Notes on Myriapoda. 7 



closely parallel to the alimentary canal and might, on 

 lighting, look as though the luminosity came from the gut. 

 He suggests tliat if the luminosity occurs within the glands 

 or their reservoirs, without excretion, then the fairly thin 

 chitinous exoskeleton would let the light shine through it. 

 VerhoefE accompanies his description of this phenomenon 

 with two text-figures of the sternal glands which occur in 

 most Gcophilomorph^ (fis^- ^ ^'^^ 5), and refers the reader 



Fiof. 5. 



Chcetechelyne vesuviana. 



Fig. 4. — Stomal irland-oroiip as iiii-ured by Veikoeff, (12) p. 312, after 



Diiboscq. (I, the disk w'lirli opens on to the pore-tield ; a, anterior ; 



p, posterior elements ; /, ouspensory attaclimeut. J. W. Smith & 



8. G. B.-B. pbot.-del. 

 Fig. ;j. — An isolated cell from the gland-group, x 000, as figured by 



Verlioeff, (12) p. 312, after Diiboscq. ny, nucleus of the cell; 



r, cell-network ; na, nucleus of the irland-alveolus ; fm, muscle-fibre. 



J. W. Smith & S. G. B.-B. phot.-del. 



to his plate v. figs, G, 7, & 9 (this last is our fig. 3), while 

 in a footnote, adding a remark that the cause of luminosity 

 is unknown, he mentions bacteria again as a possible cause, 

 and uls(j ([uotes Gadeau de Kerville's opinion that an ex- 

 clusively chemico-physical incidence may i)c a more or less 

 sufficient explanation, lie also points out that it is not at 

 all clear why one species illuminates and others nearly 

 related do not. 



We must next direct attention to a paper by Gazagnnire 

 (10), witii which Verlioeff does not appear to have been* 



