BY A. B. WALKOM. 149 



"Frond narrow, linear; pinnae short and broad, attadied to the upper face 

 of the rachis by a broad base, of which the upper corner is slightly auriculatc; 

 the apex is bluntly rounded, the tip being directed upwards. \'enation of the 

 Otozamites type." (Seward, 1900, p. 221). 



The fronds in the W-estern Australian specimens are about 3 cm. wide, 

 but as all are incomplete it is not possible to determine the length. The pinnae 

 are up to 1.7 cm. long and 7 — 8 nun. wide, with a rounded end. Their upper 

 margins have a broad lobe near the raehis, the lower margins being straiglit. 

 There are about 3 veins per mm. 



The specimen from Talgai. (^(ueensland. referred )iy Feistmantel (1890, p. 

 147) to (>. Mandelslohi (Kurr) should be placed in this species. 



This species is smaller and narrower than 0. Bechei. Apart from the size 

 and general shape there is not a great deal of difference between the fronds 

 referred to these two species. But they are fairly distinct and, though numerous 

 specimens are available, there is an absence of examples intermediate between 

 the two. 



Otozamites bexoalexsis Oldham and Morris. (Plate x., figs. 1, 2, 0). 



1803 Palaeosamia Bengaletisif. Ohlliam and Morris, Mem. Geol. Surv. Ind. 

 (Pal. Ind.), Ser. ii.. Vol. 1. Pt. 1, p. 27, PI. xix., figs. 1, 2, 6. 



This species -was originally described and figured by Oldham and Morris 

 from the lowe.st beds of the Rajmahal Group in India. 



The frond is long and narrow, with short, relatively broad pinnae. In 

 the Western Australian specimens the narrow linear I'ronds are up to about 

 1.8 cm. wide, but tlieir length is indeterminate; one specimen, 9 cm. in length, 

 is 1.8 cm. wide at its upper end and only narrows to 1.6 cm. wide at its lower 

 end. The pinnae are up to 1 cm. in length and 5 or 6 mm. in width; they 

 are obtusely rounded, but nearer the base of the frond become somewhat more 

 acute. From above, the rachis is practically hidden. The veins are divergent 

 and branch dichotomously ; at the base of the pinna there are usually — 10 

 veins, and further out they are more numerous, there being 4 to 5 per mm. 

 The upper margin of the pinna has an obtuse lobe near the ba.se; the lower 

 margin is not lobed and is overlapped to about half its length l)y the upper 

 margin of the next lower pinna. 



Comparison of the specimens with the original figures of Oldham and 

 Mon-is leaves little doubt of their identity. The species has not previously been 

 described or recorded from Australia, but I have seen specimens from near 

 Durikai. some thirty miles south-west from Warwick, Q., which I believe are 

 identical. 



It is possible that the specimens described as O. cf. Mandehlohi Kurr. 

 from the Darling Downs, near Toowoomba, Q., (Walkom, 1917, p. 23), may 

 belong to this species, though they differ somewhat in general appearance, having 

 rather broader, more orbicular pinnae. 



The specimens descril)ed above are from a locality some miles distant from 

 that in wliieh the specimens described by Arber (1910) were obtained. It is 

 not possible to tell from Arber's published notes whether any specimens with 

 the dimensions of O. hengalensis were amongst the collection submitted to him. 

 It does not seem likely, however, that he would have included specimens with 

 such narrow, elongate, linear form with O. Feistmanteli. 



Loc. — About 3 miles north of Mingenew. W.A. 



