THE BRITISH FRESH-WATER PLANARIANS. 
*9 
(8.) Duges, Ant. (1828), Recherches sur l’organisation et les moeurs ties 
Planariees. Annales des. Sci. Naturelles, ser. tom. xv., pp. 139-182. 
{9.) Ehrenberg. Cttr. G. (1831), in Hemprich and Ehrenberg’s Symbolae 
physicae Animalia evertebrata exclusis insectis rencensuit Dr. C. G. 
Ehrenberg. Series prima cum tabularum, decade prima, Berolini. 
■(io.) Fabricius, O. (1820), Fortsaetlelsae af Nye Zoologiske, Bidrag VI. 
Nogle lidet bekjendte og til deels nye Fladrome (Planariae). Kong. 
Danske vid Selsk Naturvid og Mathem. Abhandlingar II. Deel.,I\)oben- 
havn, 1826. 
1(11.) Faraday, M. (1832), On the Planariae, Medical Gazette and in 
Edinburgh New Philosophical Journal, XI., 1833, pp. 183-189. 
{12.) Gamble, F. W. (1901), Flatworms and Mesozoa in Cambridge Natural 
History, vol ii. 
•{13.) Gamble, F. W., Article “ Planarians " in Encyclopaedia Britannica 
(New Volumes). 
(14.) Graff, L. von, Article " Planarians.” Encyc. Brit., 9th edition. 
(15.) Hofsten, Nils von, Arkiv. Zool., iv. (1908), No. 7, pp. 1-11. 
(16.) Houghton, W. (1868), Our Fresh-water Planariae. Intellectual 
Observer, xii.. pp. 445-449. 
'(17.) Ij ima, J. (1884), Untersuchungen iiber den Bau u. die Entwick- 
lungsgeschichte der Siisswasserdendrocoelen (Tricladen'l Zeitschr. 
fur. wissensch. Zoologie, Bd. xl., pp. 359-464, tab. xx.-xxiii., u 3. 
Text fig. 
{18.) Janichen, E. (1897), Zeitschr fur. wissensch. Zoologie, Ixii. (Structure 
of eyes of planarians.) 
(19.) Johnson, J. R. (1822), Observations on the genus Planaria. Phil. 
Trans., pt. ii., pp. 437-447. 
(20.) Johnson, J. R. (1825), Further observations on Planaria. Phil. 
Trans., pt. ii., pp. 247-256. 
{21.) Johnston, G. (1865), A Catalogue of the British Non-parasitical 
Worms in the British Museum. 
(22.) Kirby, W. (1794), Description of three new species of Hirudo with 
an additional note by G. Shaw. Trans. Linn. Soc., ii., pp. 316-320. 
{23.) Lankester, E. Ray. (1867), On the Planariae of our Ponds and 
Streams. Pop. Sci. Review, vi., pp. 388-400. 
{24.) Lang, A. (1878), Uber Conservation der Planarien. Zool. Anzeiger, 
vol. i., pp. 14-16. 
(25.) Matthiesen, E. (1904), Ein Beitrag zur Embryologie der Siiss- 
wasserdendrocoelen. Zeitschr. fur wissensch. Zoologie, Bd. lxxvii., 
pp. 274-361, tab. x-xiii., text fig. 1-3. 
{26.) Muller, O. F. (1773), Vermium terrestrium et fluviatilium, seu ani- 
malium infusorium, helminthicorum et testaceorum, non marinorum 
succincta historia, vol. i., pars. 2, pp. 52-72. 
(27.) Oersted, A. S. (1844), Entwurf einer systematischen Einteilung und 
speziellen Beschreibung der Plattwiirmer cmf mikroskopischen Unter¬ 
suchungen gegriindet. 
(28.) Pallas, P. S. (1774), Spicilegia Zoologica, Berlin,^Fasc. x. (Regenera¬ 
tion experiments). 
<29.) Parker, G. H., and Burnett, F. L. (1900), The reactions of Planar¬ 
ians with and without eyes to light. Amer.Journ. of Physiol.. 
vol. iv., pp. 373-3 8 5- 
