10. 11 



three adalt individuals of this species have been noticed, although I 

 have a dozen or more which seem to be immature forms of it; it may 

 therefore be considered as not only one of the most aberrant and 

 beautiful forms of lo, but also one of the rarest. — Anthony. 



5. I, turrita, Antuony. 



lo turrita, Anthont, Proc. Acad. Nat. Sci.. Feb., 18G0, p. CO. Binxey, Check 

 List, No. 405. Reeve, Monog. lo, t. 3, f. 19a. 



Description. — Shell conic, elevated, horn-colored, spinous; spines 



rather short and heavy, about seven on each ^. ,, 



^ ' Fig. 41. 



■\vhorl; whorls nine; apei'ture pyriform, about 

 one-third the length of the shell, and irreg- 

 ularly banded within ; columella rounded, 

 slightly twisted and forming a short, narrow 

 canal at base. 



Habitat. — Tennessee. 



Length of shell, 2i inches; breadth of shell, 

 \ inch. Length of aperture, | inch y l)readth 

 of aperture, 7-16 of an inch. 



Observations. — This is the most slender and 

 elongate species of this genus which has 

 come under my notice, and although a single 

 specimen only has yet been discovered, its 

 claims to rank as a species will hardly be 

 questioned ; its long, slender form, stout, 

 closely-set spines, and small aperture will at 

 once distinguish it from its congeners; two faint bands traverse each 

 whorl, one of which lies precisely in the plane of the spines; lines 

 of growth very distinct, nearly varicose. 



This species is farther removed from To Jluvialis than any of 

 the others, and appears to be very distinct. Mr. Reeve's 

 figure 196, of which I have seen the original soecinien, I 

 would refer to spinosa rather than turrita. Numtrous speci- 

 mens occur in the collection of Mr. Lea, who is well assured, 

 also, of its specific weight. The illustration is from the 

 type specimen. 



