88 LACCOPIEEIS. 



Habit most probably like tbat of Laceopteris polypodioides. 

 Frond digitate, divided into spreading pinnatifid branches with 

 linear ultimate segments. TJltimate segments traversed by 

 a prominent midrib giving off secondary veins at a vdde angle; 

 these veins anastomose and form a series of comparatively broad 

 meshes on each side of the midrib. From the outer edge of these 

 meshes arise numerous tertiary veins joined to one another 

 by oblique cross-connections. Sori circular, probably without an 

 indusium, borne in two rows, one on each side of the central rib. 



This species is represented by an abundance of pinnule fragments 

 in the Inferior Oolite of Stamford and other places. It is 

 impossible to give a complete diagnosis of this type, but it agrees 

 closely with Laecopter is polypodioides,'^ Brongn., except in the more 

 numerous tertiary veins in the ultimate segments ; the sori are in 

 two rows parallel to the midrib, and of circular form. In habit 

 the fronds were no doubt like those of Laceopteris polypodioides, 

 and very similar to those of the recent Matonia pectinata. In all 

 probability some fragments from the Perucer Beds of Bohemia 

 recently figured by Fric & Bayer '' as JDrynaria should be referred 

 to Laceopteris. 



One of the specimens (20,040i) in the Museum collection 

 includes a fragment of what is probably the rachis, showing the 

 form of the petiolar vascular strand, which agrees with that of 

 Matonia in being broadly U-shaped, with the ends of the arms bent 

 inwards at right angles. In another specimen the edges of the 

 lamina of the pinnules are seen to be strongly revolute. 



The Jermyn Street Museum collection includes some good 

 specimens from Stamford, and in the Northampton Museum I have 

 seen fragments of the same species from the Lincolnshire Limestone 

 of EothweU, near Kettering. 



V. 4646. Fertile pinnules. 



Collyweston Slate. C. W. Peach Coll. 



20,040c, 20,040<?. Fragments of pinnules ; a section of a rachis (?) 

 seen in 20,040(?. 



Weekley, Northants. Miss Baker's Coll. 



1 Seward (00), p. 78, pis. xii.-xiii. ; text-figs. 8-11. 

 ' Fric & Bayer (01). 



