Dec, 1920] Cyst ids and Blastoids 59 



One of the specimens found at Cedarville, Ohio (Plate II, Fij^^s. 

 9 A, B) also presents a globose form, but the food-grooves apparently 

 extend only half way down the globose part of the theca. It consists of 

 a rather poorly preserved cast of the interior of the theca. 



Remarks. — Hall described only two species of Gomplio- 

 cystites from the Racine dolomite, Gomphocystites glans and 

 G. claims, both from Racine, Wisconsin. The type of the genus 

 is Gomphocystites tetiax, from Lockport, New York. All of these 

 species described by Hall have long stipes, while all described in 

 the present paper have short stipes. 



Narrawayella Gen. nov. 



Cyclocystoides. — The genus Cyclocystoides was based by 

 Billings and Salter (Geol. Surv. Canada, Dec. 3, 1858, p. 86) on 

 Cyclocystoides halli Billings. The conspicuous part of this 

 species, as far as known, consists of a ring of relatively large 

 plates, surrounded by a peripheral margin of small imbricating 

 plates. The proximal half of the large plates is strongly elevated 

 above the distal half; it is evenly convex, and covered with low 

 granules. The distal half of each plate usually shows two 

 spoon-shaped depressions. The outer edge of the proximal 

 half of the large plates is under-cut, and this under-cutting 

 extends backward into proximal half of the plate as a funnel- 

 shaped pit, but it is not definitely known whether this pit 

 continues in the form of a pore entirely through the plate. 



In American strata, 6 species having this type of structure 

 are known. These are: Cyclocystoides anteceptus Hall, from the 

 Black River of the Escanaba River; Cyclocystoides halli Billings, 

 from the Curdsville member of the Trenton in Canada; Cyclo- 

 cystoides salteri Hall, from the Trenton near Saratoga Springs, 

 New York; Cyclostoides bellulus Miller and Dyer, from the 

 Fairmount at Cincinnati, Ohio; Cyclocystoides magntis Miller 

 and Dyer, from the Fairmount at Morrow, Ohio; and Cyclo- 

 cystoides huronensis Billings, from the Richmond on Rabbit 

 Island, in Lake Huron. 



None of the other seven described American species referred 

 to this genus are known to have the structure found in Cyclo- 

 cystoides halli. There is no evidence for regarding them as true 

 species of Cyclocystoides. In fact, they differ not only from 

 that genus but also among each other. 



Narrawayella. — One of these distinct groups is typified by 

 Cyclocystoides cincinnatiensis Miller and Faber, from the Corry- 



