MARINE MOLLUSCA OP THE UNITED STATES. 21 



This is the largest species of gasteropod known, attaining to 

 the length of from one to two feet. 



Southern Coast, from North Carolina to Florida. 



2. F. TULIPA, Linnaeus. Fig. 20. 



(Murex.) Syst. Nat., edit. xi. 754. 1758. 



Fusiform, ventricose, spirally, irregularly grooved, suture cre- 

 nated. Bluish-white, variegated with chestnut or olive blotches, 

 sometimes spirally encircled with black lines ; flesh color within. 



North Carolina (rare] to West Indies. 



3. F. DISTANS, Lamarck. Fig. 21. 



Anim. sans Vert. vii. 119. 1822. 

 < 

 Fusiform, ventricose, smooth, polished, spirally ridged at the 



base ; whitish, variegated with chestnut blotches, and encircled 

 with distant black lines. 



Distinguished from F. tulipa by its smaller size and more dis- 

 tant revolving black bands. It is probably not distinct. 



North Carolina to West Indies. 



4. F. LIGATA, Mighels and Adams. Fig. 22. 



Bost. Journ. K Hist., iv. 51, t. 4, f. 17. 1842. 

 Ptychatractus ligatus, Stimpson, Am. Journ. Conch., i. 590. 1865. 



Shell elongate, fusiform, thick, reddish; whorls six, convex, 

 with revolving ribs ; spire acuminate, suture strongly impressed ; 

 aperture ovate-elongate ; lip crenate ; columella with two folds. 



Gulf of St. Lawrence. 



This is certainly an aberrant/ form, -and its pertinence to the 

 genus is extremely doubtful. 



Genus CANCELLARIA, Lamarck. 



Prodi-cm. 1799. 



According to M. Deshayes, the Cancellaria is a vegetable feeder. 

 The typical species have strong oblique plaits on the columella ; 

 they range from low water to forty fathoms and inhabit warm 

 latitudes. About seventy-five species have been described. 



1. C. RETICULATA, Linnaeus. Fig. 23. 



(Voluta.) Syst. Nat., edit. xii. 1190. 1767. 



Shell oblong-turbinated, imperforated, solid, spire exserted; 

 whorls convex, everywhere obtusely reticulated; whitish, banded 

 and variegated with red-brown ; aperture rather narrowly ovate, 

 interior strongly ridged, plaits two, very prominent. 



Southern Coast from North Carolina {rare} to West Indies. 



