Vol. 69.] THE CLEVELAND DISTRICT OF TORKSHIRE. 229 



portion of a small pinna. The base is seldom seen, but in a spe- 

 cimen collected by Mr. H. T. Kennedy, Trinity College, Cambridge^ 

 a portion of the rachis (or pinna-axis) is seen still attached to the- 

 pinna-base (PI. XXIII, fig. 1) ; the lamina is not well preserved,, 

 but the rachis is 3 to -i mm. thick. The pinnae were probably 

 attached to the rachis at right angles ; but their base is not clearly 

 seen, and so it is impossible to say whether it was of the unequally 

 cordate type seen in M. Tioerensis or of the more rounded form 

 seen in M. munsteri. In so far as can be made out from other 

 specimens, the bases of the pinnas were unequally rounded, and 

 approximate rather to the form seen in M. munsteri. Each pinna 

 had a stout mid-vein 1 to 3 mm. broad, and bearing fine striations. 

 The secondary veins spring from this : they are about 1 mm. 

 apart, and run out nearly at right angles to the margin, but are 

 more oblique near the apex of the pinna. They are fine, and are 

 often bifurcated near the mid-vein (PI. XXIII, fig. 2) : some of 

 them appear to be simple ; but the forking of the veins is often 

 obscured, owing to the close proximity of the mid-vein. The 

 margin of the lamina is entire. 



In some of the impressions each vein appears as if it were 

 considerably swollen : this is due to the presence of linear synaugia 

 above the veins (see PI. XXIII, fig. 3). Each synangium appears 

 to have projected somewhat above the surface, and to have had a 

 fairly firm wall enclosing a number of loculi arrranged in two 

 rows ; each loculus probably formed a projection, and imparted to 

 the synangium a corrugated appearance (PI. XXIII, fig. 5). The 

 length of the synangia is usually considerable: they often occupy 

 most of the space between the midrib and the margin, and may be 

 about 7 mm. long; but in other specimens they are shorter (4 mm.), 

 and approach M. hoerensis in this respect (PI. XXIII, figs. 4 a & 4 b). 

 When portions of the synangia are treated with Schultz's solution 

 they yield a membrane of fairly thick cells, and therefore were 

 probably firm in texture. 



On some of the remains of synangia being removed and treated 



in the usual way, 1 it was pos- 



Eig. 1. — Spores of Marattiopsis sible to make out the form of 



anglica. x800. some of the spores. The latter,. 



however, were not obtained in 



6^X l ar » e quantity, owing partly to 



-N\ \ the thickness of the synangium- 



f \ \^~*<«s*^ wall, and perhaps to the age of 

 the synangia when preservation 

 took place. The spores exhibit 

 some features of interest (see 

 fig. 1) : they are rather small, 

 measuring only about *03 mm., 

 and are rather spherical though 

 flattened on one side. Their walls appear to be densely covered 



1 For methods, see Thomas (12 1 ) p. 109. 



