=04 APPENDIX I. 
ral surface throughout evenly convex. Surface smooth, faintly subplicate concentrically. 
Anterior muscular impression a little excavate, short sub-elliptical, marginal. Length 14 
inches ; height #44, L.; apical angle about 1382°.—Plate 9, fig. 2, natural size. 
Modiolopsis simplex, Exped. Foss., Amer. Jour. Sci., ii. Ser., iv. 158. 
61. Cypricarpia (AvicuLa?) veNnERIs (Dana).—Thin; much elongate, narrower 
anteriorly, elliptic posteriorly, with a long cardinal margin. Sides somewhat excavate 
beneath the beaks, and inferior margin correspondingly excavate. Surface somewhat 
convex, and not carinate posteriorly, long radiate; costate over the middle and posterior 
surface, the lower coste a line or more apart at the margin, the upper nearer ; also faint 
concentric lines of growth, and faint undulations.—Length 2,5 inches; greatest height 
about 4°, L.; below the beak, height somewhat more than half the greatest height. 
Plate 9, figs. 3 a, b, an external cast, imperfect, natural size. 
Glendon, valley of the Hunter. 
62, AvicuLa voicEnsis? (Vernewi/).—Plate 9, fig. 4. An imperfect specimen, 
natural size, from Wollongong, Illawarra. The specimen does not give the complete 
form of the species. The coste are fine, and appear to differ from those of the volgenszs, 
(Russia, 473, pl. 41, fig. 13,) in frequently subdividing, or being less regular, and as 
close and fine at the lower margin as above. 
63. Prerrnea macropTeRA (J. Morris).—Our specimen is an imperfect one, and we 
venture no remarks upon it. It is from Illawarra. 
Pterinea macroptera, J. Morris, in Strzelecki’s New South Wales, p. 276, pl. 13, figs. 2, 3. 
64. Pecren comptus (Dana).—Orbicular, 20-22 larger coste, obtusely triangular, 
with the sulci broadly concave, and occupied with a medial costa, and 1 to 3 smaller ; 
costes naked, without markings or transverse striae. Ears large, longitudinally marked 
with fine diverging costee. Length and height 23 inches; distance, at the lower margin, 
between the middle of two larger coste, ; to nearly 7 inch.—Plate 9, fig. 5, natural 
size. 
Harper’s Hill. 
The specimen is a single convex valve, The shell is white and well preserved, and is 
less than a third of a line thick. 
Pecten comptus, Exped. Foss., Amer. Jour. Sci., ii. Ser., iv. 160. 
Pecten sub-5-lineatus (?) M’Coy, Ann. & Mag. Nat. Hist., vol. xx., p. 298, pl. 17, fig. 1. 
M’Coy’s specimen (from Harper’s Hill) was a little larger than ours, and this may account for 
the occurrence, in some instances, of five intermediate coste. 
65. PEcTEN LENIUscuLUs (Dana).—Large, plano-convex, orbicular. Surface concen- 
trically sub-undulate, nearly smooth, minutely costate or fine striate, costee without cross 
strie or markings, rather more distant, and somewhat larger on the convex valve. Ears 
large, subequal, transversely undulate and longitudinally striate—Length and height 43 
inches ; thickness 12 inches ; apical angle, excluding the ears, 100°.—Plate 9, figs. 6 a, 
6 6, different sides, natural size. 
District of Illawarra. 
