PLATE XXVI. 



PAGE. 



Iu^fljNUS Madisonianus, Whitfield 526 



Var. elongalus ; a, pygidium ; b, lateral view of the same. H. O, 



Iij^Enus Madisonianus, Whitfield 526 



Var. depressus ; u, pygidium ; 4, lateral view of the same. S. H. O. Stolz's quarry. 



Phacops trisulcatus, Hall 529 



Glabella. S. H O. 



Ili^nus Daytonensis, Hall and Whitfield 525 



", pygidium ; b lateral view of the same. S. H. O. 



Proetus determinates, Foerste 523 



Glabella. S H. O. 



Ill/Snus Daytonensis, Hall and Whitfield 525 



Free cheek, seen obliquely from below. S. H. O, 



Iix^Enus Daytonensis, Hall and Whitfield 525 



7. a, glabella, side view, with free cheek belonging to a smaller individual^ b, gla- 



bella, irom above ; c, posterior view of glabella. S. H. O. 

 Fig. 8. Teimnomya .(Nucui<a?) minima, Foerste 563 



8. a, view of anterior, lunule ; b, lateral view, ( the markings on this cast near the beak 



are probably accidental); c, view of posterior lunule, showing a median line 

 or ridge along the cast ; branch posteriorly on either side. H. O. Marl. En- 

 larged. 

 Fig. 9. Iu^nus ambiguus, Foerste 525 



9. «, pygidium ; b, lateral view of another specimen. S. H. 0. 



Ixi^nus ambiguus, Foerste .' 525 



a, lateral view of glabella, with movable cheek of another specimen ; b, posterior 

 view of glabella ; c, glabella. S. H. O. i 



Ii,:MGnus inSiGnis? Hall; or 111. ambiguus ? Foerste 525 



Free cheek. S. HO. 



Cypricardites Casweli<i, Foerste 561 



a, right valve; *, upper view along hinge line, beak too far forward. S. H. O. 

 Coll. of George Caswell. 



Stricki,andinia tripi,esiana, Foerste 594 



a pedicle valve; b, lateral view. S. H. O. 



Stricki,andinia tript,esiana, Foerste 594 



B/achial valve. S. H. 0. 



Cyci<onema Bii,ix, Conrad 551 



This belongs to the lorm with a low spire, and transverse striae, the revolving 

 striae being present only toward the lower side of the last whorl ; a poor draw- 

 ing. S. H. O. 



Casts of the umbiwcus of Rhaphistoma affine 



Similar casts of the umbilicus of Bucania can be distinguished only by means of 

 their symmetry, on eithei side of a median plane. H. O. Marl. 



Cyclora ai/ta, Foerste 552 



a, side views ; 6, basal view ; all of casts magnified. H. O, Marl. 



Raphistoma affine, Foerste 550 



A view from above and one from the side. H. O. Marl. 



