PLATE LXXXVI. 
Concavwm-zone. 
Figs. 1—3.—Sonninia mouricostata, S. Buckman. 
Fig. 1.—Side view of a nearly testate specimen, showing a few spines in the 
central whorls only. The Railway-cutting, Bradford Abbas. Formerly in the 
Collection of Mr. Darell Stephens, F.G.S. Now in my cabinet. (The reclination 
of the ribs on the third quarter of the penultimate whorl is incorrect. The 
ribs on the whorls make nearly a straight line towards the centre.) 
Fig. 2.—Outline of the front view. (The test is wanting on the ventral area 
of the aperture, but the carina would not be much bigger. The periphery at the 
bottom of the figure is hardly flattened enough.) 
Fig. 3.—Suture-line of the same specimen, showing asymmetrical superior 
lateral lobe, because of the unequal size of the lateral lobules. 
Figs. 4—6.—Sonninia spinea, S. Buckman. 
Fig. 4.—Side view. Nearly all the coste of the outer whorl are slightly 
knobbed. The specimen is wholly septate. Bradford Abbas. My Collection. 
Fig. 5.—Outline of the front view. (The test is present on the periphery of 
the penultimate whorl at the base of the truncate section; it is also present on the 
periphery of the first half of the ultimate whorl, but the bottom of the figure has 
been restored so far as the right-hand side is concerned. The test is absent from 
most of the truncate section, which is drawn as shown by the cast. If the test 
were present there would be a carina proportionate to that shown on the other 
parts of the whorl. In the lateral outlines the corrugations of the ribbing have 
not been shown.) 
Fig. 6.—Portions of two consecutive septa, showing a superior lateral lobe 
with an anisosceloid terminal lobule. 
