SONNINIA DOMINANS. 435 



a terminal lobule anisosceloid and intra-axial, the lateral lobules nearly isometric 

 but not opposite. 



The young specimen figured, which is different from anything else in my cabinet, 

 shows in its inner whorls two spiuoiis stages parted by a short costate stage. 

 This feature it shares with Sonn. scalpta, from which its septation and its different 

 proportions separate it. The septation shows it to be one of the long-lobed series, 

 and the want of bipartition of the outer lobule of L that it is allied to 8. renovata. 

 That species, however, does not show two spinous stages parted by a costate stage 

 until late in life ; it has a more strongly spinous centre and more gibbous-sided 

 whorls. 



Sonn. reformata occurs in the Concavum-zone of Bradford Abbas. The figured 

 specimen, which is unique, was obtained by myself from the railway-cutting. It is 

 illustrated in PI. LXXXIX : side view, fig. 6 ; front view, fig. 7 ; suture-line, fig. 8. 



j3. Outer lobule of L strongly bipartite. 



Fig. 55. — Outline of L of Sonn. dominans. 



Sonninia dominans, 8. Buchnan. Plates XCIV, figs. 1, 2 ; XCV, fig. 1 ; XCVII, 



fig. 4. 

 See PI. LXVI (only) and pages 322—324 (pars). 



Add to the description : — Ribs of the inner whorls of the type slightly irregular 

 in size, and obscurely connate on the inner third of the whorl. Erase description of 

 suture-line, and substitute : — Lobes of the type-form long ; L with an inequicellate, 

 anisosceloid, ecto-brachysceles terminal lobule, the lateral lobules not opposite, 

 the outer being further back than the inner. 



The above is the description of the outline of the last septum of the type- 

 specimen shown in PI. LXVI— the outline itself PI. XCVII, fig. 4 ; but, although 

 considerable trouble has been taken, the septal margin could not be cleared to 



