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



3. Callocystites jewetti-elongatus Foerste. 

 (Plate II, Fig. 6.) 



Callocystites jewetti-elongata Foerste, Ohio Jour. Sci., 17, 1917, p. 236, Fig. 2, 

 PI. II, Figs. 6 A", B. 



Base of cast of interior of the theca, showing a faint tendency toward 

 a quadrate outHne owing to faint ridges connecting middle points of 

 the four basals. The area of attachment for the column is relatively 

 large. Compare with basal view of Hallicystis imago (Hall). 



Locality and Horizon. — From the Cedarville dolomite 

 at Cedarville, Ohio. 



4. Coelocystis subglobosus (Hall). 

 (Plate I, Figs. 1 A, B. Plate II, Figs. 1 A, B; 2 A, B; 3 A, B, C; 4; 5 A, B, C, D; 6.) 



Hemicosmites subglobosus Hall, 20th Rep. New York State Cab. Nat. Hist., 

 1870, p. 359, PI. 12, Fig. 13. 



SphcBrocystites dolomitictis Jaekel, vStammesgeschichte der Pelmatozoen, 1899, 

 p. 289, plate diagram 63. 



Ccelocystis subglobosus Schuchert, Smithsonian Misc. Coll., 47, 1904, p. 248, 

 plate diagrams 36, 37. 



Callocystites sphcEroidalis Foerste, Ohio Jour. Sci., 17, 1917, p. 238, Fig. 3; 

 PI. 12, Fig. 5. 



Type figured by Hall. — The type figured by Hall is numbered 2027 

 in the American Museum of Natural History in New York City. It 

 was obtained in the Racine dolomite at Racine, Wisconsin. This type 

 never has been adequately figured or described, though the necessity 

 for this has been removed largely by the excellent plate diagrams and 

 descriptions published by Prof. Schuchert as the result of studies based 

 on material from the same horizon but from the Chicago area. 



The type figured by Hall (Plate II, Figs. 1 A, B) is a cast of the 

 interior of an abnormal specimen, lacking Plate 11. Possibly plates 16 

 and 11 are represented by a single plate in which the two component 

 plates no longer can be differentiated. In the latter case, plate 11 may 

 be regarded as attached to plate 16 and also as diminished in size and 

 lifted in position, thus changing the outlines of the surrounding plates 

 5, 6 and 17, and affecting even the more distant plates 12 and 18. The 

 upper part of the theca has been depressed obliquely along plates 9, 10, 

 15, 16 and 22, causing the circumoral part of the theca to be pushed 

 backward, and producing a corresponding distortion of all of the lateral 

 plates. The anal aperture, being situated on the right of the sagittal 

 place passing through the mouth, hydropore, and aboral pole, lies 

 within one of the areas of maximum distortion, the upper part of the 

 surrounding plates inclining strongly backward. Plates 23 and 13 have 

 weathered away. The most important difference from normal specimens 

 consists in the small width and slight depth of the invaginated part of 

 the base of this cast of the interior. 



In normal specimens (Plate II, Fig. 5 C), the base of the cast of the 

 interior of the theca is broadly, deeply, and quadrangularly invaginated. 



