JAMES TYPES OF IIRYOZOA—BASSLER. 61 



Callopora onealll coinniunis (James). 



(See also Plate IV, figs. 8 and 9.) 



Fig. 13. Tangential section, X 20, of an average exanii^ie, exhihiting the few meso- 

 pores and angular zoceeia marking this variety, and the wall structure 

 of a Cdllopora. 



McMicken member of the Eden shale. Cincinnati, Ohio. 



Pl.ATK IL 



Bythvporn nrvtipura (NieholsonJ. 



1 and 2. Tangential and vertical sections, respectively, X 20, of one of the 

 originals of Chadeies in'mittus James. The external characters as well as 

 the internal features shown in these figures are precisely the same as in 

 the form previously described by Nicholson as Ptilodicti/a arctipora. 

 McMicken member of Eden shale, near Loveland, Ohio. 



Dekayellit nlricJd (Nicholson). 



3. A few cells of a tangential section, X 35. 



4. Portion of the peripheral region of a vertical section, X 20. These figures 



were drawn from section.s prepared from the type of MoidicuUpora ohioensis 

 James. The internal characters are in all respects like those of D. ulrichi. 

 Eden shale, Cincinnati, Ohio. 



Rldnidktya paraUda (James). 



(See also Plate Y, figs. 2, 3.) 



5. Tangential section, X 20, of stipe taken just beneath a bifurcation and show- 



ing the aged condition of this species distinguished by James as Ptilodictya 

 granulosa. 



6. Tangential section, X 20, of a younger branch agreeing with the original of 



Plilodidya purallela James. 



7. Vertical section, X 20, prepared from the same specimen as fig. 6. 



Economy member of Eden shale, Cincinnati, Ohio. 



Aspidopora erceidrica (James). 

 (See also Plate V, figs. 7, 8.) 



8 and 9. Tangential and vertical sections, X 20, drawn from James's type 



sections. 

 10 and 11. Tangential section of another specimen, X 20, and a small portion 

 of same, X 35. 



12. Vertical section, X 20, showing nearly the entire width of one of the small 



disks of this species. 

 Southgate member of Eden shale, Cincinnati, Ohio. 



Dekayiu marulata (James). 



13. Vertical section, X 20, of an average example, containing rather more of 



the extremely delicate diaphragms than usual. 



14. Tangential section of same, X 20, showing one of the macul;e which often 



occur, and the thick walls characterizing the species. 

 These sections were prepared from James's type of the species. 

 McMicken member of the Eden shale, Loveland, Ohio, 



