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1875. Perkier, E. Sur le Tubifex umbellifer. Arch. Zool. Exp., IV, 

 Notes pp. VI- VIII. 



1903. Pierantoni, Umberto. L'Ovidutto e la emissione delle uova 

 nei Tubificidi (Contribute- alta biologia degli Oligochaete marini). Arch. 

 Zool. Napoli, Vol. 1, pp. 108-119. 



1893. Randolph, H. Ein Beitrag zur Kenntniss der Tubificiden. 

 Vierteljahrschr. Nat. Ges. Zurich, XXXVII, pp. 145-147. 



1869. Ratzel, F. Beitrage zur anat. und systematisch Kenntniss der 

 Oligochaeten. Zeitschrift f. wiss. Zoologie, Bd. XVIII, pp. 563-591, PI. 42. 



1867. Beitrage zur anat. von Enchytraeus vermicularis. 



Zeit. f. wiss. Zool., Bd. XVIII, pp. 105-109, Taf. 6, 7. 



1902. Rice, Wm. J. Studies in Earthworm chloragogues. Biol. Bull. 

 Woods Holl, III, pp. 88-94. 



1878. Rolleston, G. The blood corpuscles of the Annelids. Journ. 

 of Anat. and Physiol., Vol. XII, PI. Ill, pp. 401-418. 



1764. Schoeffer, J. Abhandlungen von Insecten Regenberg. 



1906. Southern, R. Notes on the genus Enchytraeus with description 

 of new species. Irish Naturalist, Vol. 15, pp. 179-185. 



1909. Contributions towards a Monograph of the British and 



Irish Oligochaeta. Proc. Roy. Irish Acad., Vol. XXVII, p. 119. 



1913. Stephenson, J. On Intestinal Respiration in Annelids, with 

 considerations on the origin and evolution of the Vascular System in that 

 Group. Trans. Roy. Soc, Edin., Vol. XLIX, Part III (No. 14). 



1909. Report on a Collection of the smaller Oligochaeta made 



by Capt. F. H. Stewart, I.M.S., in Tibet. Rec. Ind. Mus., Calcutta, III, 

 pp. 105-114. 



1910. On some littoral Oligochaeta of the Clyde. Trans. Roy. 



Soc. Ed., Vol. XLVII, Pt. 1 (No. 2). 



1910a. Studies on the aquatic Oligochaeta of the Punjab. 



Rec. Indian Mus., Vol. V, Part I. 



1912. On a collection of Oligochaeta mainly from Ceylon. 



Spolia Zeylanica, Vol. VIII, Pt. XXXII, p. 251. 



1888. Stolc, A. Monographie Ceskych Tubincidii Morfologicka a 

 systematicka studie. Abk. Bohm. Ges., Series VII, Vol. 2, No. 11, 45 pp. 



1907. Szuto, Andor. Adatok az edesvfzi cspvag6 fereg. (Tubifex 

 tubifex). Mull kivalaszt6 szerveinck ismeretehez. Allatt Kozlem. Kot. 6, 

 pp. 31-36. 



1884. Vejdovsky, F. System u. Morphologie der Oligochaeten. Prag., 

 166 pp., 16 plates. 



1891. Note sur une Tubifex d'Algerie. Mem. Soc. Zool. 



Fr., IV, pp. 596-603, PI. XV. 



1907. Watson, A. T. The habits of tube-building worms. Brit. Assoc. 

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1906. Wagner, F. Zur Oecologie des Tubifex und Lumbriculus. 

 Zool. Jahrb. Abt. Syst., Bd. 23, p. 295. 



1852. Williams, T. Blood proper and chylaqueous Fluid of Inverte- 

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1904. Wilson, E. The cell in Development and Inheritance. 



