I'l.ATi: I. XVI. 



I'V.K 



I to 3 Bv> M U. and S 887 



I mod 3 Dorsal and lateral views of a spec) men from the "Central llm**tnne" of theStooea 

 Ilirt-r group at Murfreesboro, Tennessee, showing surface markings, the narrow, 

 Impressed silt-band, and peculiar Indentations along the suture line. 

 2 Aperture! view of a specimen from the Hlack River group noar Fountain, Minne- 

 sota, showing rll* on Inner surface of ventral *ld> of last whorl. In both of 

 these specimens the silt portion of the last whorl (I. e., about half a turn) Is 

 broken away. 



Figs. 4 to 8 BUCANIA HALLI V. aud S M 



4 and 6 Two views of a specimen retaining surface markings. About one-third of last 



whorl broken away. Stones River group, Cannon Fall*. M Innesota. 

 View of the umbilicus of a coarsely slllclfled shell, showing Its nearly even slope. 

 Black River group. Mercer county. Kentucky. 



7 Transverse section of Inner volutions of specimen represented by figures 4 and 5. 



8 Transverse section of a whorl of an Internal cut from Mercer county, Kentucky. 



This specimen Is somewhat doubtfully referred to this species, the back being 

 unusually convex and the sides too blunt. 



Ufa. 9 and 10 BUCANIA MINNUOTENMH U. and S 887 



Two views of the type of this species. Stones River group, Cannon Falls, Minne- 

 sota. The specimen is a cast of the Interior and slightly distorted, but pre- 

 serve* some of the surface markings and shows the peculiar Impression of the 

 umbilical slope. It Is to be noted also that the perfect shell was considerably 

 larger, a third volution at least being absent. 



Figs. 11 and I? \ KI.I.IITICA U. and S 888 



Two views of the cast regarded as the type of this species. Fuslsplra bed, Tren- 

 ton group, near Cannon Falls, Minnesota. As usual with specimens of this 

 genus, the silt portion of the last whorl Is wanting. 



Figs. 13 to If. Ulrlch 800 



Three views of a slllclfled shell, imperfect at the aperture. Upper part of Tren- 

 ton group, near Burgln, Kentucky 



Figs. 18 to "19 Hi (ASIA SUBLATA U. and S 888 



16 to 18 Three views of n small slllclfled specimen. The surface marking* have been 

 destroyed excepting for a short distance beneath the edge of th< lower lip (see 

 figure 18). Trenton group, near Burgin, Kentucky. 



19 Imperfect cast of the interior, probably of this species. Stones River group, Min- 

 neapolis. Minnesota. 



Fig*. 30 to 23 1. 1 .11. MA I'lrlch 891 



20 and 21 An Imperfect and somewhat macerated nilirlfled example, showing the angular 



dorsmu .it:. I part of the expanded apertural margin. Trenton group, near Bur- 



k'in. Kentucky. 

 22 and 23 A similar specimen from the same locality, showing the slit-band and surface 



marking*. 



Fig*. 24 and 26 BUCAMIA UXDKLKYI Safford sp 8*9 



Two views of the original type of this specie*. Trenton group. I>-K,i!t> runty, 

 Tennessee. The specimen Is partly coated by a para-It i<- tiryotoan, a* shown In 

 Safford'* figure*, but we thought It best to draw It without theae disfiguring 

 patcbe*. 



Fig*. 28 to 29 BDCAXIA XICBONEMA Ulrlch "K! 



26 to 28 Three view* o the slllclfled type, showing tin- unusually rapid expansion of the 



volutions Trenton group, Danville, Ki-ntin .. 



29 Part of dorsum of same .2, showing the delicate surface markings, the posterior 

 end of the slit, and the silt-band. 



