20 LAND AND FKESH-WATER SHELLS OF N. A. [PART IV. 



lete revolving recldish-brown lines; aperture bluish- white within; 

 a distinct sinus at the base of the columella. 



Habitat.— Ohio Elver. 



Length about one inch. 



Distinguished from other North American species, by the armature 

 of tubercles.— /S'a?/. 



This beautiful and extensively distributed species is allied 

 only to L. Duttoniana^ Lea (for distinctive characters see 

 description of that species) ; from all others it is very distinct. 

 Besides the original locality, Jay and Troost give Tennessee, 

 and Mr. Wheatley, Kentucky, as its habitat. I have before me 

 a series of the young shells presented to the Philad. Acad. Nat. 

 Sciences, by Mrs. Say, which were collected in the AVabash 

 River, Ind. 



This shell Prof. Haldeman has made the type of his subgenus 

 Angitrema. He has also (Icon. Encyc, ii, p. 84) referred it 

 to Rafinesque's genus Pleurocera. 



8. A. I5,uttoniana, Lka. 



Melania Duttoniana, Lea, Philoa. Proc, ii, p. 15. Philo8. Trans., viii, p. 189, t. 6, 

 f. 54. Obs., iii, p. 26, Catlow, Conch. Nomenc, p. 186, Binney, Check List? 

 No. 92. Jay, Cat. 4th edit., p. 273. 



lo Duttoniana, Lea, REEVE, Monog. lo, f. 9. Brot, List, p. 29, C'HENU, Man, 

 Conchyl., i,f. 1974. 



lo fasciolata, REEVE, Monog. lo, f. 14. 



Description. — Shell tuberculate, fusiform, rather thick, yellowish, 



„. ,, ^. ^ banded; spire elevated, pointed at the apex: 



Fig. 54. Fig. 54a, ' ' ^ ^ ' 



sutures irregularly lined; whorls seven, 

 depressed above ; aperture elongated, angu- 

 lar and channelled at the base, within 

 whitish. 



Habitat. — Waters of Tenn. Duclv Eiver, 

 Moury Co., Tenn. 



Diameter, -57; length, 1-09 inches. 

 Observations. — This is a beautiful species. 

 The most perfect specimens are remarlvable for their fusiform sliape 

 and their long aperture, which presents a cui'ved columella and 

 extended sinus somewhat like the genus lo. The bands in some 

 individuals are numerous and distinct, the largest being nearest the 

 base. The tubercles form a row round the middle of the whorls of 



