1907.] NATURAL SCIENCES OF PHILADELPHIA. 143 



Figs. 20a-6. — Two consecutive coronal sections tliroupili one of the neph- 

 ridia of the first pair; fig. 2Go lying uppermost. Corrosive-acetic. 

 V lllo. 



Fig. 27. — Three cells of the ciliated hand of the first trunk segment, from a 

 tangential section. FkMuniing's fluid. X III.t. 



Fig. 28. — Tlie second cephalic ciliated band and the ciliated groove, from a 

 tangential section. X 1115. 



Fig. 29. — The ventral hypodermis, showing ciliated and non-ciliated cells, 

 from a horizontal section. X 665. 



Fig. 30. — Cross section through the proboscis, showing two layers of the 

 intrinsic muscle fibres. Flemming's fluid. X 665. 



Figs. 31 and 32. — Degenerating cells of the oesophageal wall. Corrosive- 

 acetic. X 1115. 



I''ig. 33. — A spherical Ijody with its accompanying nucleus, from the stomach 

 wall. Corrosive-acetic. X 1115. 



Fig. 34. — Digestive gland, from the stomach wall. Corrosive-acetic. X 

 1115. 



Fig. 35. — Cells from the stomacli wall. Flemming's fluid. X 665. 



