OF THE MARSIPOBRANCH FISHES. 
433 
between the cushions that contain them, sharp yellow teeth are seen—the “ supra- 
lingual” teeth ( s.l.t.) (see Plate 14, fig. 9). 
7th Section (Plate 20, fig. 7).—In this, the same parts are cut through as in the 
last, but they are different in form and position. The great cornu ( c.tr.) is but little 
changed, but the median labial plate ( u.l 1 .) is considerably contracted, at this, its hinder 
margin. We see the wedge-like point of the second lateral upper labial (u.l 5 ) above, 
and the paired distal mandibulars ( l.d.m.) below; these are getting further apart. 
The median piece ( m.cl.m .) is now much narrower, being severed behind its dilated 
part; the main basi-hyal is as in the last, but its wings ( b.hy".) are vertical in this 
section, and so are the small supra-linguals ( s.l.c .) between them ; we still see the 
teeth (s.l.t.) between the cushions. The section of the great disk is lessening towards 
its hind margin. 
8 th Section (Plate 20, fig. 8).—The oral opening is now becoming very contracted, 
the great roofing cornu (c.tr.) is of undiminished size, but the large median labial (u.l 1 .) 
only shows its postero-inferior angles, right and left. The second lateral pair (u.l 5 ), which 
wedges in between the two roof-pieces, is now trilobate in section, and larger ; the 
distal mandibulars ( m.d.m., l.cl.m.) and main basi-hyal ( b.hy.) are much as in the last 
section, but the paired lobes of the basi-hyal are gone ; only a small part of each supra- 
lingual (sic.) is seen. 
9th Section (Plate 20, fig. 9).—The roofing cornu (c.tr) is narrower here, and its 
lower edges are thickened instead of being sharp. The upper median labial is not 
seen, but the second lateral piece (u.l 5 .) is now a large slab ; it is ^-shaped in section, 
vertically placed, thick edged above and thin below. The distal mandibulars (m.d.m., 
l.d.m.) are smaller, and so are the supra-linguals (s.l.c.) ; the main basi-hyal (b.hy.) 
keeps its form. This section is through the last fold of the suctorial disk, which is 
here seen to be quite free from the rest of the section, and to have lost its lower gap. 
1 0th Section (Plate 20, fig, 10).—This section is behind the lips, and only one pair 
of labials, the second upper lateral (u.l 5 .) are cut across ; they are thinner here than in 
the last. The great cornu (c.tr.) is one-third narrower ; the distal mandibulars (m.d.m., 
l.d.m.) are getting less and less; the main basi-hyal (b.hy.) is much the same, and 
the tongue (tg.) is cut through behind the cartilages and teeth. 
1 1th Section (Plate 20, fig. 11).—The great cornu (c.tr.) is gaining in thickness, but 
losing its width; the second lateral labials (u.l 5 .) are cut through their hind margin; 
the other parts are much as in the last section. The small elevation at the top is the 
beginning of the nasal opening (e.n.). 
12 th Section (Plate 20, fig. 12).—In this section the outer nasal opening (e.n.) is 
laid open above the proximal part of the cornu trabeculae (c.tr). Here the oral cavity 
(m.) is a large oblong space, partly occluded, below, by the lingual apparatus, in 
the base of which we see the vertical basi-hyal (b.hy). Opposite the middle of that 
bar the postero-inferior angle of the large lateral labial (u.l 5 ) is cut across, and the 
points of the three distal mandibulars (m.d.m., l.d.m.) are still seen in section. 
