392 Miscellaneous. 



Leucodore calcarea. 



To the Editors of the Annals and Magazine of Natural History. 



Gentlemen, — AHow me to draw your attention, and that of your 

 readers, to the figure of Leucodore calcarea appended to my paper 

 last month. I have to apologize veiy greatly for its erroneous and 

 sketchy appearance. The setae are by no means correctly indicated, 

 whilst the great branchial cirri, which curve over the back, are 

 omitted altogether. This is owing to illness, which prevented me 

 from seeing to the proofs of the plate. The figure given by Dr. 

 Johnston originally, I believe, in this Magazine, and republished in 

 the ' B. M. Catalogue of Worms,' is a very fair representation of his 

 Leucodore ciliata, which I must refer to as a correction of the erro- 

 neous one in my plate. Since my paper did not deal with the 

 morphological peculiarities of Leucodore, the figure was only of 

 secondary importance. 



I am. Gentlemen, truly yours, 



E. Ray Lankesteb. 



On the Growth of the Stem of Fontinalis antipyretica. 

 By Professor H. Leitgeb. 



The apical growth of this moss takes place by repeated divisions of 

 a three-sided apical ceU. The divisional walls afe parallel to the 

 lateral surfaces of the apical cell. The spiral of division is as often 

 directed to the right as to the left. The segments cut off' from the 

 apical cell by the divisional walls are arranged, in accordance with 

 their origin, in three longitudinal series, and at first incline towards 

 each other at an angle of about 70°. Each segment is divided by 

 a longitudinal waU into an outer and an inner part. The inner part 

 of the segment, which subsequently becomes horizontal (the stem- 

 part of the segment), displays in general the same development as 

 the segments in the roots of many vascular Cryptogamia and in the 

 stem of Equisetum. It is divided by the sextant-wall into sextants, 

 in the larger of which an inner cell is cut off' by a tangential wall. 

 From the stem-part of the segment is formed the widely cellular, 

 axile tissue of the stem. 



The outer part of the segment (the leaf-part) partially retains 

 its inclined position. It divides by a horizontal waU into the acro- 

 scopic and the hasiscopic basilar portion. The former grows out into 

 the free leaf-surface, a two-edged apical cell being formed in it. 

 From the basiscopic basilar pieces the buds are developed. Hence 

 each hud and the leaf standing above it belong to the same segment. 

 One wall of the apical cell of the bud is always turned towards the 

 apex of the parent shoot. The segmental spiral of the bud is always 

 antidromous to the segmental spiral of the parent shoot. The tan- 

 gential growth of the basiscopic basilar piece always remains much 

 behind that of the acroscopic portion. — Ameiger der AKad, der Wiss. 

 in Wien, February 13, 1868, pp. 43-44. 



