28 Dr. & the Rev. S. Graham Brade-Birks— 
for his valuable advice about some of the physico-chemical 
considerations involved. Mr. J. W. Smith of Darwen has 
again given us the benefit of his great photographie skill in 
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 
kind enough to prepare some microtome sections for us, 
as we do not possess facilities for this work in our own 
laboratory. The careful observations made by that keen 
band of workers, the Dartford Naturalists’ Field Club 
[especially by those members whose names are mentioned in 
our thirteenth paper (2), and by Mr. A. Cumberland 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 best thanks, 
III. Rererences. 
[In addition to the works cited in the present study, there 
are a number of relevant references in Gazagnaire’s paper 
(10) and Phipson’s book (11) mentioned below, and in our 
own thirteenth paper (2).] 
(1) Brave, Hmpa K., anp 8. Grauam Brape-Birxs, “Notes on 
Myriapoda.—VI. Report on Chilopoda and Diplopoda, 1916-17.” 
Lancs & Ches. Nat. vol. x., July 1917, pp. 118 et segg. 
(2) Brapr-Bmxs, Hinpa K. and 8S, Granam. “ Notes on Myriapoda. 
—XIII. Some Kent Records, with Special Reference to Luminous 
Forms and with Lancashire and Cheshire Comparisons.” Lancs. 
& Ches. Nat. vol. xi Sept. 1918, pp. 152-165, Oct. 1918, 
pp. 186-192. [With Appendix by 8. Priest. | 
(3) Brévemann, Henry W. “A propos d’un systéme des Geophilo- 
morphes.” Arch. de Zool. expér. et gén. 5° sér. t. ill, pp. 803-340, 
pl. viii, LO Dec. 1909. 
(4) Dauteren, Utric. “The Production of Light by Animals.” 
Reprinted in three parts, each paged separately. | 
(4a) From Jour. Franklin Institute, Nov. & Dec. 1915, 
Jan. 1916. 
(48) Ibid., Feb., Mar., and Apr. 1916. 
(4c) Ibid, May and June 1916 and Jan. 1917. 
(5) Dusois, Rapuant. “ Les myriapodes lumineux, Soc. de Biol. 
(France),” report in Rey. Scient, ii. sér, t. xili. (2. e., t, xxxix.) 
1887, p. 509. 
(6) . ‘La mer phosphorescente et les animaux lumineux.” Soc. 
de Biol. (France) report, zbed. pp. 603-4. 
(7) Acad. des Se. de Paris, 23-81 May, 1887, report, cbed. p. 731. 
(8) ——. “Sur le mécanisme de la production de la lumiére. chez 
YOrya barbarica d’ Algérie.” C. R. de Acad. des Sci. t, exvii. 
1893, pp. 183-6. 
(9) Foret, Aueustz. ‘The Senses of Insects’ (trans. 1908: Macleod 
Yearsley, London). 
