218 E. M. NELSON ON THE AMICIAN TEST. 



the smaller delicate forms, while the proportion of these on the 

 whole slide is certainly much lower. 



Length 132-5 55 100 91 43'5 47-5 91-5 105 93 95 microns 

 Diameter 225 11-5 19 17 10 10 18-5 17-5 19 17 



Length 117-5 101 85 87-5 47 101 109 87 125 95-5 

 Diameter 20 18-5 17 17-5 10-5 18 17 16-5 20-5 18 



Measurements of five typical valves of varying sizes. 



[The mean of Mr. Keeley's measurements of five typical valves 

 reduced to inches. 



Length. Breadth. Transverse striae in -001 in. 



0032 -00064 77,800 



Length -0032 _ 

 *^^ Breadth- ^00064 ~^"^ 



78 

 therefore = 15-6 = English Naineida rhomboides. 

 5 



E. M. N.] 



Journ'. Quekett Microscopical Club, Ser, 2, Vol. XL, No. 68, April 1911. 



