318 [April, 



F.tuherculatus^ Con. Miocene Shells, cover of No. 2, 1839. 



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



Allied to F. fusiformis, but is more ventricose, proportionally shorter. It 

 may readily be distinguished by the carina of the volutions, which is very 

 strongly marked towards the apex. 



8. FuLGUR CARICA. {PyruJa carica Lam.) 

 Locality. North Carolina. Prof. E. Mitchell. 



A large specimen of the variety with short spines, is in the collection of the 

 Academy of Natural Sciences. 



9. F. FusiFORME. Fusiform, with revolving stria? ; obsolete, except on the 

 inferior half of the body whorl, where they are prominent, wrinkled and alter- 

 nated in size ; spire elevated ; whorls with obtuse little prominent tubercles on 

 the angle which is situated near the suture and is obtuse. 



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

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



10. F. MAXIMUM. Pyriform, ventricose, moderately thick, with coarse distant 

 subimbricated lines of growth; spire short, with revolving striae; whorls con- 

 cave above, rounded inferiorly ; beak long and sinuous; columella very concave j 

 aperture patulous. Length 1^ inches. 



F. inaximuS) Con., Miocene Shells, cover of No. 2, 1839. 



Locality. Yorktown, Virginia. 



There is a variety of this shell thick and ponderous ; angle of penultimate and 

 body whorls with short distant arched or foliated spines, each of which is con- 

 nected with a longitudinal line or fold ; lines most prominent towards the base 

 where the beak is somewhat tumid. 



This is the largest fossil species known to me, and resembles F.'ariiamim, but 

 the rounded volutions of the spire is a striking point of difference. 



11. F. iNciLE. Fusiform, with distant coarse, prominent and fine impressed 

 revolving lines ; body whorl profoundly ventricose, shoulder rounded, summit 

 with a broad concave furrow margined by a profound carinated line, between 

 which and the suture is a wide profound channel; spire conical, elevated, whorls 

 ventricose; aperture dilated. Length Synches. 



F.incilis, Con., Sillim. Journ. vol. xxiii. p. 343. 



Locality. Yorktown, Virginia. 



This large species distantly resembles F. canaliculatum. It is much thicker 

 and more ponderous, with a more elevated spire, and with rounded volutions 

 destitute of tubercles. 



12. F. coNTRARiuM. Pyriform, sinistral, with wrinkled revolving lines, obso- 

 lete on the middle of the large whorl ; shoulder obtusely angulated, without 

 tubercles; summit of the whorls concave; whorls of the spire angulated in the 

 middle, and slightly tuberculated on the angle ; beak very long, sinuous ; labrura 

 with distant prominent lines within. 



F. contrariits. Con., Silliman's Journ. vol. xxxix. p. 387. 



Locality. Natural Well, Duplin Co., N. C. 



A much smaller species than F. perversKm^ differing in its want of tubercles 

 on the shoulder when adult, (for young shells have small tubercles, not com- 

 pressed as in the kindred species.) The shell is proportionally thicker, the 

 columella more concave and^the angle more prominent. 



13. F. ExcAVATUM. Pyriform, with revolving lines, very prominent on the 

 inferior half of the large whorl; shoulder with a wide concave depression; 

 spire widely and profoundly chaimelled, the whorls bicarinated and slightly 

 tuberculated on the carinae. 



Jp. excavatus. Con., Sillim. Journ. xxxix. p. 3S7. 

 Locality. Natural Well, Duplin Co. N. C. 



14. F. Oregonense. Fusiform with unequal prominent revolving lines, a few 

 of which are considerably larger than the others, on the upper portion of the 

 body whorl : they are also coarser towards the base, and attenuated in sizej 



