1872.] 23 [Stearns. 



tion, wliicli also shows ne:ir its tLTiaination a few revolvin;^ lines; in- 

 tercostal spaces uiarkt'il by line incriMucntal stri;e; aperture narrow, 

 rather oblique, less than half the leni^th of the shell; labruni effuse, 

 externally much thickened, and deeply notched near the suture; ca- 

 nal short; columella somewhat calloused and bent forward. 



]\Ieasurement: leniith of largest specimen, .35 inch, lat., .14 inch. 



Habitat: Tampa Bay, west coast of Florida, where I obtained 

 specimens on the mainland at Rocky Poirrt, and in a lagoon at Point 

 Penallis, upon an oyster bar in lagoon at Pine Kev, also on Long 

 Key. 



This well marked species varies in color from light butf to dark 

 ferruginous brown; the mouth in most ot' the specimiuis is of the lat- 

 ter color. Viewed li'om above this simple shell has the form of a 

 many short-pointed star. 



Architeetonica tricarinata Steams. 



Shell small, solid, troeliitbrm, moderately elevated: whorls four, 

 nngulated, with three etpudistant, prominent, n volving ribs on the 

 periphery of the basal volution and two on the whorl above; suture 

 distinct, sometimes marked with an incon-^piruous, subnodose rib; 

 aperture round, peritreme much thickened ; umlulicus profound, 

 stronglv crenulated; color of sliell white, more or less spotted and 

 blotched with light red or dark umber; number of s|)ecimens, seven. 



Measurement. The largest measures long., .I'l inch, lat., AH inch. 



Habitat: Long Key and shores of mainland. Tampa Bay, west 

 coast of Florida, wlu/re I found it (dead) on the lie iches; it was also 

 collected by Col. E. Jewett and Dr. \Vm. Stimpson. 



Specimens vary one from another in sculpture and color markings ; 

 in one specimen the sutural rib is of eipial prominenci- with the other 

 ribs, and in nil the specimens the sutural rib is broken into slight 

 nodules, which are, as well as the umbilical crcnulations, regularly 

 spotted with dark umber; other specimens show iucou>picuous rib- 

 lets on the external portion ot the outer lip, which so(ju blend into 

 the general surface of the shell. 



Siphonaria naufragum Stearns. 



Shell oval, depressed conic, with numerous fnie radiating ribs of a 

 whitish color, the interspaces of a reddish or chocolate brown; also 

 marked liy many fine and occasional, irregular, coarser, concentric 

 fetriaj; 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 pes- 



