114 H. J. CHAPMAN ON A 
Fam. 4. Poteriocrinide (Typ. gen. Poteriocrinus, Up. Sil. to Carb.; Scaphiocrinus, Dev., 
Carb. ; Zeacrinus, Dey., Carb.; Lophocrinus, Dey.; Woodocrinus, Carb.; Bactrocrinus, Dev., 
Carb. ; Dendrocrinus, Lr. Sil.; Belemnocrinus, Carb.). ; 
Fam. 5. Hydreionocrinide (Typ. genus, Hydreionocrinus, Carb.). 
Fam. 6. Astylocrinide (Typ. genus, Agassizocrinus, Carb.). 
§ 5. Disjuncta :—Stemless, with single centro-dorsal plate, and large, thin, calyx-plates 
in few zones. Arms branched, 1-plated. 
Fam. 7. Marsupitide (Typ. genus, Marsupites, Cretaceous). 
GrRouP 2.—MULTICINCTA : 
Calyx-plates, numerous, comparatively small; radials* in several horizontal zones. 
§ 1. Squamosa:—Arms short, partly united, merging into the calyx without marked 
separation. Roof-plates scaly. 
_ Fam. 8. Ichthyocrinide (Typ. gen. Ichthyocrinus, Up. Sil. to Carb. ; Lecanocrmus, Up. Sil., 
Dev.; Homalocrinus, Up. Sil.; Mespilocrinus, Carb. ; Calpiocrinus, Up. Sil.; Pycnosaccus, Up. 
Sil.; Cleiocrinus (2), Lr. Sil. 
§ 2. Copulata :—Arms 10 or 20, conjoined more or less distinctly in pairs. Basals 4 or 8. 
Fam. 9. Melocrinide (Typ. gen. Melocrinus, Ctenocrinus, Castanocrinus, Up. Sil., Dev. ; 
Scyphocrinus, Abacocrinus, Corymbocrinus, Up. Nil.). 
Fam. 10. Calyptocrinide (Typ. gen. Eucalyptocrinus, Up. Sil. Dey. ; Hypanthocrmus, Callio- 
crinus, Up. Sil.). : 
Fam. 11. Barrandeocrinida (Typ. genus Barrandeocrinus, Up. Sil.). 
§ 3. Ornata :—Roof-plates more or less symmetrically arranged, large or small. Upper 
‘ radials and other plates often hexagonal, or hexagonally combined. Basals, in two zones, 
3 and 5, or 5 and 5. Arms branched or simple, pinnulated. Calyx-plates frequently 
ribbed or sculptured. 
Fam. 12. Habrocrinide (Typ. gen. Habrocrinus, Up. Sil. to Carb.; Desmidocrinus, Up. Sil; 
Carpocrinus, Up. Sil.; Leptocrinus, Up. Nil; Briarocrinus, Up. Nil; Culicocrinus, Dev.) 
Fam. 13. Actinocrinide (Typ. gen. Actinocrinus (including Steganocrinus, Amphoracrinus, 
Dorycrinus, etc.), Dey. Carb.; Batocrinus, Carb.; Geocrinus, Sagenocrinus (2) Dimerocrinus, Macro- 
stylocrinus, Up. Sil.; Dolatocrinus, Dev.) 
Fam. 14. Stelidocrinide (Typ. gen. Stelidocrinus, Harmocrinus, Up. Sil.; Schizocrinus, 
Lx. Sil.) 
Fam. 15. Glyplocrinide (Typ. gen. Glyptocrinus, Si; Glyptaster, Up. Sil., Dev; Lamptero- 
crinus, Up. Nil; Thysanocrinus, Sil. Dev.; Rhodocrinus, Sil. to Carb.; Rhipidocrinus, Dev.; Acan- 
thocrinus, Dey.; Ollacrinus, Dev., Carb.) 
§ 4. Opulenta :—Basals, in two zones, 8, 16 ; other calyx-plates and arms also numerous ; 
the latter branched and pinnulated. 
Fam. 16. Polypeltide (single genus, Polypelles, Up. Sil.) 
§ 5. Mutica:—Stemless. Calyx, large. Basals 5, with single dorsal plate; other plates 
numerous. Arms 10, indistinctly merging into the calyx, pinnulated at upper part. 
Fam. 17. Uintacrinide (single genus, Uintacrinus, Cretaceous.) 


*Or, in the Ichthyocrinidæ, radial and radial-like brachials. 

