564 Mr. D. Sharp and Mr. F, Muir on the Comparative 



Orina speeiosa. 



Median lobe forming a long, fairly slender tube, slightly curved ; 

 ventral edge of median orifice Ijluntly 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. Tegraen 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 

 llagellum 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 sharpi. 



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. 



Faroiisis variolosa ? (from Sydney) (PI. LXXIV figs. 210, 



210rO. 

 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 b-pimctata. 



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 



