. 455-456.] 



HEAD OF BLATTA. 



787 



'90 ; Hyalotoma, Graber, '90 ; Chalicodoma, Carriere, '90. Biirger, 

 '97)'. Kowalevsky, Patten, Carriere, and others maintain that 

 not only does this structure arise from paued rudiments, l)ut 

 that it represents a fused pair of appendages. Bur-er m his 

 edition of Carriere's notes, does not commit hunself to the lattei 



''""on the other hand a greater number of species have been 

 noted in which the procephalon is, from the fir 

 Among these are included a number of Apterygota 

 : 00, pp. 9S-96), while of the Pterygota may be mer 

 (Huxle>, 58), Apis((irassi, '84), CEcanthus ( \\^ 

 ficula {He>mons, '95) - Mantis (\ lallancs 91) l^'' 

 kousk), 90) ctal Ikxmonshascmphw/ulth. 

 place of origin of the labrum, hctwicii tht two 

 nervous system rather than laterad ot ihcm, tundam 

 guishes this structure Irom tl 



unpaired. 



- 1-olsom, 

 u-(l Aphis 

 ^4): I'or- 



l tliat the 



. this p< 



quite clearly in two distinct hal\t>. A st 

 of other j)reparations of the >anu. ^ta_,^. t 

 though m some there was to b. mui a sli, 

 As the embryo first mentK tn^d \\a^ ot.i' 

 inchned to legaid the api>c u ukl ot the 

 mal, andtoagicc with Cholodkouskx tin 

 in Blatta its rudiment is unpaiicd. 



Bn the end of the tenth dax the cmbn 

 his nuKascd c(msidLiabh m length, an 

 the mouth ivu-t appendages aie all distinc 



the 



> duplK 

 sil cons 



