14 MR FRANK E. BEDDARD ON THE STRUCTURE OF OLIGOCH^ETA. 



9. Stolc, A. [On Bohemian Tubificidae], Abhandl. k. bohm Akad., 1888. 



10. Perrier, E. M£moires pour servir a L'histoire des Lombriciens terrestres, Nouv. Arch. Mus., 



t. viii. (1872). 



11. Perrier, E. fitudes sur un genre nouveau des Lombriciens (gen. Plutellus), Arch. Zool. Exp., 



t. ii. (1873). 



12. Vejdovsky, F. System und Morph. d. Oligochseten, Prag, 1884. 



13. Rosa, D. Nuova Classificazione dei Terricoli, Boll. Mus. Zool., Torino, 1888. 



14. Michaelsen, W. Synopsis der Enchytrseiden, Abhandl. naturw. Vereins in Hamburg, Bd. xi. 



EXPLANATION OF PLATE. 



Fig. 1. Ventral surface, showing distribution of setae, pr, prostomium ; £ , atrial pores. 



Fig. 2. Sette. a, of posterior, b, of anterior, segments. 



Figs. 3, 4. Section through posterior and anterior region of body-wall to show relative thickness; the blood 



capillaries in fig. 4 are shown penetrating the epidermis. 

 Fig. 5. Dissection to illustrate gizzards, sp., septa ; g, gizzards. 

 Fig. 6. Transverse section of gizzard, drawn to scale. 

 Fig. 7. Longitudinal section through mouth and anterior segments, m, mouth; pr, prostomium ; I, II, III., 



1st, 2nd, 3rd segments; ce, supra-cesophageal ganglion ; s, setse. 

 Fig. 8. Section through genital segments of an individual, in which the gizzards are situated further back 



than in M. Barwelli. IX, X, XI, segments numbered ; t, testis ; v.d, vas deferens funnel ; 88, sperm 



sac : od, oviduct ; at, atrium. 

 Fig. 9. Section through male genitalia of M. Barwelli. t, testis; ss, sperm sac; sp, septum separating segments 



IX and X ; vd, vas deferens connected with funnel close to attachment of testis ; at, atrium. 

 Fig. 10. Diagrammatic longitudinal section to illustrate positions of different parts of alimentary tract, to, 



mouth ; 6, buccal cavity ; nc, nerve cord ; ph, pharynx ; ce, narrow region of oesophagus ; oe', wider 



region ; g, gizzards. The segments are numbered. 



