by the scobinate gnathos, and the apex of the valva not 

 sharply geniculate. 



Valvula simple; costa almost straight. Furca curved. 

 Uncus tapered, pads raised hairy. Gnathos pointed, 

 scobinate. rEdoeagus spoon shaped thumb at orifice. 

 Cornuti many, long. Saccus rounded, centre indent. 

 Coremata on ninth segment. 



Ostium slightly produced. Signum small, irregular, 

 spined. 



Bilunaria, Hb. 154 



Valvula simple; costa geniculate before apex. Furca short, 

 two curved arms, variable in thickness in the two broods. 

 Uncus short. Gnathos stout, ctenoid, three or four teeth. 

 ^Edoaagus short. Cornuti long, fine, numerous. Saccus 

 broad, squared, indent at centre. 



Ostium weak. Signum discoid, dentate, rugose. 



Lunaria, Schiff. 71 



Valvula simple; costa short. Furca fused at base, long, 

 pointed, diverging. Transtilla separate, rounded with 

 point. Uncus broad, spatulate. Gnathos short, hooked, 

 with teeth. ^Edoeagus broad, long, cylindrical, with thumb 

 at orifice. Cornuti fine, short, about twelve. Saccus 

 broad, bilobed. Coremata large, on ninth segment. 



Bursa long, ovate, cylindrical. Signum small, discoid, 

 dentate. 



Lithina petraria, Hb. 42 



Valvula simple; costa gibbose. Furca fused at base, not 

 long, scobinate. Uncus large, curved. Gnathos long, tip 

 ctenoid. ^Edceagus stout with thumb. Cornuti strong, 

 numerous, about twenty-four. Saccus rounded. 



Ostium not strong. Signum ovate, obtusely serrated 

 and scobinate. 



Pachycnemia hippocastanaria, St. 4 2 



This species appears related to this group. 



