EXPLANATION OF PLATE X.XXI. 



Fif^. 1. Pei-iophthahmis J:oelreuteri, Pallas, var. ar(ienfili)ieatu'<, Ciivier 

 and Valenciennes. A specimen 90 mm. long, from Sundaj' 

 Island, King Sound, North-western Australia. 



,, 2. PerioplitliaJmodon Inirharvs, Linne. A specimen 197 mm. long, 

 from Cooktown, Queensland. 



,, 3. Leme purjnu'ascens, De Vis. Anterior portion of a specimen 

 92 mm. long, from an unknown locality. 



,, 4. Leme morda^, De Vis. Outline of a specimen 218 mm. long, 

 from Ripple Creek, Herbert River, Queensland. 



