204 A DESCRIPTIVE CATALOGUE OF THE 
Long. 17 mm.; diam. 7 mm. 
Scalaria crenulata, Kien. Ieon. p. 17, t. 6, f. 18. 
Scalaria crenata, L., Sowb. Thes., p. 505, No. 88, fig. 123. 
Scalaria sp., Weinkauf, Mittelm., p. 241. 
Hab. St. Thomas (Riise); Porto Plata, St. Martin, Anguilla (Krebs); Jamaica 
(C. B. Adams); Arecibo (J. W. Newton). 
The described specimen is from Mr. Riise’s collection, the other being imperfect. 
This species is also much broader than the Mediterranean species S. crenata. 
37. ScaALA (OPALIA) HorTEsseRIANA, D’Orb. 
T. imperforata, turrita, subcylindrica, crassa, leviter flexa, alba vel interdum lilacina, subtilissime 
spiraliter striata; sutura foveolata sed non canaliculata; coste crass, convex, oblique 
xi-xii in anfr. ult.; costa basali crassa utrinque foveolata. Apertura orbicularis, peritremate 
crasso, antice producta. 
Long. 114 mm.; diam. 4 mm.; sed plerumque minor. 
Scalaria Hotesseriana, D’Orb., Cuba, p. 16, t. xi, f. 22-23. 
Scalaria crassicosta, Mus. Brit., Sowb. Thes. p. 104, No. 83, f. 119 (non Desh.) 
Rissoa crassicosta, C. B. Adams, Proc. Bost. Soc., Jan. 1845, p. 6. 
Scalaria grossicostata, Nyst., Tabl. 1873, p. 86, No. 136. 
Turbo coniferus, Mtg. Brit. Shells, p. 314? 
Hab. Guadeloupe (Hotessier); St. Martins (Swift); St. Thomas (Krebs, Riise). 
38. ScaLta (OpaALta) scHva, March, n. sp. 
T. imperforata, turrita, albescens, spiraliter et subtilissime confertissime, striata; anfr. convexi, 
obsoletissime confertissime striata; anfr. convexi, medio obsoletissime angulati, costs crasse 
conferte, versus suturam attenuate, in anfr. ult. cire. xv oblique plicze formes, umbilicum 
versus seepe evanescentes; spira varioribus 2; sutura crenulata. Apertura ovalis, peritremate 
crasso. 
Long. 13 mm.; diam. 44 mm. 
Var. a, costis obsoletis. Long. 12 mm.; diam. 4 mm. 
Hab, St. Thomas (Krebs, Riise). 
39. ScaLa (OpaALiaA) suBvaricosaA, Dkr. (MSS.), n. sp. 
T. turrita, subeylindrica, imperforata, lactea, subtilissime et confertissime spiraliter striata; anfr. 
medio angulati; costee obsolete, pone angulum furcate; anfr. ult. carinis 2, carina anteriore 
minore nodosa; sutura foveolata; fovee cire. 16 in anfr. ult. Apertura oyalis, peritrema 
marginatum. 
Long. 14 mm.; diam. 4 mm. 
Hab. St. Thomas, Anguilla (Krebs, Riise); Bahama (Riise). 
