INSTITUTE OF SCIENCE, PHILADELPHIA. . 40^ 



examples seen thus far exhibit little or no variability in regard to sculpture. 

 The specimens are all siliceous pseudomorphs. 



Liotia (Arene) coronata n. s. 

 Plate 17, figures 2, 2 a. 



Older Miocene of the Orthaulax bed, Ballast Point, Tampa Bay, Dall. 



Shell small, stout, turbiniform, of four whorls ; suture running just below 

 the peripheral keel ; shell spirally striate, with three moderately prominent 

 plain keels, separated by wider striated interspaces, toward the periphery ; 

 summit of the whorls regularly wrinkled at the suture, the wrinkles stronger 

 on the earlier whorls, varying from mere beads to more elongated waves in 

 different specimens, but obsolete on most of the last whorl; base rounded, 

 spirally striate, the umbilicus subcylindrical, small and deep, marginated with 

 a stout, rounded rib ; aperture subcircular, margin simple. Alt. of shell 4.0; 

 max. diam. 50 mm. 



' In the figure the sutural wrinkles are not represented with sufficient 

 strength, and are perhaps a little too round in form, though in this the speci- 

 mens vary a good deal. The species, if represented by a sufficient number 

 of specimens, would probably show a thickened peritreme, but the few yet 

 obtained are apparently not quite mature. 



Liotia {Arene ?) milium 11. p. 

 Plate iS, figure 4. 



Pliocene of the Caloosahatchie, Dall. 



Shell minute, spirally sculptured, with one smooth nuclear and two and 

 a half subsequent whorls ; spiral sculpture, between the sutures three and on 

 the last whorl between suture and umbilicus eight even, rounded, well-elevated, 

 simple threads separated by equal, channelled interspaces, in which toward 

 the aperture may be a single extremely fine intercalary thread ; interstices 

 cro.ssed by rather elevated fine lines of growth not apparent on the ribs ; 

 whorls rounded; suture distinct; umbilicus narrow, deep, bordered by a well- 

 marked isolated rib; aperture nearly circular, a little thickened, its outline 

 crenulated by the ribs. Alt. of shell 1.5 ; max. diam. 1.8 mm. 



Liotia (Arene) perarmata n. s. 

 Plate jg, figures 2, 2 b. 

 Pliocene of the Caloosahatchie beds. 



Shell small, solid, very strongly sculptured, with one small smooth 

 nuclear and three subsequent whorls; spire depressed, apex blunted ; surface 

 minutely microscopically shagreened all over with close-set incremental 

 wrinkles ; periphery with three very prominent imbricated or beaded keels 

 with deep equal interspaces ; between the suture atid the upper keel, on the 

 spire, and between the lower keel and the umbilical rib, respectively, are a few 



