30 Notes on Myriapoda. 



KXl'LANATIOX OF THE PLATES. 



1*1. ATE I. 



Fiij. 6. " The Elcptrin Coiitipedt.'." An early Victorian idea of the appeav- 

 anco of a pliiispboreseent L'hilopoJ, beiii^' Hg. .'JZoO in Ciiarles 

 Knight's 'Pictorial Museum of AuimateJ Nature,' vol. ii. 

 (c. 1840). 



Fly. 7. Holder for microscopic examination of luminous centipedes. 



s. a. \^.-\^. del. 



Fi(j. 8. Apparatus arranged for the examination of luminous centipedes. 

 A, flexible wire from positive terminal of coil direct to the 

 distant strip of foil in the holder ; U, wires from negative \x>v- 

 Uiinal of coil to push and from push to the ne;ir strip of foil 

 in the holder; C, bull's-eye condensiT ; /*, holder in position ua 

 the st.ige of the microscope; s, supports, on the left for wire 15, 

 on the right for tiie bull's-eye condenser. J. W. Smith phot. 



Fiij. U. Microi)hotogritph of several segments of (ieujihilus C(nj)<)p/iai/iis, 

 to show the appearance of the " white glands "' before disoliiirgr! ; 

 they are seen as cloudy white masses beiieatli the sternal and 

 episternal plates. The highly illuminated parts of the chitinous 

 exoskeletin stand out as white lines and patches, the po-terior 

 limit of the sternal plate is .seen as a jiractieally straight while 

 line, its anterior edge is marked by two rather liner while lines 

 which fail to meet in the middle line. Compare with I'l. H. 

 fig. 11. J. W. Smith microphot. 



Fii/. 10. rhotogrnph of a drawing to illustrate the appearance of the 

 ventral surfaces of four tegmeuts of (iiujihilus taijui/i/iftf/tis as 

 Been in the durk when viewed under tlm nurroscojie imnie- 

 diatelv after electrical stinuilntion (see de^crillliun in the t<txt). 

 11. K.'li.-li. & S. G. li.-B. del. J. W. Smith & S. U. li.-li. 

 phot. 



Tlatk II. 



Fit/s. 11, 12. Oeopfiilus carpojihat/ns, S ,l)arwei\,co\]ecte<idth July, H'lO. 

 Drawiiiirs of the same (Y thirty-third) segment, X 40, made two 

 days aft>'r capture. Fig. 1 1 before, fig. IJ after ekctricul slimu- 

 lation and phosphorescence. In this instance three glands only 

 wore undiseliarged by the stimulus. 11. K. 15.-15. del. 



Fii/. 13. The a])pearance of luminosity us reciu'ded by photogra]ihic film. 

 This result was obtained by the luetliod described in the lexl, 

 the animal being secured on the b.ick of the lilm and lumines- 

 cence stimulated by pressure, X 3. J. W. Smith i: S. ii. iJ.-li. 

 phot. 



