1872. 23 [Stearns. 
tion, which also shows near its termination a few revolving lines; in- 
tercostal spaces marked by fine incremental strize; aperture narrow, 
rather oblique, less than half the length of the shell; labrum effuse, 
externally much thickened, and deeply notched near the suture; ca- 
nal short; columella somewhat calloused and bent forward. 
Measurement: leneth of largest specimen, .35 inch, lat., .14 inch. 
Habitat: Tampa Bay, west coast of Florida, where I obtained 
specimens on the mainland at Rocky Point, and in a lagoon at Point 
Penallis, upon an oyster bar in lagoon at Pine Key, also on Long 
Key. 
This well marked species varies in color from light buff to dark 
ferruginous brown; the mouth in most of the specimens is of the lat- 
ter color. Viewed from above this simple shell has the form of a 
many short-pointed star. 
Architectonica tricarinata Stearns. 
Shell small, solid, trochiform, moderately elevated; whorls four, 
angulated, with three equidistant, prominent, revolving ribs on the 
periphery of the basal volution and two on the whorl above; suture 
distinct, sometimes marked with an inconspicuous, subnodose rib; 
aperture round, peritreme much thickened; umbilicus profound, 
strongly crenulated; color of shell white, more or less spotted and 
blotched with light red or dark umber; number of specimens, seven. 
Measurement: The largest measures long., .12 inch, lat., .16 inch. 
Habitat: Long Key and shores of mainland, Tampa Bay, west 
coast of Florida, where I found it (dead) on the beaches; it was also 
collected by Col. E. Jewett and Dr. Wm. Stimpson. 
Specimens vary one from another in sculpture and color markings ; 
in one specimen the sutural rib is of equal prominence with the other 
ribs, and in all the specimens the sutural rib is broken into slight 
nodules, which are, as well as the umbilical crenulations, regularly 
spotted with dark umber; other specimens show inconspicuous rib- 
lets on the external portion of the outer lip, which soon blend into 
the general surface of the shell. 
Siphonaria naufragum Stearns. 
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, irrecular, coarser, concentric 
striz; edge of the shell internally finely crenulated; muscular impres- 
sion distinct; siphonal groove shallow, inconspicuous; shell moder- 
ately convex in outline; apex recurved, subcentral, nearer the pos- 
