THE 
GEOLOGICAL MAGAZINE. 
NEW. SERIES. DECADE” Il “VOLE VA 
No. VII.—JULY, 1888. 
@2E kG SIN AS Ee eAGr: ik Giese Si 
er 
I.—Woopwarpian Muszeum Notes. On CazAmMirEs UNDULATUS 
(Sternb.). 
By AuBert C. Sewarp, B.A., F.G.S., 
Foundation Scholar of St. John’s College, Cambridge. 
(PLATE IX.) 
T the end of his monograph on the structure of Calamites, Prof. 
Williamson makes the following remark :'—‘“ I am disposed 
to regard all existing specific names and definitions as worthless. 
They separate things that I believe to be identical, and confound 
others that are obviously distinct.” The specimen described below 
affords an interesting example in support of this view. 
Sternberg founded the species undulatus on specimens with undu- 
lating ribs, which he figured in the “ Flora der Vorwelt.”* In the 
« Prodrome d’une Histoire des végétaux fossiles,” Brongniart includes 
this species in his list of Calamites. 'The same author describes C. 
undulatus in his later work,* but suggests, however, that it may be a 
variety of Calamites Suckowit. 
Kttingshausen* recognizes the impossibility of separating the 
different species of Calamites, and includes Calamites undulatus, C. 
Suckowii, C. equalis, and many others under one species, C. communis. 
Schimper ° considers the flexuous character of the ribs and furrows 
of Calamites to be due*to vertical pressure, and attaches no specific 
importance to it. 
Dawson ° retains the species undulatus, because certain specimens 
show the reticulate markings on the surface similar to those repre- 
sented in Brongniart’s figures; the undulating character of the ribs 
he considers may perhaps be an indication of vertical pressure. 
Mr. Kidston’ does not include the species in his catalogue; he 
1 Phil. Trans. Royal Soc. 1881, On the Organization of Fossil Plants of the 
Coal-measures, pt. i. Calamites, p. 507. 
2 Versuch einer Geognostisch-botanischen, Darstellungen der Flora der Vorwelt. 
vers. i. p. 47, pl. i. fig. i. pl. xx. fig. 8. 
3 Hist. des vegét. fossiles, tome i. p. 127. 
* Die Steinkohlenflora yon Radnitz in Béhmen, Abhandlungen der Kais. Konig- 
lichen Geologischen Reichsanstalt, ii. Band, 3 Abth. No. 3, p. 26. 
° Traité de Paléontologie végétale, tome i. p. 313. 
6 Report on the Fossil Plants of the Lower Carboniferous and Millstone Grit 
Formations of Canada, Geol. Survey of Canada, p. 30. 
7 Catalogue of the Paleozoic Plants in the British Museum, p. 25. 
DECADE III.—VOL. Y.—NO. VII. 19 
