564 Mr. D. Sharp and Mr. F. Muir on the Comparative 
Orina speciosa. 
Median lobe forming a long, fairly slender tube, slightly curved ; 
ventral edge of median orifice bluntly pointed, turned down- 
ward and projecting slightly beyond the dorsal edge, which is 
rounded and turned upward; median foramen occupying the 
ventral face of the basal sixth. Tegmen forming a V-piece, not 
meeting on dorsal aspect and without any trace of cap-piece. In- 
ternal sac nearly as long as the median lobe with a fairly thick 
flagellum arising from the apex, and through which the ejaculatory 
duct passes, nearly as long as the sac. 
Gastrophysa raphani. 
Median lobe very short and broad ; the ventral edge of median 
orifice pointed and projecting beyond the dorsal edge; the dorsal 
edge forming a flat fold, or lid, over the orifice, thus giving it 
a horse-shoe shape. Tegmen forming a V-shaped piece on ventral 
aspect of the median lobe. Sac not examined. 
Chrysomela sharpt. 
Median lobe well developed and chitinised, with the ventral 
edge produced somewhat beyond the dorsal edge and rounded, 
the median foramen occupying about one-sixth of the ventral basal 
portion. Tegmen forming a semi-ring without trace of cap-piece. 
Internal sac large, with a curved, slender flagellum on which the 
ejaculatory duct opens. 
Paropsis variolosa? (from Sydney) (Pl. LXXIV figs. 210, 
210a). 
Median lobe well developed and chitinised and flattened horizon- 
tally ; the ventral margin of the median orifice bluntly pointed and 
produced far beyond the dorsal edge, thus placing the orifice in a 
dorsal position ; median foramen occupying one-sixth of the basal 
ventral portion, which is slightly constricted off from the distal 
five-sixths, The chitinisation of the dorsal edge of the median 
orifice is continued on to the base of the internal sac as two short 
broad strips (a). Tegmen forming a slender semi-ring-piece, with 
only a minute strut (s) and not meeting on the dorsal aspect. 
Internal sac large, bearing a strong, curved flagellum on which the 
ejaculatory duct opens. This form comes near to Orina, 
Phytodecta 5-punctata. 
Median lobe tubular and slightly curved ; the lateral edges of 
the median orifice produced into two flattened, curved spines which 
curve over the orifice; median foramen occupying the ventral basal 
