POLYPI. 533 



Dujardin termed the animal in this condition Clado/iema 

 radiatum. These now free Medusae were competent to pro- 

 cure abundant food for themselves by means of their 

 branched arms, and their development proceeded, during 

 which their 8 10 tentacles became still further branched. 

 These Cladonemata were either attached by the bell, and 

 allowed their tentacles to float in the water, or retained 

 themselves by the tentacles, or swam about in the water 

 by the sudden contractions of the bell. Dujardin has pro- 

 posed to place this Cladonema near Oceania, Tltaumantias, 

 and Cytcels ; the Reporter, however, is inclined to suppose 

 that its metamorphosis was not yet completed. 



POLYPI. 



The Bryozoa have again received an accession of some 

 new genera and species. Allman (Institut, 1843, p. 454) 

 admits two varieties of Plumatella repens according as the 

 polypidom is affixed on larger broad bodies, or on smaller 

 objects, and is then necessarily closely compressed. He 

 (Annals Nat. Hist, xiii, 1844, p. 328) enumerates the 

 following among the fresh-water Bryozoa [zoophytes] of 

 Ireland : Cristatella mucedo, Alcyonella stagnorum, Plumatella 

 repens, with two other new species, PI. emarginata and 

 fruticosa, further Fredericella sultana, to which is added 

 also the new species, Fr. dilatata and Paludicella articulata ; 

 lastly, Allman adds an entirely new hydroid zoophyte [occu- 

 pying a position between Coryne and Hermia] which he 

 describes as a distinct genus under the name of Cordij- 

 lophora lacustris. The polypidom of this Bryozoon is horny 

 and branched, rooted by a creeping tubular fibre, branches 

 tubular. Polypes developed at the extremity of the 

 branches ovoid, bearing the mouth at the distal extremity, 

 and furnished with scattered filiform tentacula. Another 

 new genus has been added to the Bryozoa by Van Benedeu 

 (Bulletin de 1'Acad. Roy. de Bruxelles, t. ii, 1844, p. 385) 



