Stearns.] 24 [January 17, 
terior margin; interior of shell enamelled, with same color marks as 
externally ; number of specimens, twenty-five. 
Measurements of largest and smallest as follows: long., .93 inch, 
lat., .71 inch, alt.,.47 inch; long., .73 inch, lat., .54 imeh, alt)-ao 
inch. 
Habitat: Outer beach of Amelia Island, east coast of Florida, 
upon the timbers of an old wreck,! near low water mark ; numerous — 
specimens of this fine species were collected at the same time by my * 
friends Col. E. Jewett and Dr. William Stimpson. 
Carithidea turrita Stearns. 
Shellsmall, elongately conic, rather delicate, purplish white to dark 
purple, with whitish revolving band on the middle of the whorls, in- 
conspicuous except in the aperture; spire gradually tapering; whorls 
twelve, moderately convex, with sixteen to twenty prominent, smooth, 
equidistant, whitish longitudinal ribs, which terminate abruptly a lit- 
tle below the periphery of the last whorl, with a single narrow, revolv- 
ing keel below; suture deeply grooved; anterior portion of body- 
whorl smooth or marked only by incremental lines; aperture rounded 
above, subquadrate below; outer lip effuse, externally thickened; 
labium anteriorly prolonged, angulated; in some specimens the peris- 
~ tome is continuous. Number of specimens (adult) about one hun- 
dred, varying in measurement from lon. .51, lat. .16 inch to lon. .33, 
latey A ijnehse 
Habitat: Point Penallis, Tampa Bay, west coast of Florida, where 
I found it abundant beneath a confervoid growth in a shallow lagoon, 
associated with.Cyrena Floridana; also Mullet Key, Col. E. Jewett; 
Dr. Stimpson found specimens at other points on Tampa Bay. 
C. turrita is much smaller than Say’s species (C. scalariformis), 
which has a greater number of longitudinal and several revolving ribs; 
it is a more delicate and handsomer shell than C. ambdiguum C. B. 
Ad., from Jamaica, which it somewhat resembles; it is smaller than 
C. costata, of Da Costa, from New Providence in the Bahamas, which 
latter is more finely and closely ribbed. Ail of the above species pos- 
sess characteristics in common, which place them naturally in the 
same group, analagous to the West American group, of which C. 
Montagnei and C. pulchrum are representatives. 
1See “Rambles in Florida,’ in Am. Naturalist, vol. 111, p. 287. 
