o 



22 BULLETIN OF THE 



Scala hellenica var. Morchiana Dall. 



Plate XVIII. Fig. 1. 



Shell small, slender, acute, solid, finely reticulate, imperforate, with seven 

 and a half normal and three and a half thin, translucent, smooth, shining, nu- 

 clear whorls; spiral sculpture of twelve to fifteen flattened crowded threads, 

 a broader one marginating the anterior edge of the suture to which it is closely 

 appressed; these cross (on the last whorl 9-10) rather angular transverse ribs, 

 which on the last whorl are a little elbowed on the periphery, but in general 

 are pretty even, becoming obsolete toward the sutures. The spiral threads are 

 crossed by a multitude of extremely fine, rather even sharply defined lira?, 

 which extend from suture to suture, neatly reticulating the spiral sculpture, 

 and giving to the extremely narrow interspaces a punctate aspect; there are 

 very few varices on the shell ; in the type the last whorl begins and ends with 

 one; the aperture is nearly circular, with a groove around its inner margin, 

 outside of which is the cancellated anterior face of the very thick varix, which 

 is somewhat excavated behind; base rounded without carina or special sculp- 

 ture. Lon. of shell, 6.87; of last whorl, 2.5; of aperture, 1.25; max. lat. of 

 last whorl, 2.0 mm. 



Habitat. Barbados, 100 fms. 



j > 



Scala (Dentiscala) aurifila n. s. 



Plate XVIII. Fig. 4. 



Shell slender, solid, white, evenly tapered, with about thirteen moderately 

 rounded, rather strongly sculptured whorls. Nucleus ? (missing in the type) ; 

 longitudinal sculpture consisting, first, of five or six uniform strong rounded 

 threads having a light yellowish color, which, when the shell is fresh, contrasts 

 distinctly with the opaque whiteness of the rest of the surface; these threads 

 pass over the transverse sculpture without Modulation, and are at a nearly 

 uniform distance from each other, but the space between the posterior thread 

 and the suture behind it is nearly twice as wide as the others; the remaining 

 spiral sculpture is composed of very much finer, even, uniform rounded threads, 

 four to six between each two large ones, and (on the last whorl) ten or eleven 

 between the posterior strong thread and the suture; these are on the later 

 whorls reticulated by similar but transverse threads, which pass over the whole 

 sculpture from suture to suture, but which are obsolete or absent on the 

 smaller whorls; in addition to these there are on each whorl about twelve 

 strong rounded costse or elevated waves, extending backward from the pe- 

 riphery of the base to the suture, which is coronated by their stout rounded 

 terminations with the appearance of pits between them; these ribs have a 

 slightly fiexuous outline, and upon nearly every whorl there is one or more of 

 them stouter, more elevated, and more oblique than the others, having the 

 character of a varix; the base is rounded, the basal area is small, margined by 



