J 7 4 
The axial apophysis (,/ in all the figs.) is a somewhat pear 
shaped median structure, the tip of which lies completely free between 
the two inner walls (fig. 22) ; its middle portion is, as we have just said 
fused on either side to the inner wall. Posteriorly again it expands 
into a bilobed bulbous base which instead of being free is surrounded 
>y soft tissues, it is, in fact, suspended by fibrous tissue to the under 
sur ace of the dorsal gutter (figs. 23-25). It often shews evidence of 
its bilateral origin in the existence of a median cleft (fig. 24) potential 
or actual v s ^ 
f t! HE ^? RK ^ 111 aI1 t,le When we have reached the free end 
th f L- Xm apop hy si - s t,iere now appears on either side of it the tipsof 
i a Ut transverse section and attached to the tips, we see also 
p! ° nS ^ 111 aI1 the fi S s 0 which pull on these tips (fig. 22). As we 
one -1 H ISd ' We l,ieSe c hhinous arms of the fork approaching 
(alLr r Ventra,ly (% 25) ’ fina % firing, as shewn in fig. 26 
sclerites (fig ® V ® I ' S,on )- • ^ baSC ° f tWs f ° rk rCStS ° n tW0 ventra! 
only internal ,'u r m transverse section still nearer the base the 
and the vent 1 I ?°^ S structures are those forming the dorsal canal 
fromtL™ To Th" In thiS SeCtion ^ see stretch,. 
laterally we see ‘th* * ie ventraI sclerites powerful muscles (r 1 ), and 
the incurving an d thin" 1 ™ ^ ^ aCr ° SS ’ We ma 7 note here - 3,501 
this point. The vei C aracter the chitin of the lateral wall at 
replaced by various o'! SC ^ e ” tes now decrease in size, the muscles are 
practically assumed th ^4 ^ IOUps ° f musc les and the dorsal canal has 
course. ‘ C S lape !t ,la s for a great part of the rest of its 
dorsally (fig 28, a). \y epip,lai T nx has appeared, closing in the canal 
hi detail. ni<1 7 now consider some of these parts more 
Th e Epidermis f 0 
2 > 4 . 5 ) presents a fin!]". 1 '"^ th<? exter nal walls of the labella (figs, 
squamae, which struct,! rCtl ^ ul f ted surface due to small’ polygonal 
m tegument during the ~ . ltS ° f considerable folding of the 
,he labella are dosed ° f the Iabella (% s - 10-14). When 
orsally (fi g 4); the * ° eep oblique, bilateral folds are seen 
errninatmg at or near the tin commencing near the apex and 
behind the lateral group IfT ^ ** 1 the second M commencing 
P ° f hairs infra). Ventrall y there are no 
