26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



PAGE 



Fig. 14. Cystaster (Hemicystites) gramilatus Hall 4 



Side view of the elevated sacklike theca, X 3, exhibiting the 

 straight ambulacra, the fused minute rounded, mosaic inter- 

 ambulacral plates, the scalelike marginal ones, the anal pyra- 

 mid of raised, very small nodose plates, and the basal area of 

 attachment. 

 Cincinnatian (Maysville-Fairmount) : Cincinnati, Ohio. 



Figs. 15, 16. Astrocystites ottaivacnsis Whiteaves 23 



Photograph of one of the cotypes, X i, and outline sketch en- 

 larged, illustrating plate structure and affinities with the Mast- 

 oids. (16, after Bather.) 

 Trenton (Hull) : Ottawa, Ontario. 



Fig. 17. Lcpidodiscus (Agelacrinites) squamosiis (Meek and Worthen) 20 



Sketch of type specimen, X i, showing very squamose interambu- 

 lacra and four ambulacra curving strongly to the left and the 

 right posterior one to the right. 

 Mississippian (Keokuk) : Crawfordsville, Indiana. 



Fig. 18. Agelacrinites hamiltonensis Vanuxem 16 



View of the thin parasitic theca, X 3, exhibiting sculptured mosaic 

 interambulacral plates and curvature of ambulacra, two (4, s) 

 to the right, and three (1-3) to the left. 

 Devonian (Hamilton) : West Hamilton, New York. 



Fig. 19. Lcpidodiscus {Agelacrinites) lebouri ( Sladen) 20 



The theca, natural size, showing branching of the left posterior ray. 

 Lower Carboniferous of Northumberland, England. 



Plate 2 



Fig. I. Isorophus tennesscensis, new species 17 



The holotype, X 4, incrusting a Rafmesqiiina, illustrating the 



broad, oral area of many plates, short, much curved ambulacra, 



and large interambulacrals. 

 Trenton (Cannon limestone) : Fayetteville, Tennessee. 



Fig. 2. Walcottidiscus ■magister, new species 2 



The type specimen, X 0.6, crushed in hard shale but still showing 



the strongly curved ambulacra, i to 4 to the left and 5 to the 



right, and the polygonal mosaic interambulacral plates. 

 Middle Cambrian (Burgess shale) : Burgess Pass, above Field, 



British Columbia. 



Fig.s. 3-5. Cystaster ulrichi, new species 4 



Photograph, X 4. of the holotype attached to a bryozoan, and 



two drawings of the same exhibiting lateral and top views. 

 Cincinnatian (Eden-Economy) : West Covington, Kentucky. 



Figs. 6, 7. Foerstediscus parvtis, new species 10 



Two examples, X 4, attached to a thin-bedded limestone layer, 



illustrating the curvature of all the ambulacra to the right and 



the much imbricated interambulacrals. 

 Trenton (Hull) : Kirkfield, Ontario. 



