136 ROTELLA. 



4. GiGANTEA, f. 15, 16, Lesson. -Magna crassa couica, 

 griseo late ftisciata, angulatim nigro-raaculata callo crasso 

 rubro-purpureo ; columella crassissima, apertura breviuscula ; 

 anfractibiis superne lateraliter planatis. — This large species 

 comes nearer in shape to R. elegans than any other. Besides 

 its size, it is remarkable for its very thick columella and its 

 broad purple red-tinted callus. 



5. CONICA, f. \0, Adams. — Parva fusco-purpurea nigrescens 

 nitens ; superne conica alta ; infra subplanata callo umbili- 

 cali parvo. — Small, darkly-coloured, and conical, with a small 

 callus. The apex is light purplish brown, with a fire-like 

 iridescence seen through the outer surface. 



6. INFRAPLANATA, f. 11, 12, 13, Soivevhy. — Subviride fusca, 

 concentrice fusco nigrescenti irregulariter lineata, elevatim 

 conica anfractibus planatis, subtus planata callo parvo, inter 

 callum et marginem griseo fasciata; angulo subacuto. — The 

 upper part is a straight- sided cone; the lower is a flat, 

 almost concave disc, with the angle rather sharp. 



7. ZELANDiCA, f. 24, A. AdaTTis. — Pallide fulva, rubro- 

 purpurascenti, lineatim strigata ; anfractibus infra suturam 

 depressis, ad angulum biliratis ; subtus tenuissime striatis 

 columella crassa; callo umbilicali parvo, griseo-purpurascenti. 

 — There is a depression under the suture towards the middle 

 of the upper surface of the whorls, and a sort of flattened 

 keel formed of two conspicuous ridges on the angle. The 

 under surface is very finely spirally striated. 



8. cosTATA, f, 21, 22, 25, Valenciennes. — Depresso-conica 

 grisea vel fusca, rubro vel nigro tessellata ; radiatim sulcis 

 senis sculpta, costis inter sulcis vix elevatis planatis ; callo 

 umbilicali subplanato plerumque purpureo-rubescenti; colu- 

 mella crassa. Var. f. 21, monilifera, Lamk., costa suturali 

 monilifera. Var. f. 22, sntiiralis, Lamarck, costa suturali 

 supra suturam elevata; sutura profunda. — The sculpture of 

 this species consists of flattened spiral ribs separated by 

 narrow grooves. In the variety named monilifera the rib 

 next to the suture is beaded. In that named suturalis, it is 

 merely swollen, and makes the suture appear deep. In a 

 number of specimens the varieties will be found to pass into 

 each other. 



9. JAVANICA, f. 23, Lamarck. — Alta conica tenuiuscula; 

 supra angulum cserulea, spiraliter subdistanter sulcata, ad 



