PLATE LXXXVII. 
Concavum-zone. 
Figs. 1—3.—Sonwinia scaupra, S. Buckman. 
Fig. 1.—Side view of a beautifully-preserved specimen, showing spinous 
stages interrupted by a short costate stage on the latter half of the antepenultimate 
whorl. Formerly in the Collection of Mr. Darell Stephens, F.G.S. Now in my 
cabinet. (Page 376.) 
Fig. 2.—Front view of the same specimen. 
Fig. 3.—Portions of two septa from the same specimen, the one to supplement 
the other. The lower superior lateral lobe is the best preserved and most trust- 
worthy. 
Figs. 4—5.—Sonninia GIBBERA, S. Buckman. 
Fig. 4.—Side view of an immature shell with the test preserved. (The central 
part of the umbilicus is somewhat damaged, but there is indication of a regular 
strongly-spinous stage.) Bradford Abbas. My Collection. 
Fig. 5.—Outline of the front view of the same specimen reduced to two-thirds 
natural size. 
(For septa of this species see next plate.) 
