264 Prof. M'liitosli's Notes from the. 



Fig. 14. Section in front of the tail in a ripe male. The gut is still 

 enveloped in the spacious sinus, vs., with its dorsal and ventral 

 mesenteries, and the coelomic cavity is loaded with sperms. 

 The gonads, g., are large, as also is their blood-supply, hi\, 

 whilst the nerve-coi'd is smaller than in front. The arrange- 

 ment of the muscles of the body-wall diverges from that in 

 front, since the dorsal longitudinal muscles, ilm., are thick- 

 ened on each side of the middle line, as are also the ventral 

 above the nerve-cord ; but in the figure the parts have been 

 separated by the methods of technique. The hooks, u., occur 

 in numbers along the whole lateral region on each side, the 

 bristle-tufts being shifted to the dorsal aspect. X oc. 2, 

 obj. A. 



Fig. 15. Section through the characteristic arrangement of the caudal 

 septa, spt., some distance behind fig. 14. The gonads, g., in 

 this region increase in size from before backward, and the 

 free sperms lie in the ciiamber above the upper septa. A 

 transverse septum is seen below the fjouads. The dorsal 

 longitudinal muscles are thickest, whilst the ventral cover 

 two-thirds of the body-wall. X oc. 2, obj. A. 



Fig. 20. Peculiar peniiate arrangement of the gelatinous tissue and 

 glands of the hypoderni anteriorly. X oc. 4, obj. D, with 

 full draw-tube. 



Fig. 31. Transverse section of the posterior region in a female with well- 

 developed ova, ov., wiiich arise from the vascular ovigorous 

 tissue veritrally, as in the male ; some are cut and others 

 altered by compression. X 100 diam. 



Plate X. 



Fig. 19. Longitudinal section showing the arrangement of the mucus in 

 the mucous glands. X oc. 2, obj. 4. 



Fig. 30. Section through the stomach after the blood-sinus, vs., around 

 it is establisiiHd. w/;., mucous gland; iu., blood-vessels. The 

 median ventral furrow, making the organ bifid in section, has 

 now disappeared. X lOO diam. 



Fig. 32. Tip of the tail of Myriochcle protruding from a tube. Two 

 dorsal papillas and a slightly more prominent ventral papilla 

 occur posteriori}'. The zig-zag condition of the gut in this 

 region is indicated. X 60 diam. 



Fig. 33. Section of the tip of the tail of Mgriachele, showing the valvular 

 apparatus, val.p., at the constriction of the body-wnll, the 

 septa, spt. The blood has been rendered opaque blackish 

 by the hfematoxylin used in the technique, and apparently 

 has accumulated at the septa. 



Fig. 34. Transverse section of the extreme tip of the tail of a female with 

 the modified areolae of the hj'poderm, a larger area on each 

 side being evident, x oc. 2, obj. D, with 1 inch of draw- 

 tube. 



Fig. 35. Section of the tail a little in front of the foregoing, showing the 

 large areolee of the hj'poderm and the blood in the sinus, vs, 

 around the gut. x oc. 2, obj. D, with 2-inch draw-tube. 



