PLATE 48.
Fig. 1.—A row of intermaxillary teeth of
the Hypostoma. Fig. 2. Four intermaxillary
teeth of the Rhynelepis. Fig. 3.
Five intermaxillary teeth of the Acanthi-
cus. Fig. 4. Reduced view of the bones
of the upper and lower jaws of the Sudis
gigas; a, intermaxillary ; b, maxillary;
c, palatine ; d, pterygoid ; e, vomer; f ,
premandibular; g, articular; h, suran-
gular; i, angular. Fig. 5. Teeth of the
upper jaw of Sudis gigas: f , f , basi-
sphenoid. Fig. 6. Lingual bone with
anterior and posterior groups of teeth,
(Sudis gigas). Fig. 7. Dental system of
Osteoglossum : a, intermaxillaries ; b,
maxillaries; c, palatines; d, vomer, e,
lingual bone. Fig. 8. Teeth in situ of
Serrasalmo. Fig. 9. Intermaxillary, maxillary,
palatine, vomerine, premandibular,
and lingual teeth of a salmon. (Salmo
salar.) Fig. 10. Similar- view of the
teeth of Myletes. Agassiz*
PLATE 49.
Fig. 1.— Intermaxillary teeth of a Parrot-
Fish (Scarus muricatus). Fig. 2. Skull
of a Scarus with two of the intermaxillary
teeth, on each side, prominent and
pointed. Fig. 3. Premandibular bone,
cleft vertically near the symphysis, of
Scarus muricatus: a, one of the last-
formed denticles; b, dentiparous cavity.
Original.
PLATE 50.
A longitudinal section of a single denticle
of the Scarus muricatus: magnified.
Original.
PLATE 51.
Fig. IS—Vertical section of an upper pharyngeal
bone and teeth of Scarus muricatus.
Fig: 2. Dentigerous surface of
the two upper pharyngeal bones of ditto.
Fig. 3. Lower pharyngeal bone and teeth
of ditto. Original.
PLATE 52.
Fig. 1.—Vertical section of five pharyngeal
teeth of Scarus muricatus, nat.
size. Fig. 2. Section of a single tooth
magnified 150 linear diameters, (reduced
view). a. Osteo-dentine : 5. dentine:
c. enamel: d. cement. Fig. 3. Termination
of a single dentinal tube, magnified
700 linear diameters. Original.
PLATE 53.
Fig. 1. Portion of under jaw of the Barracuda
Pike (Sphyroena Barracuda), a, a,
orifices of concealed alveoli of successional
teeth. Fig. 2. Longitudinal section of
apex of one of the teeth, magnified 250
linear diameters. Original.
PLATE 54.
A longitudinal section of a fossil Sphyrenoid
Fish (Sphyrænodus prisais, Agassiz ; Dic-
tyodus, mihi) : magnified 150 linear diameters.
PLATE 55.
A part of a longitudinal section of the
tooth of the Saurocephalus lanciformis ;
magnified 250 linear diameters. A detached
tooth and two in situ are added
of the natural size. Original.
PLATE 56.
Fig. 1.—A portion of the lower jaw of
the Angler (Lophius piscatorius). a, a.
Outer row of teeth : b, b. Inner row
of teeth;Spix, Pisces Brasilienses, 4to. one of these is bent down,
and the outline shows it as restored by the
spring of the elastic ligaments at the
base. Fig. 2. Vomerine and premandibular
teeth of the hroad-nosed Eel
(Anguilla latirostris). Fig. 3. Skull and
teeth of a smaller specimen of the same
Yarrell. Fig. 4. Skull and teeth of
Murtena anguiceps. Fig. 5. Jaws and
teeth of Murtena tigrina: a, vomerine
teeth : b, maxillary teeth. Original.
PLATE 57.
Fig. 1.—Lower pharyngeal teeth, in situ,
of a Barbel (Bar vulgaris) a, a probe
passed from the mouth, through the
pharynx; b, protractor pharyngis; c,
retractor pharyngis. Original. Fig. 2.
Separate lower pharyngeal hone and teeth
of the Barbel. Yarrell. Fig. 3. Outer
row of pharyngeal teeth of Schizothorax
esocinus. Fig. 4. Lower pharyngeal bone
and teeth of the Roach (Leuciscus rutilus)
Yarrell. Fig. 5. Pharynx of the Tench
(Tinea vulgaris), opened from below, and
the two pharyngeal bones and teeth divaricated
; a, the occipital pharyngeal: b,
the sesophagus. Fig. 6. A similar view
of the pharynx of a Carp (Cyprinus
Carpia); a, the occipital pharyngeal
p late; b, part of a cell in the fleshy
pharynx cut open, to show ; c, the germ
of a pharyngeal tooth. Fig. 7. One of
the lower pharyngeal bones and teeth with
part of the other bone anchylosed to it,
of an old Carp. Fig. 8. Basal pulp-
cavity of a large pharyngeal tooth, Carp.
Original.
PLATE 58.
Fig. 1.—Portion of a pharyngeal tooth and
its formative pulp, showing the peripheral
cells of the latter and the
connection of the tubes of the calcified
part with the nuclei of the cells. The
areolar character of the calcifying surface
of the pulp is shown at the lower comer
of the figure. Fig. 2. Base of the pharyngeal
tooth of a Barbel. Original.
PLATE 59.
Fig. 1.—Side view of the skull and teeth of
the Lepidosiren (Protopterus) annectens.
Fig. 2. Front view of the same. Fig. 3.
Oral surface of the intermaxillary, maxillary
and mandibular teeth of ditto. Fig. 4.
Reduced view of a vertical section of
maxillary dental plate, magnified 120
diameters, of the Protopterus annectens.
PLATE 60.
Fig. 1.—Upper and lower jaws and teeth of
the Wolf fish, (Anarrhichas Lupus), a,
intermaxillary : b, maxillary: c, palatine.
Fig. 2. Premandibular bone and teeth
cleft vertically near the symphysis of
ditto. Original.
PLATE 61.
Fig. 1.-—Lower jaw and teeth of Wolf-fish.
Fig. 2. Oral surface of, a, intermaxillaries,
b, palatines, and, c, vomer, with
their teeth. Original.
PLATE 62.
Fig. 1.—Side view of the skull and teeth of
Menopoma Alleghanniense. Fig. 2. Base
of skull with intermaxillary, maxillary
and vomerine teeth of ditto. Fig. 3.
Skull and teeth of the Proteus anguinus.
Fig. 4. Base of skull of Axolotes mexi-
canus ; a, intermaxillary ; b, maxillary ;
c, vomer; d, pterygoid. Fig. 5. Skull
and teeth of Siren lacertina. Fig. 6.
Base of skull of ditto. Fig. 7. Base of
skull of Amphiuma tridactylum. Fig. 8.