260 
Psyche 
[September 
Plate 3 
Monsteropterum moravicum n.sp. Ventral side of the body showing long 
beak, attachment of legs to the body and tergal projections (P). Lower 
Permian, Czechoslovakia. 
and tergal elements and is vaguely preserved. It was partly removed 
to uncover the projections. 
Head structures: The character of the palaeodictyopteran mouth- 
parts, which are elongated into a beak consisting of stylets of man- 
dibles and maxillae, have been described in more detail by Crampton 
(1927) and by Laurentiaux (1952, 1953). However, there was no 
evidence about the arrangement of the stylets. Only recently Car- 
penter and Richardson (1971, p. 280) described a section of the 
beak in a strikingly unusually preserved specimen. The pair of some- 
Figure 7. Enlarged beak of Monsteropterum moravicum n.sp., ventral 
view. The beak split unevenly along median plane between two pairs of 
stylets. A-B = section of the beak figured on the block diagram in fig. 
8; E — oval elevation; L = lacinia; Ma — fragment of the maxillary 
stylet represented by the apical part of galea ; Md = natural inner surface 
of mandibular stylet where it contacts maxillary stylet; P = crescent- 
shaped pit. Lower Permian of Czechoslovakia. 
