FUSING. 49 



Fossil Genera and Subgenera. 

 Subfamily FUSINJE. 



Subgenus EXILIFUSUS, Gabb. Shell very long, slender, fusiform ; spire 

 high ; aperture produced into a long, slender, twisted canal. 



This group differs from the true genus Fmus, as restricted, by its 

 twisted, slender canal. In this character it approaches some of the 

 Neptuneae, but its high spire and strongly costate whorls show that it is 

 more nearly allied to the true Fvsxs. 



E. KERRI, Gabb. PL 28, fig. 43. Cretaceous, N. Carolina. 



Subgenus EXILIA, Conrad. Shell very narrow, costate, spire subulate, 

 canal long and narrow. 



E. PERGKACILIS, Conr. PI. 28, fig. 44. Eocene, Alab<tt/t. 

 Scarcely distinct from the typical Fusae. E,riUfnsux, Conrad (non 

 Gabb), is evidently a synonym. 



E. THALLOIDES, Conr. PI. 28, fig. 45. riiiiborne, Alabama. 



Genus TURRISPIRA, Conrad. Has not been characterized, and does 

 not seem to differ from FHXHN. 



T. SALEBROSA, Conrad. PI. 28, fig. 46. Eocene, Alabama. 



Genus PRISCOFUSTJS, Conrad. Founded on Fmm genicultts, Conrad, 

 a very poorly preserved or figured fossil ; the type has "been lost for twenty 

 years. The species is wholly unrecognizable, and should be expunged 

 from nomenclature. For this rubbish Mr. Conrad has proposed a genus 

 Priscofusus, but with neither figure nor diagnosis." Drill, Proc. Calif. 

 Ac fid. 1877. 



F. GENICULUS, Conrad. Plate 28, fig. 47. Eocene, Astoria, Oregon. 

 Subgenus SERRIFUSUS, Meek. Shell short-fusiform ; body volution 



large, and bi- or tricarinate. with carinae more or less nodose ; spire and 

 canal moderate, the latter bent and more or less twisted ; outer lip broadly 

 but slightly sinuous in outline, between the upper carina and the suture. 



S. DAKOTENSIS, Meek and Hayden, PI. 28 figs. 48, 49. Cretaceous, 

 Dakotah . 



This form so much resembles the recent Ft/tors (Hemifuxus] probotd- 

 fliferi's, Lam., that it might well be considered a fossil form of the same 

 group. 



SCALASPIRA, Conrad. This uncharacterized Miocene genus is figured 

 by me (Manual, Vol. 2, pi. 70, fig. 431) as a possible synonym with Uro- 

 salpinx. It may be a Fusus, however. 

 7 



