486 FRANK E. BEDDARD. 



in the Tracheata, they have been functionally replaced by the 

 somewhat metamorphosed equivalent of the anal nephridia. 



It must be admitted, however, that more facts are required 

 before the above remarks can be considered as anything more 

 than a suggestion. 



List of Literature referred to. 



(1) Beddard, F. E. — " On the Anatomy of a Species of Diachseta," * Q,uart. 



Journ. Micr. Sci.,' vol. xxxi, p. 159. 



(2) Beddard, F. E. — " On the Structure of a New Genus of Lumbricidse 



(Thamnodrilus Gulielmi)," ' Proc. Zool. See.,' 1SS7, p. 154. 



(3) Beddard, F. E. — " On a Living Species of Perichseta, with Remarks on 



other Species of the Genus," • Proc. Zool. Soc,' 1890, p. 52. 



(4) Beddard, F. E. — " On the Specific Characters and Structure of certain 



New Zealand Earthworms," ' Proc. Zool. Soc.,' 1SS5, p. 810. 



(5) Beddard, F. E. — " Contributions to the Anatomy of Earthworms, with 



Descriptions of some New Species," ' Quart. Journ. Micr. Sci.,' 

 vol. XXX, p. 421. 



(6) Beddard, F. E. — " On the Structure of Three New Species of Earth- 



worms, &c.," loc. cit., vol. xxix, p. 101. 



(7) Beddard, F. E. — " On the Occurrence of Numerous Nephridia," &c., 



loc. cit., vol. xxviii, p. 397. 



(8) UosA, D. — ' I Lumbricidi del Piemonte.' 



(9) E.OSA, D. — " Nuova Classificazione dei Terricoli," ' Boll. Mus. Comp. 



Zool. Torino,' vol. iii. No. 41. 



(10) BosA, D. — "I Lombrichi raccolti nell' Isola Nias," &c., 'Ann. Mus. 



civ. Genova,' vol. vii, 1889. 



(11) Benham, W. B. — " Studies on Earthworms," No. I, ' Quart. Journ. 



Micr. Sci.,' vol. xxvi, p. 213. 



(12) HoRST, R. — " Midden Sumatra Expeditie," ' Natuul. Hist, xii Afdeeling. 



Vermes.' 



(13) Perrier, E. — " Memoires pour servir a I'histoire des Lombriciens 



terrestres," ' Nouv. Arch. Mus.,' t. viii, p. 142. 



(14) Vaillant, L. — ' Histoire naturellc des Anneles marins et d'eau douce, 



t. iii, Paris, 1889. 



(15) Bourne, A. G. — "Contributions to the Anatomy of tlie Hirudinea," 



' Quart. Journ. Micr. Sci.,' vol. xxiv, p. 419. 



