PLATE XII. 



Sowerbyi-zone (Concavum-beds). 

 Figs. 1 — 3. — Lioobeas CONCAVUM, var. pingue, 8. Buckm,an. 



Fig. 1. — Side view of a specimen with part of the termination to the body- 

 chamber. The test is well preserved. Halfway House, near Sherborne, Dorset. 

 My Collection. 



Fig. 2. — Front view of the same specimen. 



Fig. 3. — A sectional view of the hollow umbilicus of the same specimen (to 

 compare with Fig. 7). 



Murchisonce-zone. 

 Figs. 4 — 7. — Liooeras beadfoedense, var. giganteum, S. Buckman. 



Fig. 4. — Front view of the specimen drawn on Plate XI, fig. 1. The test 

 covers the whole of the ventral area shown, and is also seen at the top of the 

 figure. Natural size. (Page 25.) 



Fig. 5. — Side view of a young specimen with all its test well preserved. 

 Stoke Knap, near Broad Windsor, Dorset. My Collection. (Page 25.) 



Fig. 6. — Front view of the same specimen. 



Fig. 7. — Sectional view of the umbilicus of the same specimen, showing the 

 edges of the inner whorls (to compare with Fig. 3). 



Sowerbyi-zone (Concavum-beds). 

 Figs. 8, 9. — Lioceeas decipiens, 8. Buckman. 



Fig. 8. — Side view of a large specimen showing very smooth test, which is well 

 preserved, and part of the termination of the body-chamber. (The shell on 

 the body-chamber has been drawn from what exists on the other side.) The cross 

 shows the situation of the last suture-line. From near Sherborne, Dorset. Col- 

 lected by my father. (Page 30.) 



Fig. 9. — Front view of the same specimen, showing flat ventral area and small 

 but distinct carina. 



Liooeras decipiens, var. inteemedium ? 



Fig. 10. — Side view of a doubtful form, with more prominent inner costse (to 

 compare with Lioceras decipiens, Lioc. intermedium, and Ryperlioeeras Walkeri). 

 (Page 34.) 



