lO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



POSITION UNCERTAIN 



Family ASTROCYSTITIDAE, new name 



(Steganoblastidae Bather) 



ASTROCYSTITES Whiteaves, 1897 



(Stcciaiwblastus Whiteaves, 1897) 



Regarded liy Rather as an cdrioasteroid and ])y Hudson as a 

 blastoid. 



Family CYCLOCYSTOIDTDAE S. A. Miller, 1889 

 (order uncertain) 



Genera Cyclocystoidcs Billings and Salter, 1858; Narrazvayella 

 Foerste, 1920; SavagcUa Foerste, 1920. 



EXPLANATION OF PLATE 



Fig. I. WalcottidiscHs typicalis, new genus and species. Tlie holotype, X 3, a 

 crushed theca showing the oral side. Middle Cambrian (Burgess 

 shale) Burgess Pass, near Field, British Columbia. 



Figs. 2, 3. Canieyclla (Agclacrinus) pilciis Hall, 1866. View of oral side of 

 theca and lateral view, X 2, showing the sacklike form. Maysville 

 (Fairmount formation) : Cincinnati, Ohio. 



Fig. 4. Cystastcr (Hemicystitcs) granulahis Hall, 1871. Side view, X 2, of 

 the elongate theca. Maysville (Fairmount formation) : Cincinnati, 

 Ohio. 



Fig. 5. Slrcptaster (Agclacriiuis) voriiccllatus Hall, 1856. Oral side of theca 

 slightly enlarged, exhibiting the elevated ambulacra all revolving 

 toward the left. Maysville (Fairmount formation) : Cincinnati, 

 Ohio. 



Fig. 6. Ciiicinnaiidisciis (Agelacriiius) sfellatus Hall, 1866. Oral side of the 

 depressed, attached theca, with straight arms, X 2. Maysville (Fair- 

 mount formation) : Cincinnati, Ohio. 



Fig. 7. Ulrichidiscus (Agelacriiius) pitlaskicnsis Miller and Gurley, 1894. View 

 of the semiglobose theca, natural size, showing strong curvature of 

 all ambulacra to the left. Chester (Glen Dean formation) : Pulaski 

 County, Ky. 



Fig. 8. Pyrgocystis sardcsoni Bather, 1915. Side view of theca, X I2, showing 

 the solid basal portion of many imbricating plates surmounted by 

 the oral surface. Black River (Decorah) shales: St. Paul, Minn. 



Fig. 9. Coopcridisciis (Lepidodisais) alleganius Clark, 1901. Oral side of the 

 free, globular theca, X I2, exhibiting the very narrow ambulacra all 

 curved to the right and the highly imbricated interambulacral plates. 

 Chemung formation: New York. 



Fig. 10. Canieyclla cincinimtiensis, new species. \'iew of the attached, thin cir- 

 cular theca with ambulacral structure of Canieyclla, X 4- Maysville 

 (Corryville formation) : Warren County, Ohio. 



