28 Dr. ct the Rev. S. Graham Bradc-Biiks— 



for liis valuable advice about some of the physico-chemical 

 cousiiloraiions involved. !Mr. J. W. Smith of l);ir»cii has 

 a'^aiu ^iveu us the i^enefit of his great jjliotographic skill iu 

 the production of those illustrations in this paper which bear 

 his name. Mr. E. Ashby, of the Cryptogamic Laboratories 

 of the Botanical Department at Manchester University, was 

 kiiul enough to prepare some u)icrotome sections for us, 

 as we do not possess facilities for this work in our own 

 laboratory. The careful observations made by that keen 

 baud of workers, the Dartford Naturalists^ Field Club 

 [especially by those members whose names arc mentioned in 

 our thirteenth |)aper (2), and by Mr. A. Cuuiljcrland whose 

 name was unfortunately omitted there], have been an 

 inspiration to us ; to that band this paper really owes its 

 beginning. To all these we tender our i)est thanks. 



III. RErEKENCES. 



[In addition to the works cited in the present study, there 

 are a number of relevant references iu Gazagnaire's paper 

 (lO) and Phipson's book (11) mentioned below, and in our 

 own thirtcentii paper (2).] 



(i) BuADK, Hilda K., and S. Uhaham Huadk-IJuiks. "Notes on 

 Mvriapoda. — VI. Report on Uhilopoda and l)ii)l()pudn, l'JlO-17." 

 Lanes i^; dies. Nat. vol. x., July 1917, pp. 113 it seqt], 



(2) IJuADK-BiRKS, IIiLOA K. AND S. GiiAUAM. " Notes Oil >rvria]ioda. 



— XIII. fSomo Kent Records, witli .Special Reference to Jviiiuinoiis 

 Forms and with Lancashire and Clioshire Comparisons." Lanes. 

 & Ches. Nat. vol. xi., Sept. 1918, pp. loi^-l(j5, Oct. 1918, 

 pp. 180-192. [ANith Appendix by S. Priest.] 



(3) BiuiLKMANN, IlKNitv \N'. " .\ propos d'uu systeuic des Geopliilo- 



morphes." Arch, de Zool. exper. et gen. 5' sor. t. iii. pp. 303-340, 

 pi. viii., 10 Dec. 1909. ^ 

 (4.) Daulgukn, Ui.uic. "Tiie I'rodiiction of Light by Animals." 

 [Reprinted in three partf, each pagL'd separately.] 



(4rt) From Jour. Franklin Institute, Nov. &: Dec. 1015, 

 Jan. 1910. 



(Ab) Knil, Feb., Mar., and A).r. 1916. 



(4c) Ibid, May and June 1910 and Jan. 1917. 



(5) Duiiois, Rai'iiakl. " Les myriapodes luuiineux, Soc. de Biol. 



(France)," report iu Rev. Scieut. iii. slt. t. xiii. {i.e., t. xxxix.) 

 1887, p. 009. 



(6) . " La mer phopphorescente et les nuimaux luuiiueux."' Soc. 



de Biol. (France) report, ibid. pp. 003-4. 



(7) . Acad, des Sc. dt^ i'aris, 23 31 May, lt>87, rejjort, ibid. p. 731. 



\i) . " Sur le mecanisme de la production de la lumiere choz 



l'()n/a bitrbitrifci d'Alg(5rie." C. R. de IWcad, des Sci. t. cxvii. 

 1893, pp. lH.3-0. 

 (9) FoiiKL, AuousTK. 'The Senses of Insects' (traus. 1908: Mncleod 

 Yearsley, London). 



