INSTITUTE OF SCIENCE, PHILADELPHIA. 12/ 



2, plate 3, Oct., 1832. The same shell was figured on pi. 49 (fig. i) of his 

 Fossils of the Medial Tertiary, -1845. See Proc. Acad. Nat. Sci. Phila. 1862, 

 p. 560, under Neptunea exilis. The shell figured by Tuomey & Holmes under 

 the name of Cobis exilis might be the young of exilis, or possibly of Burnsii, 

 or a distinct species. The shell figured as F. exilis by Emmons (p. 561, fig. 

 Ill a) is not F. exilis, but the figure is too poor to determine with certainty 

 what it is. F. Burnsii is named in honor of Mr. Frank Burns, of the U. S. 

 Geological Survey, to whose ability and energy as a collector of fossils in the 

 Southern Tertiary I am greatly indebted. 



F. Burnsii resembles F. exilis, but wants the ribs on the last whorl, which 

 is fuller and rounder, while the earlier whorls are more acute. The spiral 

 threads are minutely notched or serrated by impressed incremental lines on 

 the upper whorls. It also resembles F. eqnalis, which is a more robust shell, 

 with coarser sculpture, and built on a larger scale. There is some reason to 

 believe that Mr. Conrad considered F. Burnsii as a variety of his F. exilis, 

 from a MS. note in one of the books belonging to the late F. B. Meek, but if 

 this was his opinion I cannot join in it. Prof Meek has also recorded his 

 opinion that the two were distinct. 



Fusus ballista n. s. 

 Plate 8, figure 4. 



Miocene silex-beds of Ballast Point, Tampa Bay, Florida, rare. 



Shell of six or seven whorls, with about nine faint transverse ribs, crossed 

 by low, weak spiral threads, with subequal interspaces ; suture appressed, la.st 

 whorl rather elongated ; outer lip thin, simple ; pillar slightly flexuous, smooth, 

 with little evidence of a fascicle ; canal rather short, narrow. Max. Ion. of 

 shell 26.0; lat. about ii.o mm. 



The spiral sculpture is often badly preserved or obsolete on the siliceous 

 pseudomorphs as an incident of their mineralization. The specimen figured 

 was kindly lent for the purpose by a gentleman who had collected it for his 

 private collection. The species is represented by several rather imperfect 

 specimens in the national collection. 



Fusus caloosaensis Heilpriii. 

 Fusus caloosaensis Heilprin, Trans. Wagner Inst. i. p. 68, pi. i, fig. i, 1887. Dall, Rep, 

 Blake Gastr., p. 167, pi. 39, fig. 4, June, 1S89. 



Pliocene marls of the Caloosahatchie River and Shell Creek, Southwest 

 Florida. 



This interesting species, doubtless the Pliocene ancestor of F. tiniess2ts 

 Dall, now living in the Gulf of Mexico, was illustrated in the original publica- 

 tion from an abnormally slender and exceptionally small specimen. I have not, 

 in a large number which passed under my eyes, seen another specimen ex- 

 actly according with the shell referred to. In my report on the Blake Gas- 

 tropods, by an accident in making up the plates the figures of F. timessns and 



