THE PHYLOGENY OF THE TRACHEH] IN AEANEiE. 563 
Fig. 5. — (Zeiss, C, IV, warm Flemming's solution + alcohol.) Har- 
l^actes Hombergi, ad. $ . Sagittal section through a lung-book. 
Fig. 6. — (Zeiss, A, IV, spirits.) Caponia spiralifera, ad. $ . 
Transverse section thi-ough the basal part of the trachea of the second 
resiiiratory segment. 
Fig. 7. — (Zeiss, C, IV, spirits.) Lateral part of fig. 6. 
Fig. 8. — (Zeiss, C, IV, spirits.) Caponia spiralifera, ad. ?. 
Sagittal section through the entapophysis of the first and the lateral 
tracheal pocket of the second respiratory segments. 
Fig. 9. — (Caustic potash.) Caponia spiralifera, ad. showing 
tracheal system (the ends of the tubules of the ti'acheaj of the second 
resiiiratory segment are not drawn in). 
Fig. 10. — (Zeiss, A, IV, caustic potash.) Caponia spiralifera, 
ad. $ . Right anterior trachea from the medial side. 
Figs. 11 and 12 (Zeiss, C, IV, spirits.) Same series as fig. 8. Sagittal 
sections through the left and right anterior trachea? respectively. In 
fig. 12 the cuticula of the posterior side and the hypodermis of both 
sides of tlie pedicel have not been di-awn in. 
VOL. 45, PART 4. — NEW SERIES. 
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