PLATE LXXVIII. 
Concavum-zone. 
Figs. 1—5.—Sonninia sreticata, S. Buckman. 
Fig. 1.—Side view of the type-specimen, showing the peculiar arrangement of 
the ribbing—the “ biplication”’ and the “alternation.”’ The test is present, and 
the specimen is wholly septate. Bradford Abbas. From my father’s Collection. 
(In the front part of the fossil [bottom of plate] the carina is falsified by a layer 
of test, the remains of the formerly overlapping whorl. The specimen is drawn 
with this layer in situ.) (Page 245.) 
Fig. 2.—Outline of the whorl-section, with test. (The inclusion shown is 
insufficient. ‘he inner margin is not nearly sufficiently pronounced : its inner 
part is really very steep, though the outer edge is much rounded off. The carina 
of the embraced whorl has been falsified by lateral layers of test—remains of 
the inner part of the [formerly] overlapping whorl. This test, which had not 
become absorbed with that of the preceding whorl, is shown by the dotted lines ; 
and the carina is drawn as it would be if this test were removed.) 
Fig. 3.—Suture-line of the same specimen, showing a tetradactyloid superior 
lateral lobe. 
Fig. 4.—Side view of the specimen described in the text as Sonnima 
biplicata B. The specimen is nearly wholly septate. Bradford Abbas. My 
Collection. 
Fig. 5.—Front view of the same fossil. 
