84 The Ohio Journal of Scie?ice [Vol, XIX, No. 1, 



Plate IV. 



Fig. 20. Group of young agelacrinites austini var. lawshe, from Lawshe, Adams 

 County. Seen from the aboral side. On valve of Ischyrodonta ovalis (?). 

 X 4. 



Fig. 21. Agelacrinites austini, var. lawshe, to show the vertical ridges on the 

 aboral side of many plates, especially those of the peripheral ring. X 3. 



Fig. 22. Agelacrinites austini, var. lawshe. To show the floor plates of most of the 

 food-grooves and the substomial chamber. Aboral side. X 3. 



Fig. 23. Agelacrinites austini, var. lawshe. Aboral view of one of the largest 

 specimens found. Shows one of the modified first flooring plates bound- 

 ing the substomial chamber with its lateral projections. 



Fig. 24. Group of older Agelacrinites austitii, var. lawshe on Ischyrodonta. X two- 

 thirds. As compared to Fig. 20 five specimens occupy a shell similar to 

 the shell with over 30 specimens in Fig. 20. 



Fig. 25. Agelacrinites from Eaton (Elkhorn) showing substomial chamber, anal 

 pyramid and hydropore (indicated by arrow). X 4. 



Fig. 25A. Agelacrinites from Elkhorn Creek showing substomial chamber, hydro- 

 pore and a food-groove, No. 4, which has lost its flooring plates. The 

 path of the groove is indicated by crosses, X 4. 



Plate V. 



Fig. 26. Agelacrinites holbrooki from the Dyche collection showing the character 

 of the re-entrant rays. X 2. 



Fig. 27. Agelacrinites warrenensis. Photograph of the type specimen from the 

 Dyche collection published now for the first time. According to Foerste 

 a young A. cincinnatiensis . X 4. 



Fig. 28. Fragments of a specimen of Agelacrinites rectiradiatus Shideler showing a 

 few cover plates. The reticulate condition of two rim plates. From 

 Grace's Run, Adams County. Coll. W. H. Shideler. X 3.5. 



Fig. 29. Agelacrinites rectiradiatus, perfect small specimen from Cherry Creek, 

 Adams County. Coll. W. H. Shideler. X 4. 



Fig. 29A. Agelacrinites cincinnatiensis, perfect young specimen with nearly straight 

 rays. 



Fig. 30. Agelacrinites rectiradiatus, larger specimen showing the characters of 

 the species. Elk Run, Adams County. X 3. 



Fig. 31. Streptaster vorticellattis from oral and aboral sides. Dyer collection. 

 The substomial chamber is shown near the bottom of the specimen 

 seen from the aboral side, which is the lower of the two. The specimen 

 showing the oral side is unusually perfect showing interradial plates, 

 marginal plates and the peripheral ring plates at the upper side. X 2.5. 



Plate VI. 



Fig. 32. Agelacrinites austini var. lawshe, aboral view of very small specimen. 

 Showing the five first flooring plates, the substomial cavity formed by 

 them and the circular depression or groove outside of the first flooring 

 plates. X 40. 



Fig. 34. Another specimen showing the same points as Fig. 32. X 30. 



Fig. 33. A specimen, aboral view with three flooring plates under each food 

 groove. The outlines of the flooring plates have been dotted in on the 

 photograph. X 8. 



Fig. 35. A group of small specimens from the oral side. Some of the best pre- 

 served ones outlined in ink. These probably have no permanent cover 

 plates except what will go into the peristomial plates and only one 

 flooring plate in each food groove. X 4. 



Fig. 36. A specimen, aboral view like Fig. 33 but with four flooring plates under 

 each food groove. X 6. 



Fig. 37. One of the specimens from the oral side seen in Fig. 35 magnified 40 

 times. The anal pyramid of about six plates is shown and a few disc 

 plates. There are no specific cover plates for the grooves. Food grooves 

 four and five seem to be separating at the right. There is one row of 

 peripheral ring plates, one row of marginal plates. 



