86 prof. a. c. seward : contribution to [March 1913, 



of elongated rectangular cells are clearly preserved (PI. XI, fig. 1 b). 

 The internode is longer than in previously-recorded specimens 

 referred to this species. 



In its slender dimensions, and in the form of the leaf-sheath, the 

 fossil agrees generally with Mantell's species ; but it differs in the 

 greater elongation of the internode from the majority of specimens 

 recorded from America, 1 Germany, 2 and elsewhere. It is essentially 

 similar in form to the shoots of existing members of the genus, and 

 of narrower diameter than the common Jurassic species, Equisetites 

 columnaris Brongn. A very similar type is represented by E. vir- 

 ginicum Font., 3 which Mr. Berry believes to be identical with 

 Bunker's species, E. burchardti : while expressing some doubt as to 

 the correctness of this view, I must admit that the line of demar- 

 cation between E. Iyelli and E. burcliardti is not very clearly 

 defined. 



Some specimens described by Dr. Neumann i from Peru as 

 E. Iyelli, whether or not correctly determined, appear to be of 

 the same general type as that species. 



LYCOPODIALES. 

 Lycopodites teilhardi, sp. nov. (PL XI, figs. 2 a & 2 h.) 

 (Fairlight Clay, Fairlight ; Dawson Coll.) 



The fragment shown in fig. 2 a consists of a slender forked axis 

 bearing two rows of alternate oval leaves, 8 mm. long, with a 

 median vein. Superposed on the axis there appears to be a row of 

 rather smaller leaves, a few of which are seen in fig. 2 6. The 

 faint stain on the rock made by the short and broad leaves suggests 

 comparison with the thin lamina of many species of Selaginella, 

 and the apparent occurrence of dimorphic foliage points in the 

 same direction. 



Despite the probability that the specimen is more closely related 

 to JSelaginella than to the genus Lycopodium, the generic name 

 Lycopodites is adopted in preference to Selaginellites, in con- 

 formity with Prof. Zeiller's suggestion 5 that the latter designation 

 should be reserved for plants in which heterospory has been 

 demonstrated. 



An American species, originally recorded by Fontaine 6 and more 

 recently described by Mr. Berry 7 from the Patapsco Formation 

 (Potomac) of Maryland as Selaginella marylandica, agrees closely 

 with L. teilhardi, except in the absence of any indication of 

 heterophylly. 



1 Berry (11=) p. 311 & pi. xli, figs. 7-8. 



2 Schenk (71) p. 207 & pi. xxii, figs. 10-13. 



3 Fontaine (89) pis. i & ii ; Berry (IP) p. 310. 

 1 Neumann (07) p. 77, & pi. i, fig. ± 



5 Zeiller (06) p. 141. 



6 Fontaine in Ward (05) pi. exv, figs. 9 & 10. 



7 Berry (ll 2 ) p. 307 & pi. xli, figs. 1-2. 



