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FOSSILS OF NEW SOUTH WALES. 705 
The coste of this comparatively smooth species are about seven or eight to a breadth 
ofa fourth of an inch near the middle of the flat valve, and four or five near the lower 
margin. Jn one specimen, the convex valve near the lower margin has but three coste 
in a fourth of an inch. The flat valve is somewhat convex in its upper part, and a little 
concave below. The cardinal margin is straight. 
Pecten lenivsculus, Exped. Foss., Amer. Jour. Sci., 11. Ser., iv. 160. 
66. Pecren Tenuicotiis (Dana).—Sub-orbicular, 24-costate, costa very slender, 
subacute, smooth. Sulci shallow, nearly flat at bottom, and having an intermediate 
smaller costa. Ears moderately large. Cardinal margin straight—Length 13 inches ; 
height 14 (1 7) inches ; distance of larger costa at lower margin of valve, about 4 line. 
Apical angle, ears excluded, slightly exceeding a right angle.—Plate 9, fig. 7, natural 
size; 7 a, section of surface. 
Harper’s Hill. 
The specimen is a single convex valve, somewhat broken, and the surface of the shell 
is a little shining. 
Pecten tenuicolhs, Exped. Foss., Amer. Jour Sci., ii. Ser., iv. 160. 
67. Pecren miris (Dana).—Plate 9, figs. 8 a,b, Glendon, Like other specimens 
from Glendon, this Pecten is much broken and distorted. It appears to have been a little 
oblong and oblique, with unequal ears; surface with minute smooth costa, the larger 
with two, more minute, intermediate ; distance between larger coste at lower margin, about 
four-fifths of a line, Length 17 inches, height probably a fourth less. Apical angle, 
excluding ears, much exceeding a right angle. 
68. Pecren 1tLawarRreEnsis (J. Morris).— Plate 9, figure 9, shell, natural size ; 9 a, 
section of surface. Harper’s Hill. Morris gives Illawarra as the locality, the correctness 
of which we somewhat doubt. The species is a little higher than long, Both valves 
are convex, and 18 to 20-costate. Coste large, smooth and rounded, and separated by 
concave interstices a little broader than the costee. Apical angle, excluding ears, 80° to 
90°. Height 47 inches; length 37 inches. Ears large. Distance between the middle 
of the coste, at the lower margin, averages three-eighths of an inch. 
Pecten illawarrensis, J. Morris, loc. cit., p. 277, pl. 14, fig. 3. 
69. Pecren squamutirerus [7] Morris——An imperfect specimen of Pecten, in our 
collections from Harper’s Hill, has the coste of the size in Morris’s sguamuliferus, and 
minutely undulate above, corresponding with the appearance in Morris’s figure. The 
coste are very nearly equal, rounded, and about half a line broad an inch from the beak. 
Pecten squamuliferus, J. Morris, loc. cit., p. 278, pl. 14, fig. 1—Specimen from Van Diemen’s 
Land. 
, M’Coy, loc. cit., vol. xx., p. 298.—Locality cited, Wollongong, [query, olive-coloured 
rock of Harper’s Hill ?] 
70. ? Plate 9, figure 10, represents a portion of what appears to be a bivalve 
shell, which we do not venture to refer to a genus. It is bilobate, and appears as if it 
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