Polypide completely retractile; evagination 
perfect; orifice of cell destitute of moveable appendage. 
(Adde: Position of the orifice of the cell terminal. Cells 
arise by gemmation one from the other.) 
6. Ctenostomata. Polypide completely retractile; evagination 
perfect; a circle of setae attached to the invertible por- 
tion and acting as an opereulum in the retracted state. 
(Adde: orifice terminal. Cells arise each separately from 
a common tubular stam, with whose cavity that of the cells 
communicates.) 
7. Cheilostomata. Polypide completely retractile ; eyagination 
perfect; orifice of the cell with a moyeable lip. (Adde: 
Position of the orifice of the cell sub-terminal. Cells arise 
by: gemmation one from another.) 
(Die Zusätze sind nach den Bemerkungen des Recensenten in 
dem Journ. mier. Sc. VI. p. 36 hinzugefügt.) 
Die Süsswasserformen vertheilen sich dabei folgendermaassen : 
Lophopea: 
Fam. Cristatellidae. Conoeeium free, locomolive. 
Gen. Cristatella Cuv. Conoecium sacciform, hyaline, with 
a common flattened dise adapted for locomotion; orifices placed on 
the surface opposide to the disc, and arranged in several concentrie 
marginal series. Statoblasts orbicular, with an annulus and marginal 
spines. 
Sp. Cr. mucedo Cuyv. (= Cr. mirabilis Dal.) 
Fam. Plumatellidae. Conoecium rooted. 
Gen. Pectinatella Leidy. Lophophore with two long arms, 
Conoecium massive; ectocyst gelatinoid ; statohlast orbieular, with 
marginal spines. 
Sp. P. magnilica Leidy. 
Gen. Lophopus Dum. Lophophore with two long arms, 
Conoecium saceiform; ectocyst gelatinoid; statoblasts oval, destitute 
of spines. 
Sp. L. erystallinus Pall, 
Gen. Aleyonella Lam. Lophophore with two long arms. 
Conoecium tubular, tubes united ; ectocyst pergamentaceous. 
Sp. Alec. fungosa Pall., Alec. Benedeni Allm., Alc. fabellum 
van Ben. 
Gen. Plumatella Lam. Lophophore with two long arms. 
Conoecium tubular, tubes distinet; ectocyst pergamentaceous. 
Sp. Pl. repens Linn, (= Pl. nitida Leidy ?) Pl. strieta Allm. 
(= Pl. repens van Ben.), Pl. punctata Hank. ,, Pl. vesieularis Leidy, 
Pu 
