386 WHEELER. 
DESCRIPTION OF PLATE XXI. 
Doryphora decemlineata. 
Fic. 92. Sagittal section through stomodzum (sf) of an embryo in the same stage 
as Fig. 72. ecd, ent, msd, germ layers; /0, labrum. 
Fic. 93. Cross-section of median dorsal portion of an embryo, just after the union 
of the ectoderm (ecd) from either side of the body; cé, cardioblasts; ad, fat cells; 
am, one of the last amnion cells passing into the yolk through the opening between 
the two lateral halves of the mesenteron. zs/, muscular tissue; e7/¢, entoderm; s/m, 
splanchnic mesoderm. 
Fics. 94 to 104. Sections 1, 3 to 8, 10, 11, 13, and 14, through the mesothoracic 
ganglion of an embryo somewhat younger than that of Fig. 74. cw, longitudinal 
commissure; ccm, cross-commissures; #s, Punktsubstanz; mzs¢, Mittelstrang; ecd and 
e, hypodermis; g4/, ganglioblasts. 
Fic. 105. Section through fore part of metathoracic ganglion. The Mittelstrang, 
ist, persists as the fzca (subsequently chitinous). g/, ganglion; fs, Punktsubstanz; 
visi, muscular tissue attached to the furca; ecd, hypodermis. 
