G? 
'IS 
WC, K 
/SHM 
V<10 
EXPLANATION OF PLATES. 
PLATE 1. 
Fig. 1. Urosthenes Australis, natural size ; 1 a, part of two 
rays of the dorsal tin, enlarged. — p. 681. 
Fig. 2. Terebratula amygdala; a, b, c, d, different views, 
natural size ; e, lower margin from another specimen ; f internal 
structure, magnified 40 diameters. — p. 682. 
Fig. 3. Terebratula elongata; a, b, different views, natural 
size ; c, d, internal structure, magnified 40 diameters. — p. 682. 
Fig. 4. Terebratula ? — p. 683. 
Fig. 5. Terebratula? — p. 683. 
Fig. 6. Spirifer glaber, a, b, specimen from Black Head, Illa- 
warra, natural size; c, d, from Harper’s Hill; e,f distorted, from 
Harper’s Hill; g, surface of c, magnified 3 diameters.— p. 683. 
Fig. 7. Spirifer Darwinii; a, cast, with internal spiral sup- 
port in view ; b, broken valve. — p. 684. 
PLATE 2. 
Fig. 1. Spirifer duodecicostatus ; a, b, natural size. — p. 684. 
Fig. 2. Spirifer ? natural size. — p. 684. 
Fig. 3. Spirifer vespertilio; a, b, c, natural size. — p. 685. 
Fig. 4. Spirifer phalaena, a fragment, natural size. — p. 685. 
Fig. 5. Siphonotreta ? curta; a, b, natural size. — p.685. 
Fig. 6. Lingula ovata ; a, b, natural size. — p. 685. 
Fig. 7. Productus fragilis; a, b, c, natural size; d, profile of 
section. — p. 686. 
Fig. 8. Productus brachythjerus, natural size. — p. 686. 
Fig. 9. Solecurtus ? elliptic.us, natural size. — p. 686. 
Fig. 10. Solecurtus (Psammobia?) planulatus. — p. 686. 
Fig. 11. Pholadomya (Platymya) undata; a, b, natural size. 
— p. 687. 
Fig. 12. Pholadomya (Homomya) glendonensis, natural size. 
— p. 687. 
PLATE 3. 
Fig. 1. Pholadomya (Homomya) audax; a, b, c, natural size. 
— p. 687. 
Fig. 2. Pholadomya (Homomya) curvata; a, b, natural size. 
— p. 688. 
Fig. 3. Astartila? corpulenta; a, b, c, natural size. — p. 691. 
Fig. 4. Astarte gemma, internal cast, natural size; a , cast of 
exterior ; b, enlarged, showing cast of hinge. — p. 688. 
Fig. 5. Astartila intrepida, natural size ; a, dorsal view ; b, 
larger anterior muscular impression, enlarged ; c, smaller anterior 
muscular impression. — p. 689. 
Fig. 6. Astartila cyprina, internal cast, natural size; a, dorsal 
view; b, large anterior muscular impression (from cast), with 
commencement of palleal impression; c, d, small anterior from 
different specimens. — Figs. 7 a, 7 b, same species? — p. 689. 
PLATE 4. 
Fig. 1. Astartila cytherea, natural size, exterior cast, show- 
ing surface of shell ; a, dorsal view of same, showing ligament of 
hinge ; b, c, d, views of an internal cast ; e, larger anterior mus- 
cular impression from cast, enlarged ; f smaller ditto; g, posterior 
ditto. — p. 689. 
Fig. 2. Astartila polita, natural size; a, lateral view of in- 
ternal cast; b, cast with portion of shell remaining; c, dorsal 
view of cast. — p. 690. 
Fig. 3. Astartila cyclas, exterior cast, showing hinge liga- 
ment; a, dorsal view of same; b, c, interior cast; d, anterior mus- 
cular impression, enlarged ; e, posterior ditto. — p. 690. 
Fig. 4. Astartila transversa, internal cash natural size; a, 
front view of same ; b, dorsal ; c, d, anterior muscular impressions 
from cast, enlarged. — p. 690. 
Fig. 5. Cardinia recta, natural size, showing exterior in part; 
a, imperfect, showing internal cast; b, profile of vertical section 
of cast. — p. 691. 
Fig. 6. Cardinia Cuneata, internal cast, natural size ; 6 a, 
another specimen; b, e, other views of 6 a; c, d, other views of 
6.— p. 692. 
Fig. 8. Cardinia costata, natural size; a, partly internal cast; 
b, dorsal view of same ; c, profile of vertical section. — p. 692. 
PLATE 5. 
Fig. 1. Pachydomus cuneatus, natural size; a, b, different 
views of cast. — p. 693. 
Fig. 2. Pachydomus antiquatus, natural size; cast with por- 
tion of shell. — p. 693. 
