SONNINIA B1PLICATA. 417 



Sonninia revirescens, 8. Buchman. Plate C, fig. 9. 

 See Plate LXX, fig. 1, and page 324. 



Add to the description : — The costas which follow the spinous stage are 

 grouped somewhat irregularly and obscurely in pairs. Septa with fairly long lobes, 

 L with terminal lobule intra-axial, anisosceloid, inequicellate ; lateral lobules not 

 very anisometric, not opposite. 



S. Outer lateral lobule of L strongly bipartite. 



Fig. 46. — Outline of L of Sonn. biplicata. 



Sonninia irregularis, 8. Buchman. Plate XCVIII, fig. 6. 

 See Plate LXI, and page 320. 



To the description add : — Suture-line with somewhat asymmetrical L, the 

 terminal lobule intra-axial, anisosceloid, inequicellate ; the lateral lobules aniso- 

 metric, the outer the larger and bipartite. 



A fine specimen has been figured in PI. LXI, and this is the type of the species. 

 It will be advisable not to trust the part of the description referring to forms 

 supposed to be its varieties. It is only too probable, from what has been shown 

 in other cases, that this supposition may not be supported by the septation. 



Sonninia biplioata, 8. Buchman. Plate CIII, fig. 16. 

 See Plate LXXVIII, and page 345. 



The type of this species is the specimen depicted in PL LXXVIII, figs. 1 — 3. 

 The example described as Sonn. biplicata /3 differs in ornamentation ; and its 

 suture-line, which has now been obtained (PI. CIII, fig. 16), differs in lacking the 

 strong bipartition of the outer lateral lobule of L. It is doubtful whether under 

 these circumstances it can remain in the present species. 



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