320 ox AX OLIGOCH.ETE WORM. 



(16) Yaxha, J., and Stoklasa, J. — " Die Ruben -Nematoden mit 

 Anhang iiber die Enchytrseiden," 1896. 



(16) Vejdovskv, F. — "Monographie der Enchytrasiden," 1879. 



(17) Stephensox, J. --" Studies on the Oligochseta of the Punjab," 



1909. 



(18) Hewitt, C. G.— " On an Encliytrseid Worm injurious to the 



Seedlings of the Larch." Journ. Econ. Biol. vol. iii„ 

 1908. 



EXPLANATION OF THE PLATES. 

 Plate XLVI. 



Fig. 1. Brain of Enchi/trceus albidus Henle. 



2. Brain of ISnchytrceus pellucidus Friend. cf., central fibrous portion ; 



o.ceZ?., outer cellular portion ; conn., oesophageal nerve-connective.s ; bl.sp., 

 black spots on brain. 



3. Spermatheca of Enchi/trceus alhidiis, dissected from the worm, ext.op., 



external opening ; ros.gl., rosette of glands ; amp., ampulla. 



4. Longitudinal sagittal section of E.pellucidtis through the first four segments. 



pli.h., pharyngeal bulb or ingrowth ; hr., brain ; sal.gl., salivary- gland 

 opening into pharynx; m., muscles attached to pharynx ; gept. gl., %&pts.\ 

 glands; sp., spermatheca; ces.conn., oesophageal nerve-connective; mth., 

 mouth. 



5. Longitudinal section of the gut, to show ciliates in the gut and structure 



of gut-wall, cil., ciliates in gut ; vac, vacuoles between the cells, some- 

 times containing a colourless mass. 



fi. Mesnilella fastigiata, found in the gut of IS. pellucidus. mac.n., macro- 

 nucleus; s^)., spicule ; mc, vacuole ; sw., characteristic swelling at one 

 end. 



7. Ciliate with five buds, found in the gut. mac.n., macronucleus ; vac, 

 vacuoles. 



Plate XLVIL 



Fig. 8. Two views (a) and (h) of another ciliate from the gut. 



9. Two views (a) and (b) of a fourth ciliate from the gut. mac.n., macro- 

 nucleus ; vac, vacuoles arranged in two longitudinal rows. 



10. Transverse section to show the small blood-vessels connecting dorsal and 



ventral vessels with the blood-sinus surrounding the gut. d.v., dorsal 

 vessel ; v.v., ventral vessel ; chl. cells, chloragogen-cells surrounding the 

 gut ; nepJi., nephridium ; c.n.c, ventral nerve-cord. 



11. (a) Diagram of segments 8-12, to show peculiar bodies in the nerve-cord. 



(6) Nerve-cord, with one of these bodies embedded in it (much higher 

 power), v.n.c, ventral nerve-cord ; gr.hod., granular bodies in the nerve- 

 cord. 



12. Longitudinal section through nerve-cord and ventral body-wall, ep., epi- 



dermis ; c.»i., circular muscles; l.m., longitudinal muscles; n.h., nerve- 

 branch; v.n.c, ventral nerve-cord; «., nuclei. 



13. (a) Nephridium. [h) Nephridial funnel, n.f., nephridial funnel ; ext.c, 



external cilia; n.c, nephridial canal; h.c, bunch of cilia; ext.dt(,ct., duct 

 to the exterior; sept., septum; «/>./., upper lip; L 7,., lower lip; int.cil., 

 internal bunch of cilia; ext.cil., external independent cilia. 



Plate XLVIIL 



Fig. 14. Semi-diagrammatic drawing of the septal glands, obtained by leconstruction 

 from sections, ph., pharynx; snl.gl., salivary glands; lob. of sep.gl., 

 lobe of the septal gland in segment 5 ; sol.st., solid strands connecting 

 septal glands with pharynx. 

 15. (a) Longitudinal sagittal section through segments 4-6, showing septal 

 glands : sp., spermatheca ; pJi.m., pharyngeal muscles ; d.v., dorsal 

 vessel ; sept.gl., septal gland in segment 6 ; s.c, solid cord connecting the 

 three septal glands ; sal.gl., salivary glands, (b) More magnified view of 

 part of the previous section : bl., solid blocks of tissue ; s.c, solid cord 

 connecting the three septal glands. 



