102 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 97 



BiW^'----::^0 Per 



-Ant 



1^'M^yM-:0^.^ — iL 



Are ^ ^ .._^ 



CIp Ant Md MxPmx 

 Lm.^ ,,.;^^^-'^^^v.^,,..Arc 

 ^,-KC^'" <"rT7:-^- Ant 



;,.•- F 



Fig. 44. — Embryonic segmentation of the head of Diplopoda as interpreted 

 by different investigators. 



A, germ band of Platyrrliacus anumros Attems before invagination (from 

 Pflugfelder, 1932 a). B, longitudinal section of head of embryo of Platyrrhacus 

 amauros shortly before hatching (adapted from Pflugfelder, 1932 a). C, young 

 embryo of Glomcris (from Heymons, 1897). D, longitudinal section of germ 

 band of Platyrrhacus amanros just before invagination, showing preoral coelomic 

 sac of clypeal region and sacs of four postoral somites (from Pflugfelder, 

 1932 a). E, embryo of Archispirostrcptus sp., about four days before hatching 

 (from Robinson, 1907). F, same, one day before hatching (from Robinson, 

 1907). 



Ant, antenna; AntGng, antennal ganglion; AntNz', antennal nerve; Arc, 

 archicerebrum ; CIp, clypeus (labrum) ; Dcr, deutocerebrum ; Gch, gnathochi- 

 larium ; iL, first leg ; Md, mandible ; MdGng, mandibular ganglion ; Mx, 

 maxilla ; iMx, sMx, first and second maxillae ; Per, protocerebrum ; Pmx, 

 postmaxillary appendage, or somite ; Pre, procephalic lobe ; TcrGng, tritocere- 

 bral ganglion; VNC, ventral nerve cord. 



