288 
In the later stages these processes are concealed by the hairs. 
They are invariably pale, whitish, the cuticle is smooth and naked, 
not bearing any sete or hairs, differing in this respect from the 
fleshy digitiform processes or soft tubercles of the larva of Attacus 
and of certain Papilionide. 
To examine the structure of these processes transverse sections of 
the larvee of Stage I were made, and also blocks of the integument of 
the full-fed larva bearing two of the processes were cut with the 
microtome. Fig. 11 represents a transverse section of the body 
of the larva before the first molt, involving the lateral grandular 
processes on each side of an abdominal segment; zwz¢., intestine, 
with the epithelial or mucous layer enclosing vacuoles, and m., 
the outer or muscular layer ; #., section of four of the Malphigian 
or urinary tubes; 2, ¢., the ganglia; A7., the heart ; 7, cells of the fatty 
body ; sc., thickened portion of the hypodermis (Ay.) lying under 
the tubercles and modified into the setigenous cells; 7, the ab- 
dominal legs ; #., muscles ; m’., a pair of muscles inserted near the 
base of the lateral glandular processes ; cu¢., cuticle. The lateral 
grandular processes (/ g f) are seen to be inserted a little below the 
middle of the segment, and that they are permanently evaginated 
is seen by the nature of the cuticle, which is rough and subspinu- 
lated on the basal third. The process is filled with elongated 
gland-cells. 
Fig. 12. represents different sections, 1°-17 through the pro- 
cess of one segment, and 2, 2°, 2” through another, the lettering as 
before. 
Longitudinal (A, B, C) and a transverse section (D) through 
these processes in the fully fed larva are represented by Fig. 13. 
At A the lumen (/) is a deep narrow cavity, with the secretion 
(secr.) collected at the mouth of the cavity composed of a thin 
mucous-like coagulated fluid, containing granules of varying de- 
grees of fineness which take the stain readily. Outside of these are 
collected fine zucle¢ (4, c), stained dark and enveloped in a slight 
transparent pale protoplasmic envelope, which may be blood-cor- 
puscles. The glandular cells themselves are simply modified 
hypodermal cells, as seen at C, those at the free end of 
the process are very much elongated, the nucleus however situated 
near the periphery of the process. In some of the nuclei, indis- 
tinct nucleoli are seen, and deeply stained granules, especially 
around the periphery of the nuclei. The specimens had been in 
