MOLLUSCAN FAUNA FROM DELAND- 
12 1 
about a half turn around the axis ; terminal varix heavier, roughened 
by a few parallel striae and overlaps by a callous thickening the basal 
ends of five other varices beneath the lower axial margin of the 
aperture; spiral sculpture over about three-fourths of the anterior 
surface of the whorl consists of about ten slightly raised, rounded, 
equally spaced, moderately broad bands separated by narrow im- 
pressed lines, giving a pleated appearance to the shell. 
The Type (Cat. No. 168212, U. S. N. M.) measures, length 
13.2 mm, maximum diameter 5 mm. 
This species is closely related to Epitonium turricula Say, but 
differs from this chiefly in having a coarser banded spiral sculpture. 
Epitonium groenlandicum Chemnitz has a much heavier and 
coarser sculpture, both spiral and axial. 
Type locality — Upper marl bed about one mile south of DeLand. 
Volusia County, Florida. Dr. E. H. Sellards, collector. 
GEMMA TRIGONA DALL, NEW SUBSPECIES DELANDENSIS. 
Fig. 9, Nos. 2-3. 
The size, of this form and the strength of the cardinal teeth are 
like the type of the species, Gemma trigona Dali ; but it differs from 
the latter in having a rounder basal margin and a well defined con- 
centric surface sculpture. 
It is smaller than Gemma magna Dali, more equilateral, has 
larger and stronger cardinal teeth, and coarser concentric surface 
sculpture. 
The type (Cat. No. 168211 U. S. N. M.) measures: right valve, 
length 4 mm. ; height 3.7 mm. ; diameter (double) 2.2 mm. 
Type locality — Upper marl bed about one mfie south of DeLand, 
Volusia County, Florida. Dr. E. H. Sellards, collector. 
At localities mile north and south of Orange. City, Fla., there 
are forms with nearly smooth surface sculpture, but otherwise sim- 
ilar to those at DeLand ; these, I believe, represent only local varia- 
tions of the same subspecies. 
PHACOIDES (BELLUCINA) WACCAMAWENSIS DALL, NEW SUB- 
SPECIES DELANDENIS MANSFIELD. 
Fig. 9, No. 4. 
This is a larger form- with more radial ribs than type, averaging 
about twelve. The anterior dorsal area is rougher, being marked 
