14 
the integument as they do in Neomenia. A ventral muscular sep- 
tum separating the intestine above it, from the longitudinal blood- 
sinus, foot and foot-gland below it, is similarly present in Proneo- 
menia (fig. 24, d). 
Important musecles are the transverse slanting bundles represent- 
ed in part in fig. 23, tf. They are of considerable thiekness and 
placed with very regular intervals between the folds of the intes- 
tine. They all spring from the inside of the muscular bodywall 
at the same height, the longitudinal line of their insertions being 
parallel to and situated somewhat below the longitudinal lateral 
nerve. They descend towards the septum, the fibres here crossing 
in different directions, partly interlaeing with those of the foot, 
partly with those of the septum etc. The regular metamerically 
divided aspect which these bundles give to the interior, after the 
intestine has been removed, when considered in connection with the 
division of the genital gland into transverse metamers is certainly 
suggestive and although for the present I cannot enter upon this 
any further, I cannot refrain from calling attention to it. 
The muscular elements which take part in the formation and 
suspension of the walls of different organs, such as the salivary 
glands, the accessory generative glands, etc, will be spoken of to- 
gether with these organs. 
An important observation of v. GrRAFF and TULLBERG upon 
Neomenia holds good for Proneomenia viz. that the stronger mus- 
cular fibres are enclosed by a delicate sheath of connective tissue, 
which forms curious transverse folds and thus gives to these 
muscles the superficial appearance of being transversely striated. 
The anterior portion of the digestive canal is provided with 
such thick muscular walls, suspended to the integument by radial 
muscles (fig. 14, fr) that it may fairly be termed a muscular buc- 
cal mass. In the walls of the reetum of Proneomenia muscles are 
limited to the very last portion, where they again form a sort of 
sphincter (fig. 34); shortly before this there is on the contrary only 
the thin cellular wall (fig. 32) superposed upon very sparse fibres 
and carrying blood between its folds, | 
