hearing on the origin of Insects. 

 Fin. 5. 



163 



Fig. 5. Lej/isma, sp. The appendages of the ninth abdominal somite in 

 the male : p, the coalesced basal joints (protopodite) of one side 

 carrying two branches, a, the exopodite, and b, the unmodified 

 endopodites, which, with its fellow, answers to the posterior ele- 

 ments of the ovipositor in the female, but which is lost in the 

 same segment in male Blattida in the coalescence of the two 

 protopodites with one another and with the sternum (fig. 4) ; 

 these endopodites are unquestionably represented in the pre- 

 ceding somite by a pair of whisps of long seta^, which whisps 

 homologize with the more mesial of the two pairs of fringes 

 of stiff yellow seta; in the somites anterior to the eighth, from 

 which we may confidently infer that the ancestors of Lepisma 

 possessed two-branched appendages, like those of the ninth, to 

 all the somites of their alnlomen. 



The sternum and the basal parts of the protopodites are not 

 shown in the figure. 



