PLATE XC. 
Concavum-zone. 
Figs. 1—3.—Sonninia papinionacea, S. Buckman. 
Fig. 1.—Side view of a specimen with part of the test preserved. Reduced to 
one-half natural size. Bradford Abbas. From my father’s Collection. (Page 
367.) 
Fig. 2.—Outline of part of the front view. Reduced one-half. 
Fig. 3.—Portions of two septa, showing the symmetrical superior lateral lobe 
with bipartite lateral lobules (papilioniform lobe). Natural size. 
Figs. 4—6.—Sonninia arrrita, S. Buckman. 
Fig. 4.—Side view of a specimen with nearly all the test preserved. Reduced 
to one-half natural size. Bradford Abbas. My Collection. (Page 371.) 
Fig. 5.—Outline of the front view. Reduced one-half. 
Fig. 6.—The suture-line, showing broad-stemmed, asymmetrical superior 
lateral lobe. Natural size. 
Figs. 7—9.—Sonninta patmata, S. Buckman. 
Fig. 7.—Side view of a specimen with part of the test preserved ; the body- 
chamber without test. Reduced to one-half natural size. From a bed about 
fifteen inches below the “ Fossil-bed”’ of Sandford Lane. My Collection. 
(Page 372.) (The inner whorls to umbilical diameter 20 mm. are badly 
preserved.) 
Fig. 8.—Outline of the front view. Reduced one-half. 
Fig. 9.—Part of the suture-line of the same fossil, showing the remarkable 
pentadactyloid, asymmetrical superior lateral lobe. Natural size. 
Fig. 10.—Sonninia optusirormis, S. Buckman. 
Fig. 10.—Part of the suture-line redrawn and lettered, for comparison with 
the suture-line of Sonn. palmata. (See Plate LXXII, figs. 3—5.) (Page 374.) 
