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



under consideration toward their right, or in a counter-clockwise 

 direction. These changes have been accompanied by an increase in the 

 height of the theca and a steepening of its lateral walls. The column, 

 at its contact with the base of the theca, has a diameter of 6.5 mm. 



In a specimen numbered 1603 (Plate II, Fig. 4), belonging to the 

 Illinois State Museum of Natural History, from the Racine dolomite at 

 Racine, Wisconsin, the lateral diameter of the theca is distinctly nar- 

 rower than the one from front to rear, the theca is rather high, and the 

 circum-oral parts have been pushed strongly forward, therefore, in a 

 direction opposite to that shown by the type of Ccelocystis subglobosus. 



Ohio specimens. — In Ohio, Coelocystis subglobosus is known from the 

 Cedarville dolomite both from Cedarville, and from the Moodie quarry 

 at Wilmington. 



The Cedarville specimen (Plate II, Figs. 3 A, B, C) is low and broad, 

 with only a faintly invaginated base, but otherwise does not differ from 

 typical specimens from the Chicago area. 



The Wilmington specimen (Plate II, Figs. 2 A, B) is a much taller 

 specimen and also has a faintly invaginated base. Faint flexures on 

 this cast of the interior of the theca suggest that ambulacra resembling 

 those of Callocystites reached as low as the margin of the invaginated 

 part of the base, branching at least once, at about the level of the anal 

 aperture. 



Apparently this species is remarkable, among GlyptocystidcB, for the 

 number and variety of its possible variations. 



Exterior of Cxlocystis subglobosus. — In the Cedarville dolomite at 

 Springfield, Ohio, two casts of the exterior of a globose Callocystid 

 have been found, one of which was described and figured under the 

 name Callocystites sphceroidalis Foerste (Ohio Jour. Sci. 17, 1917, p. 238, 

 fig. 3; pi. 12, fig. 5). The second specimen (Plate II, Fig. 8 of the present 

 paper) supplements the first by showing the pectinirhomb on plates 

 1-5, and by showing definitely that the rays branched more than once. 

 The entire theca must have been at least 4 mm. wider than the figure, 

 the missing parts not being preserved in the specimen. The column was 

 very large, considering the relatively small size of the theca. The surface 

 of the first specimen is granulose, there being a tendency toward the 

 arrangement of the granules in rows, about 6 or 7 granules in a length 

 of 5 mm. On parts of the specimen the arrangement appears to be in 

 diagonally intersecting rows; on other parts the rows take the form of 

 parallel ridges, the transverse rows not being in evidence. On the second 

 specimen the ornamentation consists of sets of parallel short ridges, not 

 well brought out in the accompanying figure, the sets on different sectors 

 of the plates being directed in different directions. The granules are 

 not in evidence exc ept as elevations irregularly dotting the crests of the 

 ridges. It can not be determined from our present knowledge whether 

 these specimens represent two distinct species. 



In the collections in Walker Museum at Chicago University there is 

 a black wax cast (Plate I, Figures 1 A, B) in the same tray with a spec- 

 imen of Coelocystis subglobosus, numbered 22906, and labeled as coming 

 from the Hindshaw collection, which was made at Chicago, Illinois. 



