135 



EOTELLA, Lamarch. 



Plate 472. 



Testa depresso-conica solida ; infra angulum callo umbili- 

 cali incrassata ; intus nacrea ; apertura subtrigona ; operculo 

 corneo. — Trochiforra, but depressed ; pearly within, and 

 liaving the region of the umbilicus thickened by a lens- 

 sliaped callus. 



Species. 



1. VESTiARiA, f. 1 — 5, 19, 20, Linnceus {Trochm). — Supra 

 infraque fere opqualiter convexa, fasciis strigis et maculis 

 varie picta ; angulo anfractuum obtuso ; callo umbilicali len- 

 ticular! ; anfractibuR superne convexiusculis. — P^xcluding tlie 

 next species, the average R. vestiaria may be described as 

 nearly equal in convexity above and below the angle, the 

 upper being slightly more conical, the lower more lens- 

 shaped. R. dejjressa of A. Adams (f. 19, 20), although a 

 little more depressed than most of the varieties, can scarcely 

 claim distinction. 



2. ELEGANS, f. 6, 7, 8, Beck. — Quam R. vestiaria magis 

 conica, anfractibus magis planatis. — More stiaight-sided and 

 conical than sp. 1. Generally larger, and bolder in pattern. 

 A tiayful of both species mixed can be sorted without much 

 difficulty. 



3. CALLOSA, f. 26, Soiuerby. — Grisea minute nigro fuscoque 

 variegata ; ultimo anfractu lato, superne convexo, infra callo 

 ventricoso incrassato. — The last whorl is wide and convex 

 above, rounded at the outer margin, and thickened on the 

 under side by a swollen callus. 



