Prof. Henfrey on the Cell-contents of Closteriuni. 419 



vermiformis, veste membranacea tubulari induta. Extremitas 

 inferior perforata. Tentacula plurima, in duabus seriebus di- 

 gesta, exteriora longa, interiora brevia. 



40. C. memhranaceus (Gmelin). Semi-pedalis. Tentacula mar- 

 ginalia omnium longissima : annulata. 



41. C.{?) vermecM/flm (Forbes). Semi-pollicaris. Cyclus ten- 

 taculorum mediocrium extra longissima. (Vestis non relata 

 est.) [Hanc non vidi.) 



Fam. V. Lucernariadse. 



Basis adhserens. Corpus crateriforme. Tentacula capitata, 

 in bcto fasciculos segregata. Discus octangularis. 



Gen. XV. Depastrum (Gosse). Corpus repente contractum, 

 et supra et infra alvum. Tentaculorum fasciculi inter angulos 

 disci positi, vix separati. 



42. D. cyathiforme (Sars). Semipallicare. Brunneum. 



Gen. xvi. Lucernaria (Miiller). Corpus expansum supra, 

 gradatim diminutum infra. Tentaculorum fasciculi in apicibus 

 angulorum positi, remoti. 



43. L. campanulata (Lamx.). Corpus campaniforme, profundum. 

 Petiolus brevis. Colore hepatico. 



44. L, auricula (Fabr.). Corpus expansum, umbelliforme, mi- 

 nime profundum. Petiolus instar corporis longitudine. Disci 

 anguli aequidistantes. Interanguli (nonnunquam) sphserulis 

 marginalibus instructi. Viridis vel rosea. 



45. L. quadricornis (Miiller). Corpus expansum, fere planum. 

 Petiolus corpore multo longior. Disci anguli in paria conglu- 

 tinati. Ligni-brunnea. 



Has species prsecedentes, figuris illuminatis ad naturam de- 

 pictis, in opere meo, ' Actinologia Britannica/ quod nunc in 

 fasciculis bimestribus publicatur, illustrare propositum est. 



XLI. — Note on the Cell-contents o/* Closterium. 

 By Arthur Henfrey, F.R.S. &c. 



The remarkable movements occurring in the interior of the cell 

 constituting the individual plant in the genus Closteiium have 

 attracted the attention of most physiologists, and have given 

 rise to much discussion. Not very long ago, it was re-asserted 

 that the movements were associated with the presence of cilia*; 



* Quarterly Journal of Microscopic Science, iii. p. 54, 1855. 



27* 



