532 /. PERCY MOORE. 



Fig. 4. Longitudinal section through a portion of the clitellum (dorsum of 

 sixth somite). Alum cochineal. X 195. r, <:, epidermal cells; ^,^, glands; Im, 

 longitudinal muscle fibres; cm, circular muscle fibres. 



Fig. 5. Partial reconstruction, from camera drawings of successive longitudi- 

 nal sections, of a median projection of the posterior end of the body. Alum 

 cochineal. X I95- The body walls are shown in outline, ag, ag, acetabular 

 glands; d, d, d, groups of ductules which are distributed in the hypodermis; g^, 

 eighth ganglion; gn, posterior ganglionic mass; «, terminal bundle of nerves; cc, 

 chloragogue cells; ec, ciliated epithelium of intestine; bs, blood sinus; a, anus; 

 va '', terminal vascular arch. 



Fig. 6. Diagram of a lateral gland, shown as though partly cut open to exhibit 

 internal structure. 



Fig. 7. Transverse section through the major annulus of the ist somite. 

 Borax carmine. X 195. Ig, lateral glands; gv, gv, ventral, and gd, gd, dorsal open- 

 ings of ductules; h, heart; vc, the internal chain of valve cells; ce, oesophagus; 

 nc, nerve cord; sn, supra-neural blood vessel; g, ganglion; va, portion of fifth 

 vascular arch; Im, longitudinal muscle fibres; hy, hypodermis. 



Fig. 8. Cross-sections of four forms of longitudinal muscle fibres. Haem. 

 X 500. 2d somite. 



