SlcaniM ' '24: [Jaiiuary 17, 



ti'i'ior inaririn ; interior of shell enauielled. with saint- 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., .7.3 inch, lat., ..j4 ini-h. alt., .3.'') 

 inch. 



Hal)itat: Outer beach of Amelia Islaml, east coast of Florida, 

 iipnn the timljers of an ohl wreck, ^ near low water ni;irk ; numerous 

 specimens of this fine species were collected at the same time by my 

 friemls Col. K. Jewett and Dr. William StimpsoTi. 



CJ^rithidea turrita Stearns. 



Sjicll siiiall. elongately conic, rather delicate, jjurjilish 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, 

 eijuidistant. whitish longitudinal ribs, which terminate abruptly a lit- 

 tle below the periphery of the last wliorl, with a single narrow, revolv- 

 ing keel below; suture deeply grooved; anterior jiortion of body- 

 whorl smooth or marked only by incremental lines; aperture rounded 

 above, subcjuadrate below; outer lip effuse, externally thickened; 

 labium anteriorly prolonged, angulated; in some specimens the; peris- 

 tome is continuous. Nmuber of specimens (adult) about one hun- 

 dred, varying in measurement from Ion. .r>l. lat. .If! inch to Ion. .33. 

 lat. .11 inch. 



Ilaliitat: Point Penallis, Tampa Bay, west coast of Floi-ida, where 

 1 tbunil it abundant beneath a confervoid growth in a shallow lagoon, 

 associated with Cyrena Floridana; also Mullet Key. Col. E. Jewett; 

 Dr. Srimpson found specimens at other points on Tampa Bay. 



('. lurrif'i is much smaller than Say's species (C. scalari/orntis), 

 which has a greater number of longitudinal and several revolving ribs; 

 it is a more delicate and handsomer shell than C. amhigunm C. B. 

 Ad., from Jamaica, which it somewhat resembles; it is smaller than 

 C. cnsta/a, of Da Costa, from New Providence in the Bahamas, which 

 latter is more finely and closely ribbed. All of the above species pos- 

 sess characteristics in connnon, which place them naturally in the 

 same group, analagous to the West American group, of which C. 

 Mmitdi^iifi Mild C. pulrhruiiiiWit representatives. 



'See ••Haiiibles iu Florida," in Am. Naturalist, vol. in, p. 287. 



