Plate 8. 



Fig. 99. Newly hatched larva of Tabauus aiitumnalis (?). 5 1 to 5 13, somites 

 (segments) of the body; w, prolegs armed with hooks; tb, touch-tactile bristle; 

 ph, pharynx; md, midgut; ed, hindgut; wa, Malpighian vessels;^, anus; tr, tracheal 

 trunks; / sp, terminal spine; g sup, upper, ^g ////, lower cephalic ganglion; bg\ to 

 bg \\, ventral chain of ganglia; ch 1 to ch i, chordotonal organs; ot, otocyst-Kke 

 organs on posterior border of anal segment (Graber's organ). After Graber. 



Fig. 100. a. Right side of 2nd and 3rd body segments of young Tabauus larva 

 highly magnified. 



2nd segment: cu, cuticle; ma, matrix; m 1, circular muscles of pharynx; 

 in 2, muscles originating on the posterior border of the first segment, and ex- 

 tending forward and inwards, possessing strongly marked transverse striation 

 and great contractility; hn, nerve of the skin; ekg, mkg, ganglion cells connected 

 with this nerve and possessing one nucleus ekg, or several mkg; tb, tactile 

 bristle; s 2 c/i 1 monoscolopic, s 2 ch 2 triscolopic chordotonal organ; //, liga- 

 ment; st 2, rods; cfs, terminal filament; e I, e 2, c 3, attachments of filaments; 

 mn, nerve going to muscle; /r, branch of tracheal system; hg, ganglion; nu, 

 nuclei. 



3rd segment, ;;/ 3, system of sagittal muscles, freely anastomizing, and in 

 fresh condition smooth (unstriated) in appearance; bl, region of integument cov- 

 ered with bristles, in anterior part of segment; s 3 ch 1 to s 3 ch 6 chordotonal 

 organs (taken from different individuals); {ch 1 and ch 2, and again ch 4, 5, and 

 6 were observed in the same individual) ; e i, e 5, e 6, points of attachments of the 

 terminal filaments of 5 3 ch 5; e 7, e S, c 9, those of .? 3 ch 2; g Inf, lower pharyn- 

 geal ganglion. After Graber. Zeiss oil immersion lens. 



Fig. 100. b. Tactile bristle of young larva of Tabajius aulumnalis (?), with 

 its ganglion, cu, cuticle; tb, tactile bristle, articulating on its place of attach- 

 ment; ma, matrix (hypoderm), in fresh condition showing no cell limits, with 

 reddish nuclei; starting from it a fine filament torn out of the sheath surround- 

 ing the bristle; k, nuclei; n, nerve; g, ganglion. After Graber. Zeiss oil 

 immersion lens. 



Fig. 101. Triscolop chordotonal organ of the 2nd segment of the same 

 larva. », nerve; g 'i^, g 2, g 3, the three ganglion cells, lying one above the other, 

 with reddish nuclei; xfs, neurit; st, rods; ko, heads of rods; mk, nucleus of the 

 proximal end; dk, of the distal end of the rod\ fs 1 to fs 3, the three terminal 

 filaments. After Graber. Zeiss oil immersion. 



Fig. 102. Monoscolop chordotonal organ of the 2nd segment of the same larva 

 xfs, neurit visible in the interior of the rod. After Graber. Zeiss oil immersion. 



