576 
J. S. KINGSLEY. 
Fig. 35. — Transverse section through the middle of the fourth segment of 
Fig. 14, showing the segmental organs and the origin of the nerve to the 
fourth pair of appendages, x 75. 
Fig. 36. — Section through the metastoma (ep) of Fig. 14, showing the 
mesoblastic outgrowths ( co ) to form the artery surrounding the ventral 
nervous cord. X 150. 
Figs. 37 and 38. — Longitudinal section of abdominal appendages, Fig. 14, 
showing the mode of formation of the gill-lamellse, the inpushing being as 
marked as the outgrowths. Compare with Fig. 19. 
Fig. 39. — Origin of deutovum as a cuticle secreted by the blastoderm. 
The section is taken from an egg in the stage represented in Fig. 4. x 300. 
Figs. 40 — 43. — Transverse sections of the mouth region of Fig. 6, illustra- 
ting the formation of the stomodeum by a closing-in of the epiblast. Fig. 40 
is the most posterior. X 200. 
Fig. 44. — Transverse section of the germinal area of Fig. 4, showing the 
origin of the mesoblast from the elongate “germinal groove” (modified 
blastopore). 
Fig. 45. — Relative proportions of blastoderm and deutovum at the stage 
shown in Fig. 5. 
Fig. 46. — Transverse section through anus of Fig. 5. X 175. 
Fig. 47. — Transverse section through the fourth pair of appendages of 
Fig. 5, showing the extension of the mesoblast and the absence of a coelom at 
this stage. 
