ON AMPHIPORUS SPECTABILIS. 283 
in the body-wall and body-cavity, and it is of little avail 
here as a help to make improvements on the interpreta- 
tions already advanced. ‘The transverse slips (¢, e,) 
between the great longitudinal columns of the reticulated 
layer are part and parcel of that layer, and their continuity 
therewith causes the edges of each column in contracted 
specimens to assume a denticulated aspect. Moreover, they 
form a complete separation between the outer and inner 
longitudinal fibres, their only connection with the latter being 
perhaps the transmission of a few fibres between the fasciculi, 
but I have nothing to advance in support of this except the 
zig-zag processes on the transverse slips, seen in the everted 
organ (PlateXV, fig. 1, e’, e’,). Such a connection, at any rate, 
is of little import in the case. Dr. Hubrecht next doubts 
the muscular character of the circular muscular layer, (c, 
Plate XV, fig. 1), which has been found in every member of 
the EnopLa examined. ‘The figures connected with the 
present communication have not been seen, (he refers to 
*‘ circular layers, ef, and c f”’), but if a longitudinal section 
be made of the organ (e. g., op. cit., Ray Society, Plate XI, 
fig. 7), he will find the cut ends of the circular muscular 
layer (c), and perhaps his ‘‘ interlaced elastic tissue”? between 
them; moreover, he will see the cut ends of the transverse 
shps (e’, e’,) connecting the longitudinal columns of the 
reticulated layer (Cif the knife goes between the latter 
columns), which with other facts show the propriety of indi- 
cating a separation of the longitudinal fibres into two layers. 
No sound interpretation will make the cut ends of these 
transverse slips in such a section appear only as the “ bands 
of fibrous elastic tissue, which at the same time traverse the 
longitudinal muscular coat in all directions, and originally 
depart from the external and internal layer of elastic tissue,” 
the more especially as one of the latter is a circular muscular 
coat(c). All this has already been clearly shown in former 
publications and drawings. 
With regard to the structure of the stylet-region in this 
form there seems to be room for further minute investigation. 
Dr. Hubrecht shows (op. cit., Pl. I, fig. 3) the walls of the 
anterior chamber continued straight backwards of the same 
thickness over the stylet-region and the subsequent posterior 
region. It would be well to make transverse and other 
sections from the front of the region backwards to the pos- 
terior chamber so as to observe the change in the layers. M. 
Marion again states that “ on each side of the bulb” of the 
peculiar stylet “ there are eight or ten styligerous vesicles.” 
Dr. Hubrecht mentions that in Meckelia somatotomus, Leuck, 
