Explanation of Plate XVIII. 



Each Figure is named on the Plate. 



Tarucus caUivara, p. 278, upper left-hand figure. 

 ,, venosHS, p. 275, ujiper right-liaiul figure. 

 „ alleralus, p. 280, lower left-hand figure. 

 „ fheophraslus, p. 28(5, lower right-hand figure. 



The figures on Plate XVIII of the virgae excitatae and tertorius 

 are magnified about 55 diameters. 



