Siphonaria naufragum, Stearns, f, •I'h 



Shell oval, depressed conic, with numerous fine radiating ribs of a whitish 

 color, the interspaces of a reddish or chocolate brown ; also marked by many 

 fine and occasional, irregular, coarser, concentric striae ; edge of the shell inter- 

 nally finely crenulated ; muscular impression distinct ; siphonal groove shallow, 

 inconspicuous ; shell moderately convex in outline ; apex recurved, subcentral, 

 nearer the posterior margin ; interior 6f shell enamelled, with same color marks 

 as externally ; number of specimens, twenty-five. 



Measurements of the largest and smallest as follows: long. .93 inch, lat. .71 

 inch, alt. .47 inch ; long. .73 inch, lat. ..^4 inch, alt. .3.'i 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. 



Cerithidea tunita, Stearns. K.'z.if 



Shell small, elongately conic, rather delicate, purplish white to dark purple, 

 with whitish revolving band on the middle of the whorls, inconspicuous 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 little below the periphery of the last whorl, 

 with a single narrow, revolving 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 ; la- 

 bium anteriorly prolonged, angulated ; in some specimens the peristome is con- 

 tinuous. Number of specimens (adult) about one hundred, varying in measure- 

 ment from long. .51, lat. .16 inch to long. .33, lat. .11 inch. 



Habitat : Point Penallis, Tampa Bay, west coast of Florida, where I found 

 it abundant beneath a confervoid growth in a shallow lagoon, associated with 

 Cijrena FLridana; also Mullet Key, Col. E. Je^'ett ; Dr. Stimpson found spe- 

 cimens at other points on Tampa Bay. 



C. turi'ita is much smaller than Say's species (C. scahriformh), which has a 

 greater number of longitudinal and several revolving ribs ; it is a more delicate 

 and handsomer shell than C. amhiguum C. B. Ad., from Jamaica, which it 

 resembles ; it is smaller than C. costnta, of Da Costa, from New Providence in 

 the Bahamas, which latter is more finely and closely ribbed. All of the above 

 species possess 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. 



* See "Kamblcs in Florida," in Am. Naturalist, Vol. Ill, page 287. 



