1 83 



WHITMAN. 



[Vol. I. 



EXPLANATION OF PLATE VI. 



Reference Letters. 



c, coelom. 



d, ducts of larval gland-cells. 

 e«, entoderm. 



ejip, entoplasts. 



ep, epidermis. 



g, ganglia. 



gl, larval gland-cells. 



m. mesoderm. 



nc, nerve-cord. 



7il, neurilem. 



p, proboscis. 



s, septa. 



sb' , anterior pair of sense-bulbs. 



5^/, salivary glands. 



sp, somatopleure. 



spp, splanchnopleure. 



st.d, stomodaium. 



sub.fe.g, suboesophageal ganglia. 



sup.ce.g, superoesophageal ganglia. 



tr, transverse nerve-fibres. 



J, yolk. 



Fig. 20. C. parasita. Median sagittal section of an embryo in which the 

 germ-bands are one-half closed. X 280. 



Fig. 21. Similar section of a stage in which the germ-bands are nearly 

 closed. X 280. 



Fig. 22. Middle region of ventral side (from the same section), showing 

 entoplasts in the periphery of the yolk. X 2S0. 



Fig. 23. Transverse section through the region of the larval gland-cells at 

 time of hatching. X 280. 



Fig. 24. Near the middle of the ventral side. From a sagittal section fol- 

 lowing that seen in Fig. 28. 



Fig. 25. C. marginata. Nine days old. Longitudinal section of one of 

 the anterior gastric diverticula. The dorsal half alone is shown. X 280. 



Fig. 26. C. parasita. Same series as Fig. 28. Middle region of ventral 

 side, showing the septa and an early stage of the entoderm. X 465. 



Fig. 27. From the same section, nearer the hind end. X 465. 



Fig. 28. Median sagittal section at time of hatching. X 280. 



Fig. 29. Sixth section from that shown in Fig. 28. X 280. 



