3TBOFODJ 



Ku.-n[ 



One seems to show obscure traces of very fine spiral lines between the stronger 



ones, and it is pos>il>le that Mich line- will he found on the perfect shell. 



.(/// i- i-li.-ely related to B. suloi/inn. hut that species has wider volutions, 

 and. although they do not enlarge any more rapidly, the proportional width of the 

 aperture i> greater. being quite equal to the hight of the shell, wliirh is not the case 

 in the pre-ent species. The whole form of that shell is also more globose. Ii. in 

 ia a smaller and lurr-mer shell, and has more closely arranged revolving ribs and 

 less depressed volutions. 



\\ have four fragmentary casts of the interior, collected in the Fnsispira bed 

 of (ioodhue and Killmore enmities. that may belong to this species. 



formation and lotaUty. Stone* River group. Cannon Falls, Minnesota (six specimens); Black River 



i-ii{ht >! 



UoUtttim*,-*. O. Dlrich. \V II 



BCCANIA MINNEHOTENSI8, n. Sp. 

 I'LATE I.XVI, FIGS. 9 and 10. 



This is associate*! with and probably closely related to H. //////. Still there 

 should be no difficulty in distinguishing the two forms since this grows to much 

 greater size and yet has the same number of volutions. The last whorl especially 

 enlarges rapidly, though relatively more in bight than in width. The sutures are 

 deeper and the slope of the umbilicus, taken as a whole, is not so flat. Still the 

 flatness of the slope increases with growth until on the last third of the outer whorl 

 it has become decidedly concave; causing the sutural portion to appear swollen. 

 The surface markings seem to be about the same in the two species. 



Formation and locality. Yanuxemla bed of the Stones River group, Goodbuc county, Minnesota. 

 CWfcdi.rn.-E. O. Ulrica. 



Hn-AMA 1MMON8I, n. 8p. 



i.xvi nog. i-i. 



This -peries ditler> from /;. linlli, which it resembles closely, in being smaller 

 and in having on the whole narrower yet more speading volutions. The volutions 

 are more rounded in the uml>iliru. causing the suture line to be deeper. The latter 

 is peculiar in being deepened at regular intervals by the development of short, 

 wave-like dents in the ventral side of the volution-, similar dents are to be seen 

 also on the sides of the volution in the Fountain specimen-, hut they cannot be seen 

 on the even better preser \. i T.-nnessee shell. These sutural indentations dis- 



ii-h the species not only from /;. lialli but from the even nearer H. inttsta and 

 all the other species now known of the genus. In a specimen 18 mm. high, the 



