﻿PLATE LXXIII. 



Fig. 1. — Sonninia ptycta, 8. Buckman. 



Fig. 1. — Side view of an adult specimen with complete body-chamber. (The 

 drawing is a copy of a photograph reduced to about one-quarter the size of the 

 fossil, which is about 250 mm. in diameter.) Bradford Abbas, Dorset. My 

 Collection. (Page 3 32.) 



Figs. 2, 3. Sonninia cymatera, S. Buckman. 



Fig. 2. — Side view of a young specimen, showing small spines and 

 reclining ribs. Natural size. Bradford Abbas. Collected by Mr. Darell 

 Stephens, F.G.S., &c. Now in my cabinet. (Page 332.) 



Fig. 3. — Section of the whorl in outline, with test. (Ventral area not broad 

 and flat enough ; included whorl not broad enough.) 



Figs. 4 — 6. — Sonninia spinicostata, 8. Buckman. 



Fig. 4. — Side view of specimen with complete body-chamber. The body- 

 chamber is without test, but apparently its ribs would have been spinous if the 

 test had been present. 1 Bradford Abbas. From my father's Collection. (The 

 drawing is reduced to two-thirds the size of the fossil.) (Page 337.) 



Fig. 5. — Section of the whorl in outline, without test ; reduced two-thirds of 

 natural size. 



Fig. 6. — Suture-line of the same specimen of natural size. (Compare 

 PI. LVII, fig. 2.) 



1 The left side of this fossil should have been depicted, but, through some misunderstanding, the 

 artist has drawn the outer whorls of this specimen from the right side, while filling in the umbilicus 

 from the left. The umbilicus is correct, though reversed. The outer whorl, being without test, does 

 not show the persistence of the knobs up to the x as on the other side ; and the artist has failed to 

 indicate sufficient elevation (indications of knobs) for the middles of the ribs on the core of the last 

 half-whorl. 



