PHARYNGEAL GLAND-CELLS OF EARTHWORMS. 253 
On the So-called Pharyngeal Gland-cells 
of Earthworms. 
By 
J. Stephenson, D.Se., M.B., 
Lieutenant-Colonel, Indian Medical Service ; Professor of Zoology, 
Government College, Lahore. 
With Plate 19. 
Contents. 
PAGE 
1. Historical ...... 253 
2. Material and Methods .... 260 
3. Pheretima posthuma .... 261 ‘ 
4. Pheretima heteroch^ta , . . . 265 
5. Pheretima hawayana .... 267 
6. Lumbricid,e . . ... 269 
7. The Appearances in Young Specimens . . 274 
8. The Cells in the Lumbricid Embryo . , 279 
9. Function of the Cells .... 281 
10. Summary ...... 283 
11. References to Literature .... 284 
12. Explanation of Figures .... 285 
Historical. 
Succeeding the buccal cavity in all earthworms is a swollen 
portion of the alimentary tube, the pharynx. The usual 
description of this portion of the tube in Lumbricus may 
be given in the words of Parker and Haswell (7) : the 
“buccal cavity ... is followed by a much larger 
thick-walled, rounded chamber, the pharynx. From the wall 
vol. 62, part 3. — new series. 19 
