332 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
margins and pillar, on which last is an obsolete, or extremely faint, 
plait-like callosity or twist; no umbilicus; operculum translucent, ex- 
tremely thin, subspiral, horny. Lon. of shell, 5.5; of last whorl, 2.25; 
of aperture, 1.50; max. lat. of shell, 1.50™™. 
> 
Habitat.—Cedar Keys, on mud flats; very rare. Iam not sure that — 
Iam right in referring this species to Parthenia. It appears like a 
white reticulately sculptured Turbonilla, with a faint plait. 
Turbonilla viridaria n. s. 
Shell slender, yellowish waxen, with red-brown spiral lines and base; 
sixteen whorls, with about (on the last whorl) twenty-five transverse 
riblets; base scored with fine spiral grooves, otherwise smooth; aper- 
ture squarish, rounded in front ; nucleus smooth, sinistral, blunt; trans- 
verse ribs extending from suture to suture, slightly oblique, nearly 
continuous along the spire, the line from base to nucleus making about 
half a volution, in a posterior sense; whorls flattened, making the out- 
line of the spine nearly a true conic section; suture distinct; riblets 
rounded, smooth, subequal frem end to end; spiral grooves appear 
sharply and distinctly cut, running (apparently) under the ribs, with 
red or brown color in the grooves, as if rubbed in; there are three or 
four from the suture forward, then a distinctly wider interspace, then 
two more to the suture, or about five to the ends of the ribs on the last 
whorl, which little more than pass the periphery; base smooth, red- 
brown, with distinct spiral grooves, more crowded toward the axis; 
whole shell neatly polished, with a tendency to weather ashy or white. 
Lon. of shell, 11.0; of last whorl, 2.25; max. lat. of shell, 2.25™™, 
Habitat.—Cedar Keys, among the sea grass on the mud flats; notrare. 
This is nearest 7. rathbunit Verrill, which has twelve whorls to a 
length of 13.0 and a width of 4.0™™. 
Turbonilla (viridaria var.?) virgan.s.? 
Shell resembling the last, but slenderer and more drawn out, much 
smaller, with a larger and narrower aperture, and with more regular 
spiral grooves, which are not colored, and fewer ribs. Whorls seven, 
with about fifteen transverse ribs, larger and carried farther over the 
periphery than in the preceding species; a tinge of claret color on the 
pillar, elsewhere greenish, translucent. Lat. of shell, 1.0; lon. of shell, 
3.1; of last whorl, 1.5™™. 
Habitat.—Cedar Keys with the last species. This was sent by Mr. 
Hemphill as the young of the preceding, but differs from specimens of 
its own size in having one whorl less in the same length and in having 
the grooves without color and evenly distributed, and in other features 
as above. It is probably distinct, but I prefer to leave it as a variety 
for the present. 
~ 
Turbonilla (viridaria var.?) punicea n.s.? 
Shell resembling viridaria but smaller, with thirteen whorls; color whit- 
ish at the tip, gradually becoming more and more tinted with a clear 
sd 
