198 A DESCRIPTIVE CATALOGUE OF THE 
I refer to this species with some doubt, a worn specimen. 
Scalaria georgettina, Kiener, is nearly allied. 
20. SCALA GRADATELLA, Morch, n. sp., Pl. 29, fig. 11. 
T. imperforata, gracillima, lactea, polita; costa candide, oblique, superne ad suturam angulifere 
vel obsolete aurite, in anfr. ult. xi; sutura canaliculata, constricta. Apertura ovalis. 
Long. 115 mm.; diam. 3 mm. 
Hab. St. Thomas; specimen unicum (H. Krebs). 
Scala gradata, Sowb., is very like in shape, but much larger. 
Sect. ****, Turbona, Browne. 
21. SCALA UNIFASCIATA, Sowb., Pl. 29, fig. 13. 
T. turrita, imperforata, solida, nitida, alba, fascia ferruginea suturali, huc illuc striis spiralibus 
subtilissimis ; anfr. convexiusculi, sutura simplice; coste vii in anfr. ult., continue, ambu- 
lacra vix torta. Apertura circularis labio incrassato antice subcrenulato, angulaproducto. 
Long. 10 mm.; diam. 4 mm. 
Scalaria unifasciata, Sowb., Thes. p 98, t. 33, f. 68. 
Hab, Anguilla, St. Vincent (Riise, Krebs, Swift, Ravn.); St. Croix (Oersted) ; 
St. Martins (Krebs); St. Jan. (Riise); Guadaloupe (Swift). 
22. ScaLA UNDEcIMCosTATA, Mirch, n. sp. 
T. imperforata, abbreviato-turrita, solidissima, lactea vel isabellina, subtilissime et confertissime 
spiraliter striata; anfr. convexi, sutura profunda; costs candids, crass, triquetrae, regu- 
lares, eequales circ. xi in anfr. ult., ad suturam expanse, antrorsum adnate; ambulacra 
obliqua vix torta. Apertura oyalis pariete aperturali obtecto, labro crasso antice angulato. 
Long. 10} mm.; diam. 44 mm. 
Hab. St. Thomas (Krebs, Riise); Jamaica (Verkr.). 
Allied to Scala monocycla, Lam. 
23, ScALA octocostaTa, Mérch, n. sp. 
T. gracilis, alba, polita, striis spiralibus subtilis simis sub lente vix detegendis; anfr. convexi- 
usculi, sutura impressa; costee viii in anfr. ult. simplices, continua, humiles, ambulacra torta 
sigmoidea. Apertura obovata, pariete vix tecto, labio antice incrassato subeffuso. 
Long. 8 mm.; diam. 3 mm. 
Hab. St. Thomas; spm. unicum (H. Krebs). 
Scala Elenensis, Sowb., is the nearest allied. 
