ON FRESHWATER POLYZOA. 327 
1766. La seconde sorte de Polypes a Bouquets. Ledermuller, Amusm. Mice. 
Qde cing. p. 94. pl. 87. (The figures are imperfect copies from 
Résel.) 
- 1798. Cristatella mucedo. : Cuvier, Tab. Elém. p. 656. 
1816. Cristatella vagans. Lamk. An. sans Vert. Ist edit. vol. ii. p. 97. 
1817. Cristatella mucedo. Cuv. Régne An. Ist edit. vol. iv. p. 68. 
1820. Cristatella vagans. Schweigger, Handbuch der Naturg. p. 423. 
1824. Cristatella vagans. Lamouroux, Enc. Méth. Zooph. 1824. p. 226. 
pl. 472. (Figures copied from Résel.) 
1824. Cristatella vagans. Goldfuss, Naturhistorisch. Atlas, (Fig. copied 
from Résel.) 
1828. Aleyonella, secundus evolutionis gradus. Raspail, Hist. Nat. de 
_ TAleyon. fluv., Mém. de la Soc. d’Hist. Nat. de Paris, vol. iv.p.129. 
1830. Oristatella mucedo. Cuvier, Rég. An. 2nd edit. vol. iii. p. 296. 
1834. Cristatella mirabilis. Dalyel, Rep. Brit. Assoc. an. 1834. p. 604. 
and Edin. New Phil. Journ. vol. xvii. p. 414. 
1834. Cristatella vagans. De Blainville, Man. d’Act. p. 489. pl. 85. fig. 7. 
(Fig. copied from Rosel.) 
1834. Cristatella vagans. De Blainville, Dict. Sc. Nat. Art. Cristatelle, 
fig. 7. (Fig. copied from Rosel.) 
1836. Cristatella vagans. Lamarck, An. sans Vert. 2nd edit. vol. ii. p. 110. 
1837. Cristatella mucedo. Turpin, Ann. Sc. Nat. 2nd series, tom. vii. p. 65. 
pl. 2,3. (Original figures. ) : 
1837. Cristatella mucedo. Gervais, Ann. Sc. Nat. 2nd series, tom. vii. p. 77. 
pl. 4. (Original figures. ) 
1838. Cristatella mucedo. Johnston, Brit. Zooph. 1st edit. p. 308. pl. 43. 
(Figures copied from Turpin.) ; 
1839. Cristatelia mucedo. Gervais, Aun. Franc. et Etrang. d’Anat. tom. iii. 
- 133. 
1840. Cristatelle moisissure. Gervais, Dict. Sc. Nat. Suppl. Art. Al- 
cyonelle, Planches Supplémentaires, Pol. fluviatiles. (Original 
figures. ) 
1843. Cristatella mucedo. Thompson, Rep. Brit. Assoc. an. 1843. p. 285. 
1844. Cristatella mucedo. Allman, Ann. of Nat. Hist. vol. xiii. p. 330. 
1846. Oristatella mucedo. Allman, Rep. Brit. Assoc. an. 1846. Trans. of 
Sect. p. 88. 
1847. Cristatella mucedo. Johnston, Brit. Zooph. 2nd edit. p. 387. pl. 73. 
(Fig. copied from Turpin.) ~ 
1848. Cristatella mucedo. Van Beneden, Bryoz. Fluv. de Belg. p. 16, 
Mém. de l’Acad. Roy. de Belgique, 1848. 
1849. Cristatella mirabilis. Dalyell, Rare and Remarkable Animals of 
Scotland, vol. ii. (Original figures.) 
The original figures are those of Rosel, Turpin, Gervais, Ann. Se. Nat., 
Gervais, Dict. Sc. Nat. Suppl., and Dalyell. 
Distribution—Germany, France, Belgium, England, Scotland, Ireland. 
Genus 2. Lopnorus, Dumortier (1835). 
Gen. Char.—Ceeneecium sacciform, hyaline, with a dise which serves for 
attachment but not for locomotion; orifices scattered. Lophophore cres- 
eentic. Ova elliptical, with an annulus, but without marginal spines. 
Species unica*. Lophopus crystallinus, Pallas. 
_ Spec. Char.—Same as that of the genus. 
* T have not been able to find sufficient grounds for viewing the L. Bakeri, Van Beneden, 
as a distinct species. 
