SCALARIA.— Plate I. 



Species 4. (Miis. Nobis.) 



SCAI.ARIA PRETiosA. Sca. testd magiid, ventricosd, late 

 perforata, inter varices pallide fulvo-jmrpurascenti ; 

 anfractibus rapide cresccntibus, rotundis, separatis ; 

 varicibus distantibus, laminatis, prominente ex- 

 tantibus, vix crenulatis; aperturd marjnd, intiis 

 fusca; columella infrd rejlexd, incrassatd. 



The precious Scalaria. Shell large, ventricose, 

 broadly perforated, pale fulvous-piirple between 

 the varices ; whorls rapidly increasing, rounded, 

 separated ; varices distant, laminar, prominently 

 outstanding, scarcely crenulated ; aperture large, 

 brown within; columella reflected below, thickened. 



Lamarck. Anim. sans vert. 



Turho Scalaris, Linaseus. 



Hab. China. Australia. Molluccas. 



The above name being the one by which this beautiful 

 shell is popularly known, it is preferred to the old 

 specific name, now used generically. 



Species 5. (Mus. Brit.) 



Scalaria communis. Sca. testd elongatd, imperforatd, 

 purpurea fuscoque inter varices variegatd, super 

 varices radiatim maculatd, anfractibus numerosis, 

 lentissime crescentihus, coniiguis ; varicibus in- 



cequaUbus Jlexuosis, subextautibus, ad sutitram 



clevalis, junctis, continuis. 

 The common Scalaria. Shell elongated, imperforate, 



variegated between the varices, radiately spotted 



on the varices with purple and brown ; whorls 



numerous, very slowly increased, contiguous ; 



varices unequal, flexuous, rather extant, raised, 



joined, continuous. 

 Lamarck. Anim. sans vert. 

 Tm-bo clanthj-us, Gmel. 

 Hab. Great Britain. Scandinavia. Mediterranean. 



Species 6. (Mus. Brit.) 



Scalaria imperialis. Sca. testd late pyramidatd, per- 

 forata, ventricosd, tenuiusculd ; anfractibus paucis, 

 rapide crescentibus, inter varices purpureofuscis ; 

 varicibus numerosis, regidarihus, subrotundis ; 

 interstitiis angustis. 



The imperlal Scalaria. Shell broadly pyramidal, 

 perforated, ventricose, rather thin ; whorls few, 

 rapidly increasing, purple-brown between the 

 varices; varices numeroixs, regular, rather rounded; 

 interstices narrow. 



SowERBY. Proc. Zool. Soc, 1844. 



Hab. Mozambique. Swan River, Australia. 



The bright clear colour of the interstices between the 

 close white ribs, give a peculiar charm to this shell. 



