A472, MR. B. F. CUMMINGS ON 
schein.” As a result of my study of these palpi, no very clear 
or concise expression of the manner in which this is done can be 
offered. No longitudinal muscle-fibres as they occur, for example, 
at the base of scent hair-tufts in some Butterflies, were discovered 
attached to the bases of the hairs. A circular muscle around 
the hair within the alveolus, but at some point above the base, 
would serve to erect the hair. No such muscle has been detected. 
Text-figure 8. 
Sericostoma personatum. 
A. Portion of the glandular epithelium, enlarged. Actual width varies from 
053 to °03 of a millimetre. 
B. Some trichogen cells very greatly enlarged. 
Reichert objective ;'y homog. imm., with eyepiece No. 4 was used for the 
examination of the cells. ‘The drawings are free-hand. 
A, Alveolus. H. Hair. PC. Pore-canal. WV. Nucleus. 
It remains to consider the action of the stout muscle-fibres in 
the edge of the septum previously described. Their course is 
longitudinal from the base of the palpus to near the end. The 
result of their contraction would be to draw down the tip of the 
palpus and so make the convex outer margin still more convex, 
