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AceriS. From S. J. Capper. 



Harpes broad ; clasper with long hook ; uncus is very 

 large and cygnated, with long neck ; vesica with long 

 band of strong cornuti. 



Mypiese. From J. W. Tutt. 



Harpe rounded ; clasper reaches nearly to the apex of 

 the harpe and is bifurcate; uncus short and blunt; vesica 

 has a short band of strong cornuti. 



From Dr. Chapman. 



Harpe rounded ; clasper bifurcate, the outer hook pro- 

 longed and ending in a sharp point ; uncus is slender and 

 simple ; vesica has a thick bunch of long cornuti. 



AllPieoma. From John E. Robson. 

 Harpe rounded ; clasper bifurcate, the inner hook long ; 

 uncus cygnated ; vesica with several short cornuti. 



Menyanthidis. From S. J. Capper. 



Harpe rounded; clasper bifurcate, the arms being of 

 equal length, the inner one terminating in a pointed 

 hook ; uncus is tongue shaped ; vesica has a bunch of 

 strong bulbed cornuti. 



Alni. From Dr. Chapman. 



Harpe rounded ; clasper bifurcate with an indication 

 of further division of the outer arm ; the inner arm is 

 very long and curved ; below the base is a well marked 

 editum ; uncus is simple ; vesica has a number of small 

 bulbed cornuti. 



Tridens. From Dr. Chapman. 



Harpe rounded ; clasper trifurcate ; uncus long and 

 simple ; vesica has a large bunch of short stout cornuti 

 hardly bulbed ; the juxta is broad and strongly scobinated. 



Psi. Pencils absent. 



Harpe rounded ; clasper bifurcate the outer arm being 

 rudimentary and rounded; uncus simple; vesica with a 

 large bunch of strong stout teeth ; juxta large, the 

 scobination being only on the upper portion. 



