196 1). Echinodermata. 



mit 5 Alien, 19. Physetocrinus Meek und Worthen mit 4 Arten, 20. 

 Strotocrinus Meek und Worthen mit 3 Arten, 21. Gennaeocrinus n. gen. 

 mit 7 Arten. 



F. Batocrinites. Symmetry more or less bilateral; calyx large; basals 

 three ; second radials short, linear ; higher orders of radials rarely ex- 

 ceeding three, the plates of the last order touching laterally all arroimd 

 the body, except sometimes over the anal area. Interradials few ; inter- 

 axillaries absent; first anal plate in line with the first radials, second 

 series composed of three plates; arms short, double jointed.-- Gattun- 

 gen : 22. Bntocrinus Casseday mit 35 Arten, 23. Eretmocrimts Lyon und 

 Casseday mit 16 Arten, 24. Dorycrinm F. Ronier mit 17 Arten. 



Die dritte Subfainilie wird folgendermaCen characterisirt : 

 III. Rhodocrinidae. Underbasals present ; calyx composed of basals and several 



orders of radials; interradial system well developed. 

 Die Rhodocrinidae zerfallen wieder in 3 Sectiouen : 



A. Glyptocrinites. Calyx turbinate , symmetry almost perfectly pentahe- 



dral, radial plates with rounded, strongly elevated ridges which gently 

 pass into the arms. Interradial areas depressed , the first plate resting 

 either directly upon the basals, or between the second and third radials, 

 without special anal plate beneath their line. Restricted to the Lower 

 Silurian." - - Gattungen: 1. Glyptocrinus Hall mit 12 Arten, 2. Archae- 

 ocrinus n. gen. mit 4 Arten, 3. Retecrinus Billings mit 7 Arten. 



B. Glyptasterites. Calyx turbinate. symmetry bilateral, radials less cari- 



nated than in the proceeding group. A special anal plate supported 

 upon the basals, with another within the second series, resting between 

 the two interradials , and in line with the first interradial plate of the 

 four lateral areae. Upper Silurian. -- Gattungen : 4. Glyp taster Hall 

 mit 5 Arten und mit dem Subgenus Eucrinus Augelin mit 7 Arten, 5. 

 Dimerocrinus Phillips mit 3 Arten, t>. Lampterocrinus Roemer mit 2 Ar- 

 ten, 7. Sagenocrinus Austin mit 1 Art. 



C. Rhodocrinites. Calyx subglobose, somewhat depressed ; symmetry nearly 



perfectly pentahedral. Radials without elevated ridges. Interradial 

 plates extending down to the basals, posterior area but little distinct 

 from the others , sometimes a little wider , with one or two irregular ad- 

 ditional plates. Found from the Upper Silurian to the Subcarboniferous.a 

 - Gattungen: 8. Lyriocrinus Hall mit 2 Arten, 9. Ripidocrinus Bey- 

 rich mit I Art, 10. Thylacocrinus Oehlert mit 1 Art, 11. Anthemocrinus 

 n.gen. mit 2 Arten, 12. Rhodocrinus Miller mit IS Arten, 13. Olla- 

 crinus Cumberland mit 13 Arten. 



Unter den 47 Gattungen, welche Wachsmuth und Springer zur Familie der 

 Sphaeroidocriiiidae stellen, sind 5 neue : Talarocrinus, Teleiocrinus, Gennaeo- 

 crinus, Archaeocrinus und Anthemocrinus ; ferner wird unter dem Genus Macrostylo- 

 crinus Hall ein ueues Subgenus : Centrocrinus aufgestellt. Die Diagnosen der 5 

 neuen Gattungen und der neuen Untergattung sind folgende : 



Talarocrimis nov. gen. (subfam. Platycriuidae! . (Syn. Dichocrinus Shumard partim.) 

 General form of body ovoid ; composed of heavy plates. Calyx subconical ; 

 plates convex, deeply impressed at the suture lines, and hence more or less pro- 

 tuberant; surface smooth. Basals two, pentagonal, precisely alike, the suture 

 running from the posterior to the anterior side. First radials large, quadrangular, 

 nearly as wide as high, arranged in line with the first anal plate, which is as large 

 or larger than the radials, and of similar form. The upper edge is excavated, but 

 not semicircular, there being an angular process in the middle. Second radials 



