MUSEUM OF COMPARATIVE ZOOLOGY. 93 



Natica leptalea Watson. 



N. leptalea Wiitson, Journ. Liim. Soc. (Zool. ), XV. p. 261. Dec. 1880. 



A small specimen, perhaps the young of the above species, was dredyed in 

 640 fathoms in Yucatan Strait. Watson's specimens were from near Sombrero 

 Island, W. I., in 450 fathoms. 



Natica fringilla n. s. 



Shell small, elevated, slightly turreted, blunt-tipped, wavy white, of three 

 or four whorls ; nucleus translucent, polished, rather disproportionately large, 

 depressed nearly to the level of the next whorl, and so giving the spire a blunted 

 aspect ; transverse sculpture of strong plicatioiis like the " gathers " of a 

 skirt, about thirty-two on the last whorl, not pei'fectly uniform in elevation or 

 extent, passing forward from immediately in front of the suture a distance of 

 about 1.25 mm., and then becoming obsolete or replaced by ordinary lines of 

 growth ; these plications are sharp-edged near the suture with about ei^ual 

 interspaces, and gradvially grow wider, flatter, and less elevated anteriorly 

 until tliey disappear ; surface polished, lines of growth not prominent ; spiral 

 sculpture none, though the surface is marked with those faint revolving mark- 

 ings, visible only by reflected light, which are common to nearly all spiral pol- 

 ished shells, and, as far as I have observed, to all species of this genus ; suture 

 well marked, slightly appressed ; whorls rounded behind and laterally in 

 female, and slightly laterally flattened in male specimens ; base prettily 

 rounded ; umbilicus small, funiculate at its mouth, twisted, with a rounded 

 not very distinctly defined riblet coiled on its inner surface, beginning from the 

 anterior end of the pillar lip ; no umbilical pad ; outer lip simple, sharp- 

 edged, a little oblique, and, at maturity, slightly bent downward and forward 

 at its junction with the body whorl ; pillar-lip and body moderately thick- 

 ened, an emargination in front of and corresponding to the umbilical arch ; 

 aperture rounded in front, pointed behind. liOn. of shell, J 7.0, 9 5.75 ; of 

 aperture, ^4.0, 94.0. Ma.x. lat. of shell, ^.5.0, 9 5.0 ; of aperture, J 2.5, 

 9 2.5 mm., the 9 being a somewhat younger shell 



Yucatan Strait, 640 fms. Off Cape San Antonio, 640 fms. 



Among all the descriptions of forms from deep water, I have found none 

 which apply to this rather simple little species, which is about the size of 

 N. imsilla Say, but (|uite distinct from it. In his report on the French expedi- 

 tion of the Travailleur in the Bay of Biscay, Dr. Jeflfreys mentions as new, 

 but does not describe, a N. subplicata, which, from the name, might be allied 

 to this. 



Turritella Yucatecanum n. s. 



Shell small, thin, acute, opaque white mottled with rusty brown, of about 

 twelve whorls ; nucleus and second turn minute, white, smooth, with deep 



