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DR. D. H. SCOTT: NOTES ON CALAMOPITYS. 205 
Notes on Calamopitys, Unger. By D. H. Scorr, F.R.S., F.L.S. 
(PrATES 6-8 and one Text-figure.) 
(Read 15th November, 1917.] 
CONTENTS. 
Page 
INTRODUOTION NA E be vss 'sls edes nnn eral dE DERI 205 
I. Tux Lrar-rRACE OF Calamopitys americana... eee eee 206 
II THE Genus (Clemons. 3 rero ire LA LE OERTOAN 209 
Calamopitys annularis ............ E E Lo occa N 210 
Calamopitus OR o's. hoes nnn eraran EID 215 
Calamopit/s amentoata, o.. ooo eee so QURE oe 218 
Calamopitus fasciatlaris o. 5. occ o OE 218 
Calamoptiys vBeweortiana, .. «s.aicicirioiszigesssisicnn a se CEE o 219 
SYNOPSIG si...» re ue EID PICT Gore's. oc s/o» DEDE 221 
Affinities -of the Specionlle 00... S ... 222 
Affinities of the Genus Lese a a 226 
du e A o as. ss o's oes | OS 00 0 15 S ou 229 
LITERATURE OITED ....... QE ets. : soc oe CUERO 230 
EXPLANATION OF THE PLATESEE reo os eee e 231 
INTRODUCTION. 
Five species of Calamopitys, of Lower Carboniferous or possibly in some 
cases of Upper Devonian age, have been described : two, C. Saturni, Unger 
and C. annularis (Unger), from Thuringia (Unger, 1856 ; Solms, 1896) ; 
one, C. Beinertiana (Goepp.) from Silesia and from Scotland (Solms, 1893 ; 
Scott, 1902) ; one, C. fascicularis, Scott, from Scotland and England (Scott, 
1902) ; and one, C. americana, Scott & Jeffrey, from the State of Kentucky 
(Scott & Jeffrey, 1914). 
The two species C. Beinertiana and C. fascicularis, which I was responsible 
for referring to Calamopitys, have been placed by Dr. Zalessky in a separate 
genus, Fristophyton (Zalessky, 1911). The object of the present Notes is 
firstly to put on record some fresh evidence as to the course of the leaf-trace 
in C. americana, and secondly to discuss the relations of the various species, 
with special reference to Dr. Zalessky's proposed division of the genus. 
It will be remembered that Calamopitys is a genus of Cycadofilices *, with 
a stem-structure comparable to that of Lyginopteris, for the pith is sur- 
rounded bya ring of mesarch primary strands of xylem. Their structure, 
however, is usually more centrally mesarch than in Lyginopteris. The 
leaf-trace is a single strand at its origin, but divides further out, in all cases 
* Used here in preference to “Pteridosperms” because there is no evidence whatever as 
to the fructification. 
LINN. JOURN.—BOTANY, VOL. XLIV. S 
T MONEDAS X x UTOR 
WOO WS 
