PLATE LXXXIX. 
Concavum-zone. 
Figs. 1—5.—Sonninia nopata, S. Buckman. 
Fig. 1.—Side view of a specimen with most of its test preserved. Bradford 
Abbas. From my father’s Collection. (Page 369.) 
Fig. 2.—Outline of the front view. The outer edge of the inner margin is too 
angular. 
Fig. 3.—Parts of two septa of the same specimen, showing superior lateral lobe 
with intra-axial, anisosceloid terminal lobule. 
Fig. 4.—Side view of a young form closely agreeing with the inner whorls of 
the large specimen, but a degree less spinous. 
Fig. 5.—Front view of the same specimen. 
Figs. 6—8.—Sonninia REFoRMATA, S. Buckman. 
Fig. 6.—Side view of a specimen with test partly preserved, showing spinous 
stages parted by a costate stage. Bradford Abbas. My Collection. 
Fig. 7.—Front view of the same shell. The test is absent from nearly all of 
the periphery, and the carina is broken away, only the partition-band remaining 
in places to show that there was a hollow carina. The core is distinctly carinate- 
bisulcate. 
Fig. 8.—Part of the suture-line taken at a radius of 36 mm., showing long 
and rather elaborate lobes for so small a shell; the superior lateral lobe almost 
cruciform and symmetrical, the terminal lobule slightly intra-axial and anisosceloid. 
(The constriction in the middle of the stem of the lobe is exaggerated.) 
Figs. 9, 10.—Sonninia, sp. 
Fig. 9.—Side view of a small specimen, showing the very early age at which 
the spinous yields to the costate stage. ‘This is possibly the young form of 
Sonn. simplex (Pl. LXX, page 326), or of its morphological equivalent. It has 
nothing in common with S. reformata, though the plate suggests a false similarity ; 
but the ornament in this form is very decidedly less. 
Fig. 10.—Front view. 
