24 
tions (figs. 5, 6, 11). In most sections the median bands are seen to 
extend as very narrow structures centripetally beyond the muscle 
layer and then to become broader. In the esophageal region, espe- 
cially anterior of the brain, they are more distinct than in the inidgut 
region, and immediately back of the mouth they are connected with 
the lateral bands to form a suspensory bridge around the esophagus 
(fig. 5). , 
Lateral hamds . — The lateral bands are much more complicated in 
structure than are the median bands. Very close to the mouth they 
are rather narrow (figs. 3. 5), extending centripetally, howeyer, nearly 
to the esophagus. They may be more or less distinctly seen to be com- 
posed of two portions, one yentral, the other dorsal; each portion is 
supplied with distinct nuclei; farther caudad this diyision into a 
dorsal and a yentral portion is yery apparent. Anteriorly, where the 
band is narrow, a lateral yiew of specimens cleared in glycerine shows 
two rows of nuclei directly under the cuticle — one row in the dorsal, 
the other in the yentral portion: on cross sections of this region not 
only are these two subcuticular nuclei yisible, but in each portion a 
row of nuclei (fig. 5) is seen extending toward the esophagus. 
Beside these two rows of nuclei, a third, at first less distinct, row 
of single subcuticular nuclei (figs. 3, 5) appears situated between the 
two more distinct rows and separating them; farther caudad, as will 
be shown below, this middle row becomes more distinct. 
Centripetally of this middle row some sections seem to present a 
delicate but distinct longitudinal canal between the two (dorsal and 
yentral) halyes of the lateral band. 'Whether this is an actual canal, 
as is indicated by the sections, or whether it is an artifact due to the 
material, may possibly be better left an open cpiestion for the present, 
for there are some sections in which the canal is not distinct, while in 
some sections which are torn the tear corresponds to this apparent 
canal. The sections in question can hardly form the basis for a strong 
argument against interpreting the structure in question as a canal, for 
the latter is a delicate structure, the lumen of which might easily be 
suppressed at some points, while any tear of the section would rather 
naturally occur at this point. 
Farther caudad, for instance in the midgut region of the body, the 
lateral band presents a yery striking appearance (figs. 13-, 14). On 
examination of specimens cleared in glycerine the lateral yiew shows 
broadened dorsal and yentral halyes, in which a distinct subcuticular 
cellular structure is eyident; each cell presents a nucleus. While these 
nuclei are seen at almost any point, they appear more distinct and more 
regular near the margins of each half. The middle single row of cells 
becomes yery distinct, separating the dorsal and the yentral halyes of 
the band. 
