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



of Canadocystis emmonsi, but the general appearance of upper surface 

 of the plates supporting the food-grooves is more convex. The 

 madreporite and gonopore can not be identified with certainty. 



Number of thecal plates, as far as can be determined from the single 

 specimen at hand, about 40, arranged more or less irregularly, but with 

 a tendency toward oblique rows parallel to the distal ends of the rays, 

 apparently about 5 or 6 plates in a row, unless the number of apical 

 plates is greater than can be determined from this single specimen. 



Surface relatively smooth, without radiate folds as in Amygdalo- 

 cystites; probably with minute granules. 



Locality and Horizon. — From the Kimmswick limestone 

 at Glen Park, in Jefferson County, Missouri. Type numbered 

 10727 in Walker Museum at Chicago University. 



Remarks. — Wellerocystis presents combinations of char- 

 acteristics found in Amygdalocystites and Canadocystis. How- 

 ever, since Canadocystis appears to be a less specialized type, it 

 is probable that the relationship of Wellerocystis is closer to the 

 latter genus. Little can be said about its relationship to Malo- 

 cystites until the type of the genus, Malocystites murchisoni Bill- 

 ings becomes better known. Billings stated that the two pri- 

 mary rays of this species branched so as to produce two sets 

 of branches, 4 in each set, and he figured the supporting plates 

 of these branches as uniserial, but so unlike those of Amygdalo- 

 cystites and Canadocystis in appearance that close relationship 

 remains in doubt. 



Comarocystites and Echinosphaerites in Kimmswick 



Strata. 



In the United States National Museum at Washington there 

 are specimens of Comarocystites shumardi Meek and Worthen 

 and of a species of Echinosphaerites resembling E. aurantium 

 (Gyllenhal), which were obtained by Dr. E. O. Ulrich in the 

 railroad cut half a mile south of the station at Thebes, Illinois, 

 in the upper part of the Kimmswick formation, above the more 

 richly fossiliferous part of the Kimmswick section whose fauna 

 was investigated by Savage in detail. This occurrence indicates 

 that the cystids named belong at the top of the Kimmswick 

 formation and not at its base (Denison Univ. Bull. 19, 1920, pp. 

 179, 180, 181, 184, 196). At Thebes they are associated with a 

 species closely resembling Wellerocystis kimmswickensis. There 

 are two primary rays; that primary ray which is most distant 

 from the anal opening branches on its left side, thus making a 



