3 



like, revolving rib ; color, dingy yellow to purplish black ; aperture ovate, nar- 

 row, about two-fifths of the length of the shell ; outer lip thin, with a rouiuk J, 

 shallow notch near the suture; columella nearly straight, canal short. 



Measurement: long. .67, lat. .24 inch, largest specimen ; long. ..51, lat. .18 

 inch, smallest specimen ; number of specimens, three. 



Habitat : Pine Key, Tampa Bay, west coast of Florida, where I fuuiul them 

 on bunches of oysters, in a shallow pool overflowed by the tides. The sculpture 

 varies in prominence in different individuals. 



Mangelia stellata, Stearns. /) . 2 L 



Shell small, fusiform, turritcd, yellowish tinged more or less with reddish 

 brown ; number of whorls seven, angulated above ; suture distinct ; sculptured 

 with twelve or thirteen strong, smooth, longitudinal ribs, which extend to the 

 extremity of the basal volution, which also shows near its termination a few re- 

 volving lines ; intercostal spaces marked by fine incremental strias ; aperture nar- 

 row, rather oblique, less than half the length of the shell ; labrum effuse, exter- 

 nally much thickened, and deeply notched near the suture ; canal short ; colum- 

 ella somewhat calloused and bent forward. 



Measurement : Length of largest specimen, .35, 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 Peuallis, upon an oyster 

 bar in a 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 latter color. Viewed from 

 above this simple shell has the form of a many short-pointed star. 



* Arcltiteclonka tricnrinata, Stearns, yb. x 3. 



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 Flor- 

 ida, 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 umbilioal crenulations, regularly spotted with dark umber ; other specimens 

 show inconspicuous riblets on the external portion of the outer lip, which soon 

 blend into the general surface of the shell. 



* Dr. P. P. Carpenter suggests that this is a " Miuolia.' 



