PLATE VII. 1 



Murchisonce-zone. 

 Figs. 1 — 6. — Lioceras ambiguum, 8. Buchnan. 



Fig. 1. — Side view of a fine, well-preserved specimen, showing the small strias 

 and indications of ribs, as well as the sudden recession of the inner margin. 

 Bradford Abbas, Dorset. Collected by my father. (Page 26.) 



Fig. 2. — The same specimen, showing the front view. 



Fig. 3. — A portion of another specimen to show the side view of the termina- 

 tion. Bradford Abbas, Dorset. My Collection. (Page 27.) 



Fig. 4. — View (from above) of the termination of this specimen, showing the 

 rounded ventral process. [A very slight carina should have been indicated along 

 the middle.] 



Fig. 5. — Side view of a young specimen, possessing nearly the whole of the body- 

 chamber, and thus showing a large umbilicus. Bradford Abbas, Dorset. My 

 Collection. (Page 27.) 



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



Lioceras ambiguum, var. costatum, 8. Buchman. 



Fig. 7. — Side view of a fine specimen, with all its test preserved and part of the 

 termination of the body-chamber visible, showing numerous peculiar ribs which 

 characterise this variety, and a smaller umbilicus. Haselbury, Somerset. My 

 Collection. (Page 29.) 



1 In Plates VII and onwards all the specimens are figured of the natural size unless otherwise stated. 



