30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



Plate 5 



PAGE 



Fig. I. Isorophus trentonensis, new species 17 



A complete example, X 4, attached to a brachiopod, exhibiting 

 the short, broad, slightly curved arms and the many plates of 

 large oral area. 

 Trenton (upper part of Deltoidea zone) : Trenton Falls, New 

 York. 



Figs. 2, 3. Isorophus (Agelacrinus) u^arroioisis (James) 19 



(See also pi. 6, fig. 11.) 



2. A specimen, X 3, from the original lot but better preserved than 

 the type. The broad oral area of many plates and the stout, 

 short, curved arms and large overlapping interambulacral plates 

 are characteristic. 



Richmond (probably basal Arnheim) : Oregonia, Ohio. 



3. Another specimen, X 3, attached to a brachiopod, with the 

 ambulacra more clearly defined. 



Richmond (Waynesville) : Clarksville, Ohio. 

 Fig. 4. Cincinnatidiscus (Hemicystifcs) carncnsis (Foerste) 5 



One of the type specimens, X 4, a slightly worn individual. 



Trenton (Strophomoia vicina zone) : Carntown, Kentucky. 

 Figs. 5-7. Hemicystifcs richmondcnsis, new species 13 



5. A small example, X 4> slightly abraded, attached to a brachio- 

 pod. 



6. A larger, better-preserved specimen attached to a Rafinesquiim, 

 X 4- The short, broad arms, practically straight, characterize 

 the species. 



7. Another small example, X 4, with plate structure well pre- 

 served. 



Richmond: Warren County, Ohio (5) and Versailles, Indiana 

 (6) (Waynesville) ; Adams County, Ohio (7) (White- 

 water). 

 Figs. 8, 9. Isorophus (Agelacrinus) holbrooki (James) 18 



8. A typical example, X i-5, of this globose species attached to a 

 shell. The many rows of large polygonal interambulacral 

 plates are characteristic. 



9. Lateral view of same, X 3, showing the plate detail of the 

 anal area and the adjacent ambulacra. 



Richmond (Lower Arnheim) : Morrow, Ohio. 



Fig. id. Hemicystites (Agelacrinites) rectiradiatus (Shideler) 12, 14 



Photograph of the holotype, X 3, a well-preserved specimen 



attached to a clay nodule, showing marked resemblance to H. 



chapmani (pi. 3, fig. 9). 

 Richmond (Lower Whitewater) : Olive Branch, Harshaville, 



Ohio. 



Fig. II. Isorophus {Agelacrinus) cincinnaticnsis (Roemer) 17 



Roemer's original view of the type, reversed, slightly enlarged. 

 Cincinnatian (Maysville-Bellevue) : Cincinnati, Ohio. 



