DEVELOPMENT OF THE ANTENN.E OF TERMITES. 251 



As an instance of the varying totals leading to miscon- 

 ception those of a certain Euternies may be brought under 

 notice. The images are stated to have XV-, XVI- and XVII- 

 jointed organs, and this conveys the impression of three quite 

 different antennee being developed in the same caste of the 

 same species. Fundamentally all three are alike, being 

 composed of the same number of elements with the number 

 of joints reduced by the suppression of one or two articulations. 



To meet such difficulties two systems of notation have been 

 adopted. One is distinguished by Roman numerals, the other 



Text-fig. 2. 



Diagrams illustrating the two methods employed for the notation 

 of joints of the termite antenna. The conventional, in Roman 

 numerals, shows A to be of XYII. b of XVI, and c of XV 

 joints. The unconventional method shows all three to have a 

 like composition. 



by ordinary numerals. The Roman numerals are employed 

 for any conventional statement or count, the ordinary numbers 

 to indicate the elemental nature of the fiagellum as from its 

 apex to its base. This method is employed in fig. 2 for the 

 three variations of the Euternies cited above, and it will be 

 seen that, notwithstanding the different counts, the elemental 

 condition is the same. 



(3) The Process op Joint-Multiplication. 

 The process of joint-multiplication is an internal meta- 

 morphosis accompanied by an external ; and, as in the case 

 VOL. 4, FART 2. 18 



