264 Prof. M'liitoali'.s 2\^otes from the 



Fig. 11. Section in front of the tail in a ripe male. The put is still 

 enveloped in the spacioussinus, vs., with its dorsal and ventral 

 mesenteries, and tlie coelomic cavity is loaded with sperms. 

 Tlie jronads, f/., are large, as also is their hlood-snpply, hv., 

 whilst the nerve-cord is smaller than in front. The arrange- 

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

 front, since tiie dorsal longitudinal muscles, dm., are thick- 

 ened on eacli yide of the middle line, as are also the ventral 

 above the ntu've-cord ; but in the figure the parts have been 

 separated by the methods of technique. The iiooks, 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, spf., some distance behind tig. 14. The gonads, (/., in 

 this region increase in size from before backward, and the 

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

 transverse septum is seen below the gonads. The dorsal 

 longitudinal muscles are thickest, whilst the ventral cover 

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



Fi^. 20. Peculiar pennate arrangement of the gelatinous tissue and 

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

 full draw-tube. 



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

 developed ova, ov., which arise from the vascular ovigerous 

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

 altered bj- compression. X 100 diani. 



Plate X. 



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

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



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

 it is established. «?<7., mucous gland; Ay., blood-vessels. The 

 median ventral furrow, niakin;r the organ bifid in section, has 

 now disappeared. X lOU diam. 



Fiff. 32. Tip of the tail of Myrioi/iele protruding from a tube. Two 

 dorsal papillae and a slightly more prominent ventral papilla 

 occur posteriorly. 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 Myriuchele, showing the valvular 

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

 septa, spt. The blood has been rendered opaque blackish 

 b}' the haematoxylin u.'^ed in the teclinique, and apparently 

 has accumulated at the septa. 



Fig. 34. Transverse section of Llie extreme tip of the tail of a female wit.h 

 the modified areoLne 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 areolae of the hypoderm and the blood in the sinus, vs, 

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



