28o TRANSACTIONS OF THE WAGNER FREE 



swollen varices; spiral sculpture of from three to five primary ridges, which 

 are smooth over the varices, but elsewhere generally beaded ; between these 

 are smaller secondary, often wavy, threads, separated from the adjacent prima- 

 ries by one, two, or even three extremely fine simple tertiary threads. The 

 varices number at least one to the whorl, they are prominent and swollen, but 

 not sharply defined ; they grow narrower as the shell becomes more nearly 

 adult. The base is spirally threaded with faint beading, the pillar smooth and 

 without plait or groove, the canal distinct and recurved ; the sutures are dis- 

 tinct and appressed, whorls moderately rounded. The shell measured 50 to 

 60 mm. in length, with a diameter of about 14 mm. 



The specimens in hand are so fragmentary as to render it inadvisable to 

 figure them, as better ones will, no doubt, soon be obtained. It is certainly 

 distinct from any species known in our Tertiaries, and of a type not recalled by 

 any of our recent species, having a curious general resemblance to a Cohtbraria, 

 owing to its compact sculpture and swollen varices. The transverse sculpture 

 seems confined to the beading and varices. 



Cerithium Burnsii n. s. 

 Plate 14, figure 12. 



Newer or Chesapeake Miocene of the upper bed at Alum Bluff on tlie 

 Chattahoochee River, Florida, Frank Burns. 



Shell solid, strong, nuclear whorls lost, with ten or more subsequent 

 whorls; spiral sculpture of seven or eight revolving, flattened threads, with 

 narrower, channelled interspaces, variable in size; one at the periphery, another 

 on which the suture is wound, and one or two more on the base, being larger 

 than the rest; the surface of the specimens is somewhat worn, but there are 

 hardly any indications of fine spiral striation; the spirals on the last whorl are 

 somewhat wavy, that on the basal margin and those near the suture on the 

 last whorl have some tendency to become nodulated ; transverse sculpture of 

 about eight narrow, strong, rounded ribs extending across the whorls and angu- 

 lated at the intersection of the peripheral spiral ; one of these on each whorl is 

 a little larger than the others, but the only conspicuous varix is that at the end 

 of the first third of the last whorl ; suture distinct, appressed ; base somewhat 

 excavated; pillar short, arched, simple; canal narrow, deep, recurved ; body 

 with a strong callus with its edge free ; outer lip thickened, arched, with faint 

 sulci inside corresponding to the sculpture ; at the junction with the body is a 

 moderate sinus and sub-sutural, elevated ridge which enters the throat some 

 distance. Length of shell 55 ; max. diam. 20 mm. 



This fine species is represented by two specimens, of which one is imper- 

 fect, collected by Mr. Burns and now in the National Museum. 



