28G [Oct. 1847. 



Murex Mississippiensis. 



Subfusiform, with three elevated varices, and an intermediate prominent 

 obtuse longitudinal ridge ; between two of the varices on the body whorl is a 

 smaller ridge ; revolving lines prominent, alternated in size, profound on the 

 varices ; longitudinal wrinkles distinct ; labium with six prominent lines 

 within, the margin regularly foliated ; canal long. Length, 1 7-10. 



Xorth American, uncommon. It belongs to the subgenus Phyllonota of 

 3wainson. 



3felongena crassi-cornuta. 



.Fusiform : whorls concave above, and having a series of thick prominent 

 nodes on the angle of the whorls ; on the body whorl they are very large and 

 thick, becoming spines towards the mouth, that nearest the margin a very 

 thick, long, recurved spine ; towards the base is a series of thick short spines, 

 revolving lines coarse, unequal, not very prominent, waved ; longitudinal 

 wrinkles coarse and distinct. Length of fragment 3. 



I found but one specimen of this fine shell, and cut off the base in digging 

 it out of the clay. 



The genus Melokgena has no affinity with the type of Pyrula of Lamarck 

 FtrwiURof Montford.) Its true position will probably be among the Porpp- 

 ris je. I have referred to this genus the Fusus corona of Lamarck. The species , 

 have a remarkable sinus at the upper end of the labrum. 



1. Fusus spiniger. 



Fusiform, with revolving lines, and a series of elevated acute spines on the 

 angle of the large whorl ; the series continued on the whorls of the spire near; 

 the suture ; two upper whorls entire ; sides above the tubercles flattened, with 

 the revolving lines fine and indistinct ; volutions seven ; beak produced ; 

 labrum striated within. Length If. Very rare. 



It belongs to the genus Hemifusus of Swainson. 



2. Fusus Mississippiensis. 



TV arrow-fusiform ; volutions eight or nine, convex, with distant profound, 

 rounded ribs, and fine regular ornamental wrinkles ; canal much longer than 

 the aperture ; labrum striated within : beak narrow, produced, slightly bent. 

 Length If. 



3. Fusus Vicksburgensis. 

 Fusiform ; whorls convex, with revolving raised lines alternated in size, 

 and fine longitudinal wrinkled lines ; large whorl ventricose ; beak somewhat 

 bent. Length 1',. 



Ficus Mississippiensis. 

 Pyriform, thin and fragile, latticed, with acute prominent lines, the revolv- 

 ing one largest and distant, the interstices with minute revolving lines ; lon- 

 gitudinal lines closely arranged, equal; spire very short, whorls convex, the 

 two nearest the apex entire ; large volution flattened at top. Length 1. 



