PLATE LXXXVIILI. 
Concavum-zone. 
Figs, 1—3.—Sownninia cippera, S. Buckman. 
Fig. 1.—Portions of two septa of an immature specimen—not the one figured 
in Pl. LXXXVII—taken at a radius of 61 mm., showing cruciform superior 
lateral lobes with intra-axial and anisosceloid terminal lobules, but with prac- 
tically equal-sized lateral lobules. 
Fig. 2.—The superior lateral lobe of a larger specimen taken at a radius 
of 81 mm., showing the same details. 
Fig. 3.—Portions of two septa from the same specimen at a radius of 101 mm., 
showing the same intra-axial, anisosceloid terminal lobule to the superior lateral 
lobe, but also showing pronounced abbreviation—amounting to abortion—of the 
inner lateral lobule, and this causes the lobe to be more asymmetrical on account 
of the unequal size of the lateral lobules, rendering the terminal lobule inequicellate. 
(These three figures illustrate the genesis of an asymmetrical, inequipoised 
lobe. ‘The inner lateral lobule is aborted on account of the approximation of the 
septa: it really touches the part of the preceding septum which bounds the 
superior lateral saddle.) 
Fig. +.—Sonninta, sp. 
Fig. 4.—Portions of two septa of the specimen depicted in Pl. LXXVII, 
figs. 6, 7, showing an inequipoised, asymmetrical superior lateral lobe, to compare 
with fig. 3. These septa are taken at a radius of 44 mm. 
Figs. 5—7.—Sonninia contusa, S. Buckman. 
Fig. 5.—Side view of a presumably adult specimen, reduced to one-half of 
natural size. The inner whorls are wanting, but on the others the test is present, 
and the deficiency of ornament is well shown. Bradford Abbas, Dorset. My 
Collection. 
Fig. 6.—Outline of the front view, showing the small size of the carina; test 
present. 
Fig. 7.—Part of the suture-line of the same specimen, showing the superior 
lateral lobe with inequipoised, short lateral lobules, the inner lobule being 
abbreviated; the terminal lobule is not quite axial, and is decidedly anisosceloid. 
A portion of the preceding septum is shown below the inner lateral lobule. 
Concavum-zone (presumably). 
Figs. 8—9 a.—Sonninia DensicostatTa, S. Buckman. 
Fig. 8.—Side view of a beautiful specimen with well-preserved test, showing 
numerous closely-set ribs; those of the last three-fourths of the outer whorl with 
small, very inconspicuous median knobs. ‘The figure is one-half the size of the 
original specimen, which belongs to the Museum of Practical Geology, Jermyn 
Street, London. It is labelled ‘“‘ Beaminster [Dorset], No. VIII/;5.”’ (Page 375.) 
Fie. 9.—Front view of the same specimen reduced to one-half natural size. 
(The ventral inclination of the ribs is not shown sufficiently, and the inner margin 
is not steep enough.) 
Fig. 9 a.—Outline section of the ventral area, showing the medianly-flattened 
periphery and the laterally-compressed carina. 
