Fig. 



4. 



4. 



Fig. 



5. 





0. 



Fig. 



6. 





6. 



Fig. 



7. 



7. 



Fig. 



8. 

 8. 



PLATE XXVI. 



PAGE. 



Fig. 1. Ill^nus Madisonianus, Whitfield 526 



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



Fig. 2. Iee-Enus Madisonianus, Whitfield 526 



2. Var. depressus ; a, pygidium; b, lateral view of the same. S. H. O. Stolz's quarry. 

 Fig. 3. Phacops TrisuecaTUS, Hall 529 



3. Glabella. S. H O. 

 Ile^EnuS Daytonensis, Hall and Whitfield 525 



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



Proetus determinants, Foerste .... 523 



Glabella. S H. O. 



Iee-Enus Daytonensis, Hall and Whitfield 525 



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



Ile^Enus Daytonensis, Hall and Whitfield 52s 



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. 



Teeeinomya (Nucula?) minima, Foerste 563 



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. 



Ili^Enus ambiguus, Foerste 525 



a, pygidium ; b, lateral view of another specimen. S. H. O. 



Ile^EnuS ambiguus, Foerste . 525 



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

 view of glabella ; <:, glabella. S. H. O. 



Ile^Enus insignis? Hall; or 111. ambiguus ? P'oerste 525 



Free cheek. S. H. O. 



Cypricardites Casweeei, Foerste 561 



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

 Coll. of George Caswell. 



Strickeandinia triplesiana, Foerste 594 



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



Strickeandinia tripeesiana, Foerste •. 594 



B/achial valve. S. H. O. 



Cyceonema bieix, Conrad 551 



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

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

 ing. S. H. O. 



Casts of the umbilicus 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. 



Cyceora aeta, Foerste 552 



a, side views ; b, 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. 



Fig. 



9. 





9. 



Fig. 



10. 





10. 



Fig. 



11, 





n. 



Fig. 



12. 





12. 



Fig. 



13. 





13. 



Fig. 



14. 





14. 



Fig. 



15. 





15. 



Fig. 



16. 





16. 



Fig- 



17. 





17. 



Fig. 



IS. 





IS. 



