MR. А. R. HORWOOD ON CALAMITES SCHÜTZEI, ETC, 277 
On Calamites Schützei, Stur, and оп the Corres ondenee between some new 
H H 
features observed in Calamites and Equisetacem. Ву A. В. Horwoop 
(Leicester Museum). (Communicated by E. E. Lows, F.L.S.) 
(PLATES 18 & 19 and 1 Text-figure. ) 
[Read 3rd June, 1909.] 
CONTENTS, 
Page 
I. Introductory remarks. ......,... TUUM 277 
Та. Description of specimens demonstrating the fistular 
character of the pith in Calamites................ 278 
Тв. Remarks on the fistular pith-cavity of Calamites ...... 279 
П а. Description of specimens of Calamites with recurring 
short internodes, ete. .........,......., DEE 279-282 
Пс. Comparison between the position and function of the 
short internode in Calamites and recent Equiseta, 
and the rate of increase or decrease of internodes, 
ete., in both дтопрз...................... ‚эө... 286 -288 
Ш. General conclusions . 288 
I. Introductory remarks. 
WuiLsr engaged in the examination of the Fossil Flora of the Leicestershire 
and South Derbyshire Coalfield *, the writer was favoured by Mr. R. 
Emmerson, of the Ellistown Colliery, near Leicester, with a specimen of 
Calamites ( Calamitina) Schiitzei, Stur, found in close proximity to the Main 
Coal. The specimen is now in the Leicester Museum. It presents two 
characters not usually seen in pith-casts, viz.: a hollow stem f, and a 
regular succession of uniformly increasing internodes, with a marked 
recurrence of a short internode. А comparison with recent Equiseta shows 
that this last feature is common also, with some modifications, to the latter 
group. 
* Fox-Strangways, C., and A. В. Horwood: “The Geology of the Leicestershire and 
S. Derbyshire Coalfield," Mem. Geol. Surv. 1907, pp. 114-141. 
T The peculiarity of this is that, as the diagram shows, it affords graphic proof of the 
fistular nature of the pith. 
LINN JOURN.—BOTANY, VOL. XXXIX. X 
