Apr., 1889. 
FORAMINIFERA OF OBAN. 
79 
Description of the Specimens. 
1. Biloculina ringens . Lamarck, 1804. 
Williamson (R. F.), 1858, p. 79, pi. vi., figs. 169-70-71. 
Balkwill and Wright (J. F.), 1885, pi. 12, figs. 6-7. 
Robertson. D. (W. S.), 1874, common. 
Prof. Williamson’s figures give a good guide to the 
knowledge of this species, and as Mr. J. Wright 
remarks the B. elongata is merely an elongated 
form of B. ringens , and as the two forms pass 
into each other tliev can onlv be considered 
%/ %j 
as varieties of one form. Common. 
2. Biloculina depressa. D’Orbigny, 1826. 
Williamson (R. F.), 1858, p. 79, pi. vii., figs. 172-4. 
Balkwill and Millett (Galway), 1884, p. 5. 
Robertson, D. (W. S.), 1874, common. 
An oval, flattish form, with sometimes a broad carinate 
edging on each side. Common. 
8. Spiroculina limbata. D’Orbigny, 1826. 
Williamson (R. F.), 1858, p. 82, pi. vii., fig. 177. 
Robertson, D. (W. S.), 1874, common. 
Oban, 1888. Very rare. 
4. Miliolina trigonula. Lamarck, 1804. 
Williamson (R. F.), 1885, p. 84, pi. vii., figs. 180-2. 
Robertson, D. (W. S.), 1874, common. 
Oban, 1888. Not common. 
5. Miliolina oblonga. Montagu, 1803. 
Williamson (R. F.), 1858, p. 84, pi. vii., figs. 186-7. 
Robertson, D. (W. S.), 1874, frequent. 
An elongated form, allied to M. seminulum. Rare. 
6. Miliolina seminulum. Linne, 1767. 
Williamson (R. F.), 1858, p. 85, pi. vii., figs. 183-5. 
Robertson, D. (W. S.), 1874, common. 
Oban, 1883. Frequent. 
7. Miliolina subrotunda,. Montagu, 1803. 
Balkwill and Wright (J. F.), 1885, p. 324, pi. xii., 
figs. 8-9. 
Balkwill and Millett (G.), 1884, p. 6. 
Robertson, D. (W. S.), 1874, common. 
Often very circular in outline. Common. 
8. Miliolina secans. D’Orbigny, 1826. 
Williamson (R. F.), 1858, p. 86, pi. vii., figs. 188-9. 
Balkwill and Millett (G.), 1884, p. 6. 
Robertson, D. (W. S.), 1874, frequent. 
A peculiar, large flattened form. It is proposed by 
M. Sclilumberger to place it with others under 
the generic name Sigmoilina ( Sigmoilina secans, 
D’Orbigny). Rare. 
