FAMILY 1. FORAMINIFERA. 289 
Pl. CCXCVII. Fig. 2. 
OrBICULINA NUMISMALIS, Lamarck, Anim. sans vert., vol. vii. p. 609. 
Encyclopédie Méthodique, pl. 468. f. 1. a, b, ¢, d. 
Nautilus orbiculus, Fichtel. 
Pl. CCXCVI. Fig. 3. 
OrsicuLa pepressa, Nobis. Cuvier, Régne Animal (Fortin’s edition), 
Mollusques, pl. 14. f. 2. 
Heterostegina depressa, D’Orbigny. 
SPIROLOCULINA, D’Orbigny. 
Testa suborbicularis, loculis diametricé accumulatis, orificio dente plus 
minusve complicato munito. 
Our second genus of Foraminifera, Spiroloculina, corresponds with 
the genus Miliola of Lamarck ; we follow however the nomenclature of 
D’Orbigny, and include under this head his six genera, Biloculina, Spi- 
roloculina, Triloculina, Articulina, Quinqueloculina and Adelosina, forming 
his family of ‘‘ Les Agathisteques,” to which Deshayes has since added 
another genus with the appellation of Sazicolina. They are arranged by 
D’Orbigny, in his account of the Foraminifera of the Canary Islands, in 
two sections, entitled Miliolide and Multiloculide, but Deshayes appears 
to have left them entire. The chambers of the Spiroloculine are de- 
scribed as differing from those of the preceding genus, in being dia- 
metrically clustered together, and the orifice is said to be furnished with 
a more or less complicated tooth ; the singular formation of the whorls, 
opposed to each other over their own axis, is also noticed as being re- 
markable. 
Examples. 
Pl. CCXCVIL. Fig. 4. 
SprroLocuLtina cymBium, D’Orbigny, Mollusques des Iles Canaries, 
Foraminiféres, pl. 3. f. 5 and 6. 
