PLATE XVIII. 



Concavum-beds. 

 Htperlioceeas discites {Waagen). 



Fig. 1. — Fine adult specimen. The test is excellently preserved. The lower 

 part of the figure shows longitudinal lines — the indications of the further over- 

 lapping of the whorl. Half a whorl from the last piece of inner margin must be 

 added to imagine this specimen complete. No portion of the body-chamber is 

 present. Bradford Abbas (Anbury Quarry). My Collection. Obtained by Mr. 

 F. Stubbington. (Page 94.) 



Fig. 2. — Front view of the same specimen. (The section of the aperture is 

 taken from the top point of whorl to centre, leaving the projecting piece out.) 



Fig. 3. — Front view (in outline) of the specimen figured Plate XVII, fig. 5 

 (var. I). 



Fig. 4. — Side view of a young specimen (var. I). Bradford Abbas, Dorset. 

 My Collection. 



Fig. 5. — Front view of the same (in outline). Only the top of the aperture has 

 the test present on the carina. 



