PLATE XIV. 



Page 



Figs. 1 to8. Phyllodiotta takia, n. sp 14^ 



1. A fragment with subparallel margins, natural size. 



2. Surface of same xg. 



3. Two rows of apertuifes xi8; shows the papillose character of the ridges. 



4. Vertical section, xi8. By an oversight the diaphragms are wanting in this figure. 



Bach tube should have one crossing it at right angles at a point about midway between 

 its aperture and the mesial line. 



5. Tangential section xi8. The internal characters are but illy preserved In even the best 



of the specimens sectioned. 

 6 and 7. Old zoarium of the natural size with a portion of its surface xg. With age the 

 maculae become more distinct and the longitudinal arrangement of the zooecial aper- 

 tures less obvious. 



8. Portion of a zoarium larger and wider than usual; natural size. 

 Middle third of the Trenton shales at Minneapolis. 



Figs. 9 to 11. EURYDICTTA MULTIPOKA (?Hall, Sp.) 13! 



9. Fragment of a slightly undulating expansion, natural size. 



10. Surface of same, xg. 



11. Small portion of same, xi8, 



Upper third of the Trenton shales, St.. Paul. Survey Museum, Reg. No. 5942. 

 Figs. 12 to 21- Abthropob A simplex Ulr 17' 



12. Two segments of the usual size. 



13 and 14. Two biflurcating segments, probably abnormal; natural size. 



15. Several segments preserve! In their natural positions, natural size. 



16. Surface of a well preserved fragment, xi8. 



17. Several zooecial apertures of same, X35. in many specimens the longitudinal prolon- 



gations from the ends of the inner ring of papillae are longer. In some cases even 

 joining. 



18. Irregularly divided basal joint, natural size. 



19. The lower part of same, xg. It is difficult to malie out the apertures, the whole sur- 



face appearing to be covered with closely intertwining strife. 



20. Vertical section, xi8. showing the form of the zooecia, the hemisepta, and other fea- 



tures. 



21. Three portions of a tangential section, x35. In a the right hand third shows the struc- 



ture just beneath the surface. In the middle third the section sinks to the level of 

 the prostrate part of the zooecia and in some of them both kinds of hemisepta are 

 shown. On the left side the dark band represents the noncelluliferous margin. In 

 c we have only the prostrate part of the zooecia and the dense margin. 

 Middle third of the Trenton sSales at Minneapolis. 



Figs. 22 to 25. Akthropoea bifurcata, n. sp 17f 



22. A small segment natural size and its upper part xi8. 



23 and 24. Two old segments, the last one probably the basal, of the natural size. 

 25. Surface of the original of fig. 23, xi8, illustrating the aged condition in contrast with 

 the youthful stage represented in flg. 22. 

 Upper third of the Trenton shales, St. Paul. 



Fig. 26. Akthropora eeveesa, n. sp 17f 



Natural size view of an average segment, and a portion of its surface x35. 

 Base of the Galena shales at St. Paul. 



