PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 333 
«laret brown, the last whorl being the darkest; riblets fainter, less pro- 
dluced) anteriorly, last whorl with hardly any ribs; spiral seulpture 
finer and closer and lines much more numerous than in that species; 
they are also uncolored; the whorls are more rounded and there are 
about eighteen instead of twenty-five ribs, which do not reach so far 
forward. Max. lat. of shell, 1.67; lon. of shell, 8.0; of last whorl, 1.75™™. 
Habitat.—Cedar Keys; with the last. This species at first sight ap- 
pears extremely distinct from viridaria, but a careful examination with a 
lens shows that the differences are chiefly in color and strength of 
sculpture. However, it seems well entitled to a varietal name, and may 
on further examination prove to be distinct. 
These Turbonillas are a very puzzling group, with few good charac- 
ters for diagnosis, but the above appear distinct from any ascribed to 
the West Indies or the eastern coast of the United States. 
Scalaria angulata Say. 
Sarasota Bay, on the sand between tides, not common. 
Scalaria lineata Say. 
Cedar Keys, on the mud flats, rare. 
Cerithium ferrugineum Say. 
Sarasota Bay and Key West, abundant on the mud flats between 
tides. 
Cerithium muscarum Say. 
Sarasota Bay, mud flats between tides, abundant. This is one of the 
most lovely shells of the genus. 
Cerithium septemstriatum Say. 
Key West, between tides, common. 
Cerithium nigrescens Menke. 
Sarasota Bay, between tides. One of the most abundant shells of the 
region. 
Cerithium thomasiz Sby. 
Key West, on the mud flats, scarce. A common Antillean species. 
Cerithiopsis terebralis A@fams. 
Key West, on the reefs at low water, abundant; Tampa, abundant on 
the oysters; Cedar Keys, on the “coon oysters” and on the mud flats, 
abundant. Also over the whole eastern coast of the United States. 
Cerithiopsis emersonii C. B. Adams. 
Cedar Keys, very large and fine. 
‘Cerithiopsis tuberculata Mont. 
Key West, reefs at low water, not very common. 
Triforis nigrocinctus Adams. 
Cedar Keys, on “coon oysters,” rare; Key West, reefs at low water, 
rare. The metropolis of this species is farther north. 
