100 VERTEBRARIA. 



breadth, with a well-marked, somewhat flattened median ridge, 

 formed by the compression of a median series of areas. The 

 transverse ridges and grooves of the lateral areas alternate on 

 either side of the ridge, and occur at very unequal distances from 

 each other. On the right-hand side of the specimen as seen in the 

 figure, the oblong areas between the four transverse grooves overlie 

 the areas of the median ridge. Four transverse ridges are also seen 

 which appear to correspond with the transverse ridges of the 

 median series, whereas the grooves do not correspond. On the 

 left-hand side three ridges and grooves are seen. The longitudinal 

 ridge is flattened over some of the areas on this side. 



Port Stephens. Odinheimer Coll. 



V. 7212. PI. IV, Fig. 4. 



A specimen showing two fragments of Vertebraria, of which one 

 is figured here. There is no longitudinal groove or ridge, but 

 a median series of areas, which is overlapped by both the lateral 

 rows of areas. The transverse furrows of the median series do 

 not correspond with those of either of the lateral series. Three 

 ridges are seen in the median row. As figured here, the right-hand 

 lateral series shows five areas, and the left-hand three, on which 

 well-marked, but distant strife occur. 



Port Stephens. Odinheimer Coll. 



V. 4286. Two series of areas, separated by a median groove, are 

 seen in this specimen for a considerable portion of its length, but 

 at one end there is simply a single row of larger areas, which are 

 striated longitudinally. 



Port Stephens. Odinheimer Coll. 



V. 7210. A small piece of a rhizome, showing a longitudinal 

 groove and two series of areas with transverse ridges and grooves. 

 The areas are faintly striated longitudinally. Fragments of scale- 

 fronds are associated with this specimen. 



Port Stephens. Odinheimer Coll. 



V. 7209. A specimen of Vertebraria, some 9 cm. in length. 

 The longitudinal groove is indistinct, but there are two series of 

 areas, with well-marked transverse grooves and ridges. The areas 

 are also striated longitudinally, the striae being fairly distant from 

 each other, about I mm. apart. Several fronds of Glossopteris 

 Browniana are also associated. 



Port Stephens. Odinheimer Coll. 



