1853.] 817 



The earliest fossil that I can recognize among American species is Fnlgur 

 trabeatiim, Coii., from the Older Eocene of Alabama. The Lower Tertiary 

 species are comparatively small, whilst in the Miocene and later deposits they 

 are far larger and more numerous, and very characteristic of those Tertiary 

 divisions. 



Fossil Species. 



Eocene. 



1. FuLGUB TRABEATUAi. Subfusiform, thin, ventricose, with elevated re- 

 volving striae at base and more obscure ones above ; body whorl, with two dis- 

 tinct series of compressed tubercles : the humoral series continued on the spire; 

 whorls angular; beak produced, slightly sinuous; aperture patulous. 



Fusus traheatus, Con. Foss. Shells of Tert. Form, 2d ed. p. 53, t. 18, fig. 1. 

 August, 1833. 1st ed. p. 29, No 3. 



F.bicarinat7ts, Lea. Cont. p. 146, pi. v., fig. 147. Oct., 1833. 

 Locality. Claiborne. Ala. Older Eocene. 



2. F. SPINIGERUM. 



Fastis spiuiger, Con. Proceed. A. N. S. 1847, Journ. A. N. S. vol. 1, 2d 

 series, p. 117, pi. xi., fig. 32. 



Locality. Vicksburg, Miss. Newer Eocene. 



3. F. NODULATU.M. Pyrifomi, thick, with strong rugose, revolving lines, with 

 a very fine intermediate line between most of the large striae ; on the inferior 

 part of the body whorl is a space without lines, below which the whorl has a 

 slightly concave slope towards the beak ; angle tuberculated, the series con- 

 tinued on the spire near the suture ; in some specimens the tubercles margin 

 both sides of the suture ; spire short; sides of volutions concave ; labrum with 

 rather distant, prominent, acute lines within ; beak straight. 



F. nodulatum^ Con. Journ. A. N, ,S., vol. 1, 2d series, p. 207 and vol. ii. 

 p. 41, pi. 1, fig. 6, 7. 



Locality. Vicksburg, Miss. Newer Eocene. 



Miocene. 



4. F. coRONATUM. Fusiform, ventricose, with fine, closely-arranged, revolv- 

 ing, wrinkled lines ; spire short ; whorls flattened above, and having elevated, 

 compressed tubercles or short spires on the angle, which is somewhat carinated; 

 suture channelled and margined by an obtuse carinated line. 



F. coronatus, Con. Miocene Shells, cover of No. 2, 1839. 



F. canalicidatusy Lyell (not Lin.) Manual, p. 172, fig. 151. 



Locality. St. Mary's Co., Maryland. 



This fine species is very distinct from the recent canaliculattim, being'less ven- 

 tricose and having prom.inent tubercles in all stages of growth. It is abundant. 

 The largest specimen measures six inches in length. 



5. F. CANALicuLATUM. This rcccut species has been found in a fossil state, 

 but is rare. It agrees perfectly in form and character with the living shell. 



Localities. St. Mary's river, Md. Natural Well, Duplin Co., N. C' 



6. F. RUGOsuM. Pyriform, with numerous, rather coarse revolving lines, dis- 

 posed to alternate in size, and very distinct lines of growth; whorls scalariform, 

 with a tuberculated carina, the margin of which presents a waved outline, the 

 tubercles being obtuse ; spire prominent, profoundly channelled at the suture ; 

 margin of the channel carinated in young shells. Length 3 inches. 



F. ritgosns, Con. Proceed. A. N. S. vol. 1, p. 307. 



Compared with F. coro7iatu7n, this species, when adult, is comparatively 

 shorter and more inflated, with a shorter spire, much coarser revolving lines, 

 which, with the more numerous, more obtuse tubercles, give the shell a very 

 difierent appearance from F. coronatiim. 



Locality. St. Mary's river, Maryland. 



7. F. TUBERCULATUM. Fusiform, with revolving striae ; spire elevated ; angle 

 of the whorl carinated and crowned with prominent tubercles ; body whorl ven- 

 tricose. 



