74 The Ohio Journal of Science [Vol. XXI, No. 2, 



Fig. 4. Eucalyptocrinus proboscidialis Miller. 



Cast of an almost entire specimen, chiefly of the interior, including the dorsal 

 cup, the arching tegmen, constricted between the arms to a narrow tube expanding 

 at the top of the partitions sheltering the arms, surmounted by a long anal tube. 

 Republished from Jour. Cincinnati Soc. Nat. Hist., 5, 1882, p. 224, PI. 9, Fig. 2, 

 for comparison with that specimen of Crinocystis chrysalis which is used on the 

 present plate for Figure 3B. Original figure prepared from a plaster cast of the 

 original specimen, prepared by D. A. McCord, of Oxford, Ohio. Found in the 

 Cedarville dolomite at Pontiac, south of Sidney, Ohio. 



Fig. 5. Gomphocystites indianensis Miller. 



A, Viewed almost directly from above, but with part of the base showing. 

 Anal aperture a short distance above and toward the left of the mouth. B, Lateral 

 view, with the anal aperture directly beneath the mouth. The exact shape of the 

 base of the specimen is unknown. From the Osgood formation, in Jefferson County, 

 Indiana. Type numbered 6019, in Walker Museum at Chicago University. 



Fig. 6. Gomphocystites bownockeri Sp. nov. 



A, Upper surface of theca, with anal aperture a short distance on the left of 

 the oral aperture. B, Lower part of another specimen showing the ends of two of 

 the rays, drawn so as to indicate the probable form of the complete specimen. 

 There is a possibility that originally these two specimens belonged together, but 

 the broken parts no longer match. Specimens numbered 22943, collected by H. H. 

 Hindshaw, and now in the Walker Museum at Chicago University. From the 

 Racine dolomite at Chicago, Illinois. 



Fig. 7. Hallicystis imago (Hall). 



Lateral view showing the pectinirhomb of Plates 12 and 18, the anal aperture 

 being on the right. This probably is the form for which Jaekel proposed the term 

 Hallicystis elongatus. Specimen numbered 22908 in the Walker Museum of Chicago 

 University. From the Racine dolomite at Chicago, Illinois. 



Fig. 8. Hallicystis imago (Hall). 



A small theca with 5 series of plates, the plates of the middle series not being 

 in contact with each other. Numbered 21734, from the Van Home collection, in 

 Walker Museum at Chicago University. From the Racine dolomite at Racine, 

 Wisconsin. 



Fig. 9. Gomphocystites bownockeri Sp. nov. 



A, Viewed from above, with the anal aperture directly above the oral 

 opening. B, Lateral view, with a glimpse of the anterior ray at the extreme upper 

 left-hand margin of the figure, the tip of the right anterior ray showing at the 

 lower right-hand margin. Numbered 2294.5, collected by H. H. Hindshaw, and 

 preserved in Walker Museum at Chicago University. Foundin the Racine dolomite 

 in the Bridgeport quarry at Chicago, Illinois. 



Fig. 10. Lysocystites (?) nodosus (Hall). 



Exterior of theca. Figure prepared from a clay cast of an impression of the 

 exterior of a specimen in a rock fragment. This impression shows chiefly the 

 characteristics of the exterior but some of the structural features near the surface 

 also have left their traces, especially at the nodes and along the coarser radiating 

 ribs. Specimen numbered 2193, from the James collection in Walker Museum at 

 Chicago University. From the Cedarville dolomite at Wilmington, Ohio. 



Fig. 11. Lysocystites nodosus (Hall). 



A, Cast of interior of theca viewed from above, with anus. The tips of the 

 inverted cuneate elevations of the cast are seen at the lower angles of the five 

 plates belonging to the third series of thecal plates. A single plate intercalated 

 in the third series is in contact with the lower margin of the anal aperture. No 

 fourth series can he recognized. B, lateral view of the same, the cast sho^^'ing an 

 oblong elevation at the upper end of one of the sutures between the basal plates; 



