554 Mr. D. Sharp and Mr. F. Muir ov the Comparative 
A, maritimus (Pl. LXX fig. 180). 
Median lobe short, tubular, continued from the dorsal basal part 
as a single broad strut (ms); median orifice at apex, the chitin- 
isation on the dorsal face (b) continuing on to the sac, ventral edge 
of orifice projecting beyond dorsal. Tegmen forming a large cap- 
piece pointed at apex with the basal lateral edges turned in to 
form a groove in which the median lobe plays; from the base 
proceed a pair of divergent struts (c), consolidated at their bases. 
Internal sac undifferentiated. 
The cap-piece without lobes and the undifferentiated 
internal sac induce us to place this also in Cucujoidea. 
The tegmen is however of peculiar form. 
Family ORDEMERIDAE. 
Forms examined: Oncomera femorata Fabr., England. 
Copidita (Sessimia) punctwm Macl., Australia. Dohrnia 
miranda Newm., Australia. 
Figs, 181, 182 and 183, Pl. LXX. 
Oxncomera femorata (Pl. LXX fig. 181). 
Median lobe long, pointed and flattened laterally, bent up at the 
base, where the dorsal and ventral edges of the median foramen 
project, the ventral one being flattened out and serving for the 
attachment of muscles ; median orifice on ventral face near tip; on 
each side near tip there is a stout, sharp spine. Tegmen consisting 
of a plate coming to two points at the distal end, and T-shape at 
base, the arms of the T curving up and embracing the median lobe ; 
the first connecting membrane attaching the median lobe to the T- 
shape piece of tegmen. Internal sac undifferentiated. 
Copidita punctum (Pl. LXX fig. 182). 
This is on the same plan as Oncomera, but the tegmen is round at 
the apex with a slight indentation at its tip and two small recurved 
spines a little before the tip, on the dorsal aspect. 
Dohrnria miranda (Pl, LXX fig. 183). 
Median lobe flattened laterally and pointed at apex, the median 
orifice being situate on the ventral aspect far from the apex 
Tegmen forming a large sheath, membranous or ventral (?) aspect 
and chitinous on dorsal (?). Internal sac undifferentiated. The 
position of the tegmen on the dorsal side of the median lobe does 
not agree with other Oedemeridae we have examined; but this 
requires more detailed investigation. 
