534 /• PERCY MOORE. 



EXPLANATION OF PLATE XXIX. 



Fig. 9. A reconstruction, from camera drawings, of a median plane projection 

 of the head, hy, hypodermis ; og, oral glands ; sg, salivary (?) gland ; ag, adhesive 

 gland ; dj, dorsal, and vj, ventral jaw ; dfn, dorsal, and vm, ventral muscular pads; 

 dpm, dorsal, and vpm, ventral protractor muscles ; drm (foremost index line) 

 dorsal, and wrw, ventral retractor muscles; Im, longitudinal muscle fibres; rm, 

 radial muscle fibres ; cm, circular muscle fibres ; ep, pharyngeal epithelium ; pc, 

 cuticle of pharynx; sga, supraoesophageal ganglion ; nc, ventral nerve cord; g'^, 

 first post-cephalic ganglion; dv, dorsal bloodvessel; sv, supra-neural blood vessel. 



Fig. id. Transverse section of the head in the region of the jaws. Kleinen- 

 berg's haematoxylin. X 195. Lettering as in Fig. 9. g, g, pharyngeal glands. 



Fig. IX. Transverse section through the middle region of the head of a larger 

 individual than 9 and 10. Klein, haem. X 195. Lettering as in Figs. 9 and 10. 

 d, d, groups of ductules passing from head glands to the lower lip ; rw ', a radial 

 muscle fibre with granular protoplasm and nucleus external. 



Fig. 12. A transverse section of the intestine in the 4th somite. Haem. 

 X 195. cc, chloragogue cells; fn, muscular coat; bs, blood sinus; vbs, ventral en- 

 largement of the sinus; hfn, muscular walls of the beginning of the heart ; vc, valve 

 cells; J, inter-cellular space; //, peritoneal corpuscles. 



Fig. 13. Longitudinal section of a portion of the intestine along the dorsal en- 

 largement of the sinus (6th somite). Alum coch. X 195. The sinus is filled with 

 deeply-stained blood fluid. 



Fig. 14. Two transverse sections through the heart. Haem. X 230. a is 

 seven sections anterior to b in the same series, and is much more contracted, m, 

 muscular walls; 7t, muscle nucleus; pn, nucleus of peritoneal cell; vc, valve cells; 

 b, their inter-cellular space. 



Fig. i 5. A transverse section across a ventral portion of the intestine in the 

 7th somite. Biondi-Ehrlich. X 500. e, ciliated epithelium; s, blood sinus; vs, 

 its ventral enlargement; m, muscular coat; /, peritoneum. 



