INSTITUTE OF SCIENCE, PHILADELPHIA. I I I 



slightly scalar. When spiny this variety has numerous (13-15) small spines 

 on the last whorl, instead of few (10-13) large ones, as in var. spiniger. 



Lower Miocene at Alum Bluff (lower bed) and the vicinity of Bailey's 

 Ferry, Chipola River, W. Florida. 



This variety is named in honor of Mr. Frank Burns, of the U. S. Geol. 

 Survey, to whose energy and faithfulness in collecting our paleontologists are 

 greatly indebted. 



F. spiniger var. tampaensis Dall. Shell resembling the last, but with the 

 spire more scalar, the top of the whorls more horizontal ; the edge in front of 

 the suture not thickened or pressed up on the preceding whorl, but with a 

 narrow, smooth space between the suture and the first spiral in front of it ; 

 while in the varieties previously described the spirals are equal, or subequal 

 and absent on the periphery, in this they alternate coarser and finer, uniformly 

 over the shell ; the lines of growth, too, are more prominent and give the 

 sculpture a sharp appearance. 



This is the commoner form in the Tampa silex-beds, and probably that re- 

 ferred by Heilprin [op. cit. p. 108) to spiniger with doubt, from an imperfect 

 specimen. It is generally about 45 mm. long, but fragments indicate that it 

 reached a length of three or four inches, preserving the characters above 

 mentioned. It has been collected by Mr. Willcox, the writer, Messrs. Shep- 

 ard, Burns and others. The internal lirje are sharp and persistent. 



F. spiniger var. perisonatuni Dall. Shell resembling the last, but with a 

 prominent thread in front of the sutural smooth band, which may be more or 

 less excavated, forming a shallow or sometimes a very marked canaliculation ; 

 the internal lirse are strong ; the keel may be tuberculate or spinose, the 

 spire more or less scalar. 



Rare in the silex-beds at Ballast Point. This is the form mentioned by 

 Heilprin (/. t.) as Fnlgur coronatnm, to which the upper part of the whorl 

 bears a certain resemblance ; but that species is quite distinct. I have not in 

 a large series been able to find any internal lir^ in F. coronatnm, though they 

 may appear in very aged specimens. It is also a much larger species, with a 

 smoother surface, than the Floridian shell. 



The present form shows such gradations in the few specimens examined 

 that it is evident that the canaliculation of the whorls at the time these ani- 

 mals lived was a character so little fixed that it was not even of specific, to 

 say nothing of subgeneric, value, as it has been reckoned to be in the species 

 making up the recent fauna. 



Fulgur scalarispira Conrad. 

 F. scalarispira Conrad, Proc. Acad. Nat. Sci. Phila. for 1S62, p. 584. 



Miocene marls at Shiloh, Cumberland Co., Southern New Jersey ; also in 

 the upper bed of the Miocene at Alum Bluff, Chattahoochee River, W. Florida. 



A single imperfect specimen was found at Alum Bluff, but the species 

 could not be mistaken. This species has a deep chink in the suture, not wide 



