A. J. Grove 
27 
p. m. 
pli. 
r. m. 
sal. gl. ant. 
sal. gl. d. 
sal. gl. post, 
sc. 
st. 
sub. oes. g. 
th. g. 1, 2, 3. 
tr. b. 
u. 
va. 
v. br. 
v. conn, 
vu. 
Small protractor muscle of the posterior setae. 
Pharynx. 
Retractor muscles of the setae. 
Anterior salivary glands. 
Duct of salivary glands. 
Posterior salivary glands. 
Setae. 
Stigma. 
Sub-oesophageal ganglion. 
1st, 2nd and 3rd thoracic ganglia. 
Transverse bar. 
U-shaped piece of chitin which serves as the origin for the large protractor 
muscle. 
Vagina. 
Ventral branch of trachea. 
Ventral connecting trachea. 
Vulva. 
EXPLANATION OF PLATE I. 
All drawings were made with the camera lucida unless otherwise stated. 
Fig. 1. General frontal view of chitinous framework after preparation with caustic 
potash to clear away all the muscles. ( x 230.) 
Fig. 2. Transverse section across the tip of the labrum to show the setae cut across. 
(x 1050.) 
Fig. 3. Longitudinal horizontal section across the lower part of the head to show the 
chitinous rods joining on to the bases of the setae. ( x 355.) 
Fig. 4. Longitudinal vertical section through the head to include one end of the trans¬ 
verse bar. (x 108.) 
Fig. 5. Transverse section through the head to show the course of the large protractor 
muscle. (x 108.) 
Fig. 6. The insertion of the large protractor muscle into the transverse bar. ( x 355.) 
Fig. 7. Origin of the large protractor muscle. ( x 630.) 
Fig. 8. Transverse section through the oesophagus. ( x 630.) 
Fig. 9. Transverse section through the crop. ( x 315.) 
Fig. 10. Transverse section through the coiled intestine. ( x 315.) 
Fig. 11. Transverse section through the rectum. (x315.) 
Fig. 12. Median longitudinal vertical section through the head to show the pharynx and 
the muscles which dilate it. (xl08.) 
Fig. 13. Longitudinal section through the crop to show the insertion of the oesophagus 
and the post-mortem appearance of the contents. ( x 355.) 
Fig. 14. Longitudinal section through a part of the rectum to show the muscle fibres in 
the wall. ( x 355.) 
Fig. 15. Longitudinal section through an anterior salivary gland. ( x 630.) 
Fig. 16. Longitudinal section through a posterior salivary gland. ( x 630.) 
Fig. 17. Transverse section through the body in the region of the posterior salivary 
gland to show the duct from the gland passing round the nervous system to the mid- 
ventral line. ( x 152.) 
