10. 



and which have a few obscm*e spines near the aperture ; these 

 are, however, little more than knobs. Some hundreds of this 

 species have come under my notice. lo lurida was first de- 

 scribed by Mr. Reeve. It is only a dark variety of inermis. 

 Indeed, Mr. Anthony himself writes to j,j„_ 33^ 



me to that effect. 



The following is the description and 

 figure from the type specimen of 



lo ?!(?■(■(?«. — Shell straiglitly fusiform; 

 lurid-purple witbiu and without; whorls 

 smooth, unarmed, concavel5nmpressed round 

 the upper part, tumidly gibbous round the 

 middle ; columella scarcely twisted. 



Habitat. — Southern United States. 



Observations. — A smooth, straightly fusi- 

 form shell, of a dull, lurid-purple color 

 throughout. — lieeve. 



This species is considered by many 



concliologists to be a variety ofjluvialis : 



it may be so, but the material before 



me does not enable me to make a decision against its spe- 

 cific weight, and I think decidedly 

 that it is a good species. 



Fig. 34. 



3. I. spinosa, Lea. 



lo spinosa. Lea, rh;Ios. Trans., v, p. 112, t. 

 19, f. 79. Obs., i, p. 221. TiiooST, Cat. 

 Wheatlev, Cat. Shells U. S., p. 29. Jay, 

 Cat., 4th edit., p. 277. Bin'ney, Check 

 List, No. 402. Reeve, Monog. lo, t. 1, 

 f. 7. Hanley, Conch. Misc.. t. (5, f. 51. 



lo gibbosa, Anthony, REEVE, Monog. lo, t. 3, 

 f. 17. 



lo recta, Anthony, Reeve, Monog. lo, t.3.f.21. 



lo rliomhica, Anthony, Reeve, Monog. lo, 

 t. 3, f. 16. 



Description. — Shell obtusely tur- 

 reted, wide, horn-color, under the ep- 

 idermis banded, furnished with large 

 spines ; whorls seven ; mouth elon- 

 gate, one-half the length of the shell. 



Habitat.— llolsioM River, "Washington county, Virginia. 



