318 BULLETIN OF THE 



This pretty species is very near S. centiquadra, but is more turLiniform, has 

 a looser coil and a perceptible umbilicus, and is distinctly striated only in a 

 spiral direction. 



Scala Krebsii Morch. 



Scala Krebsii Morch, Malak. Bliitt., XXIL p. 142, 1875 ; Journ. Acad. Nat. Sci. Pliila., 

 new ser., VIll. p. VJ2, pi. xxix. figs. 1, 2, 187G. 



Habitat. St. Martin and St. Thomas, in 60 fms., mud, Krebs; off Sombre- 

 ros, in 54 fnis., Blake Expedition. 



The single specimen obtained is rather young. 



Scala contorquata n. s. 



Plate XVIII. Fig. 9. 



Shell small, short, broad, acute, umbilicate, with rotund whorls loosely coiled, 

 the later ones only joined by the fused varices; pure white, nucleus of four 

 and a half translucent, flattened, smooth, shining whorls; the first extremely 

 minute, the whole (in the type) set on obliquely to the axis of the adult, which 

 has four and a half whorls, apparently smooth between the varices, but with ex- 

 tremely fine sharp spiral striae scattered here and there sparsely: aperture very 

 Blightly longer than wide, rounded; peristome slightly cancellately rugose on 

 its anterior face ; varices on the last whorl twelve, attached to the front edges of 

 those on the next above, thin, sharp, not wide, edge (when not chipped) simple, 

 slightly produced behind near the sutures; base without rib or carina, with a 

 narrow but deep umbilicus, around which the edges of the varices are not fused 

 W'ith one another. Lon. of shell, 4.7; of last whorl, 3.2; lat. 3.5; max. diam. 

 of aperture, 1.6 mm. 



Habitat. Station 248, off Grenada, in 161 fms., fine gray ooze, bottom tem- 

 perature 53°.5. 



This shell is shorter and more pointed than any of the species described in 

 Morch's ]\Ionograph of West Indian Scalidce. Its nearest described relative is 

 S. Swiftii Morch, which is much more elongate, with the peristome anteriorly 

 effuse, an almost closed axis, broader varices, and a shorter, stouter, and larger 

 nucleus. A large series might indicate a relation closer than can be assumed 

 from the few specimens in hand. 



Scala uncinaticosta Orbigny. 



Scalaria uncinaficosfa Orb., Moll. CubA, p. 10, IT. pi. xi. figs. 25-27, 1842. 

 Scala uncinaticosta Morch, Cat. W. I. Scalidce, Journ. Acad. Nat. Sci. Pliila , 2d ser , 

 VIII. p. 201, 1876. 



Habitat. St. Thomas, Krebs; Guadelupe, Cande; Barbados, in 100 fms., 

 Hassler Expedition. 



This little species is like a diminutive S. turrlcida, with proportionally strong 

 varices and finer spiral lira. 



