OF COAL-MEASURE PLANT-IMPRESSIONS. 211 
figured, natural size, on Pl. 14. fig. 2. Here the lanceolate pinnules are 
seen partly dissected at the base into minor pinnules, a transition from the 
major to the minor type of pinnule. The apical portions are broadly 
lanceolate. 
No. 1362. An example from the Middle Coal Measures of Barnsley, 
Yorkshire, with very large major pinnules of the ovate-lanceolate type, is 
figured on Pl. 14. fig. 3, natural size. These pinnules measure 5 cm. in 
length by 2:5 em. in breadth. 
No. 1708. An example of part of a pinna with minor pinnules is shown, 
natural size, on Pl. 14. fig. 4, and enlarged in fig. 5 to emphasize the nerva- 
tion. The pinnules are here elongately oval, 2 em. in lewgth by nearly 1 em. 
in breadth. They are attached by a considerable portion of the base. A few 
of tlie basal nerves, in addition to the median nerve, arise directly from the 
rachis, The sinuous course of the subdivisions of the median nerve and their 
spacing in the centre of the leaflet are characteristic. 
No. 2793. Typical pinnules of the minor type are seen, natural size, on 
Pl. 14. fig. 6 (left-hand side), and enlarged twice in fig. 7 (left-hand side). 
This specimen is from the Middle Coal Measures of Bond's Main, Derbyshire. 
The piunules vary slightly in shape, but are elongately oval, 8 mm. or less 
iu length and 3:5 mm. or less across. They are attached by their whole 
base, somewhat decurrent, and a large part of the lower nervation arises 
directly from the rachis. The terminal pinnule is elongate and narrow. 
No. 2798. The nervation in a similar case from the same locality is also 
seen enlarged on Pl. 14. fig. 8 4. 
Diagnosis of Neuropteris obliqua, Brongn. 
Frond dimorphic, composed entirely of minor or of major pinnules, or 
containing pinnules of both types. Minor pinnules small, up to 2 em. long 
and nearly 1 em. broad, often considerably smaller, elongately oval or 
elongately triangular, more or less parallel-sided, attached to the axis by the 
whole base or, in the broader types, only by part of the base. Apical pinnule 
very large or long and narrow. Lateral nerves very elear, not very stout ; 
a considerable portion of the lateral nerves arise directly from the rachis 
and not from the median nerve. Lateral nerves very little arched, sinuous, 
each dichotomising 2-3 times, markedly distant from one another 4n centre 
ofleaf. Major pinnules very variable in size and shape, even in the same 
pinna, lanceolate (up to 2:5 x 1 em.), ovate-Janceolate (up to 5x 2:5 em.), 
oval or semicyclopteroid (about 3:5 x 2'5 cm.), sometimes very broad and 
unsymmetrical, attached to the rachis by a very small part of the base, 
which, however, is sometimes sufficiently broad to allow of the origin of 
some of the basal lateral veins directly trom the rachis. The lanceolate 
