DR, W. B. CARPENTER ON ORBITOLITES TENUISSIMA. 
573 
closed-in by a peneropline septum traversed by four passages ; h, second 
chamber, divided by radial partition into orbiculine chamberlets ; c, third 
chamber, not here separated from the second by a septum, and having only 
one radial partition ; cl, cl, fourth chamber, having at cl', cV, lateral extensions 
which begin to enclose the spiroloculine coil; e, e, fifth chamber, with 
lateral extensions, e, e, proceeding still further backwards; these chambers, 
and those that succeed them, divided by radial partitions into orbiculine 
chamberlets. Magnified 75 diameters. 
MDCCCLXXXII1. 
4 e 
