THYLLOTHECA. 25 



4. Phyllotheca Griesbachi, Zeiller. 



1902. Phyllotheca Griesbachi, Zeiller, Pal. Indica, n.s., vol. ii, p. 30, pi. vii, 



fig. 1. 



Type. No. 7305, Mus. Geol. Surv. India, Calcutta. 



Zeiller has recently established this species on the following 

 characters: — Stem articulate, finely sulcate ; internodes 1cm. to 

 1*5 cm. long; leaves numerous, 20 to 25 mm. long, united at the 

 base to form a sheath 1 cm. long ; free segments linear and 

 acuminate ; sheath contracted at the base, but lax distally, and 

 expanding into an almost horizontal disc. 



The single specimen, described by Zeiller, shows three stems 

 arranged side by side, which may be three secondary branches 

 springing from the successive internodes of a primary axis. There 

 appear to have been some 30 or 40 leaves in each whorl, which are 

 erect near the base, but rapidly spread outwards in an almost 

 horizontal direction. The sheath is lax in this species. 



Zeiller remarks that this species offers some comparison with that 

 described from the Lower Tunguska (Siberia) by Schmalhausen 1 

 as P. equisetitoides. In the latter species, however, the dimensions 

 of the stems are much greater, and the leaf-sheaths are closely 

 applied to the stem throughout the entire length of the internode. 



The general character of the disc of P. Griesbachi is similar to 

 that of the Phyllotheca described by Etheridge 2 from New South 

 "Wales (see p. 26), but in the Australian plant the free segments 

 are reduced to short teeth. 



Phyllotheca Griesbachi is only known from the Barakar Group 

 of the South Rewah basin, India. 



Not represented in the British Museum collection. 



5. Phyllotheca robusta, Feistmantel. 



(Text-fig. 8.) 



1880. Phyllotheca robusta, Feistmantel, Flora Goudw. Syst., vol. iii, pts. 2, 3, 

 p. 68, pi. xivA bis, figs. 1, la, and 2. 



Type. Nos. 5161-2, Mus. Geol. Surv. India, Calcutta. 



Stems branched ; branches slender, articulated, finely striated. 

 Free leaf-segments 10-14, lanceolate, united at the base into 

 a sheath ; longitudinally striated, with an indistinct midrib. 



1 Schmalhausen (79), p. 71, pi. xii, figs. 1—1. 



2 Etheridge (95), p. 148, pi. xvii ; pi. xviii, fig. 3. 



