142 rROCEEDIMGS OF THE ACADEMY OF [Feb,,. 



Fig. 3. — Cross section through the anterior portion of the mouth, showing 

 the openings of the duets of the salivary glands, the oesophageal muscles, 

 the oesophageal nerves, and the longitudinal muscles. X 665. 



Fig. 4. — Cross section through the posterior portion of the mouth, showing 

 the oesophagus, the proboscis, and the ducts of the salivary glands. 

 X 665. _ ^ 



Fig. 5. — Cross section through the trunk, just posterior to the mouth, show- 

 ing the salivary glands, the muscle-nerves, besides the features repre- 

 sented in the preceding figure. X 665. 



Fig. 6. — Cross section through the trunk, taken at the level of the 3d trunk 

 segment, showing the stomach, the longitudinal muscles, and the- 

 lateral nerve cords. X 665. 



Fig. 7. — Cross section through the posterior portion of the trunk, at the level 

 of the anterior half of the 6th trunk segment, showing the intestine, the 

 ovary, and the peritoneum enveloping it. X 665. 



Fig. 8. — Cross section through the posterior end of the trunk, just anterior 

 to the anus, shomng the hypodermal glands on the dorsal side, and the 

 intestine A\dth a sphincter muscle encircling it. X 665. 



Fig. 9. — Cross section through the ventral hypodermis in the posterior por- 

 tion of the 3d trunk segment, and passing through the posterior com- 

 missure of that segment. Ganglion cells and a portion of a nephridium 

 are also shown. X 665. 



Fig. 10. — The eye, from a coronal section, showing the bilobed lens, the pig- 

 ment cup, aiid the adjacent ganglion cells of the brain. Flemming's 

 fluid. X 1115. 



Fig. 11. — Problematical sense organ, also insertion of the oesophageal muscles 

 on the hj-podermis. Corrosive-acetic. X 1115. 



Fig. 12. — Portion of a coronal section through the head, showing one of the 

 two tufts of tactile cilia borne on the anterior surface of the latter, and 

 the connection of the cilia-bearing cells with the ganglion cells of the 

 brain. Flemming's fluid. X 1115. 



Fig. 13. — Two muscle fibres from one of the diagonal muscles of the head, 

 showing the nucleus and cell body attached to the fibres. X 1115. 



Fig. 14. — Section through a portion of the ventral hypodermis, showing 

 ciliated and non-ciliated cells, the cuticle, and also the median ventral 

 longitudinal muscle fibres. Flemming's fluid. X 1115. 



Figs. 15-17. Hypodermal glands of the first, second and third types, 

 respectively. X 1115. 



Fig. IS. — Four glands from the dorsal hypodermis of the posterior end of the 

 trunk. Three of them are non-nuicous glands (gl. 3.); the remaining 

 one (ql. 2.) contains mucus. X 1115. 

 Plate XIII, Fig. 19. — Coronal section through head, showing the brain and the 

 insertion of the longitudinal nuiselcs. X 665. 



Fig. 20. — Coronal section through head, taken at a lower level tlian the 

 figure preceding, showing the transverse commissure of the brain, the 

 orign of the circumoesophageal commissures, and the preoral commis- 

 sure. X 665. 



Fig. 21. — Ovary, from a sagittal section. The ventral hypodermis is also 

 represented, as well as the outlines of the stomach and intestinal walls. 

 X 665. 



Fig. 22. — Cephalic gland, drawn from two sagittal sections. The outlines 

 of tlie neuropil, of ganglion cells, and of a hypodermal cell are also 

 indicated. Flemming's fluid. X 665. 



Fig. 23. — Sagittal section through the head and anterior portion of the trunk,. 

 showing the brain, the preoral transverse commissure, the mouth, the 

 oesophagus, the proboscis, and muscle insertions. X 665. 



Fig. 24. — Portion of the lateral body-wall of tlie 3d trunk segment, showing 

 the inner end of the right member of the second pair of nephridia. 

 Corrosive-acetic. X 1115. 



Fig. 2oa-e. — Five consecutive cross sections through the left nephridium of 

 the first pair; fig. 25a being the most anterior of the series. Corrosive- 

 acetic. X 1115. 



