922 REPOi>^j^l898. 



Famm. GlyptocrinidcB, Melocrinidee, Patelliocrinidce (incl, Steliodiocr., Macrostylocr., 

 Allocr., Briarocr., Centriocr. [nom. mut. pro Centrocr. W. and Sp. uon Austin nee 

 Worthen]), Clonocrinidm (incl. Clonocr. Quenst. [ = Corymbocr. Ang.], Tnjbliocr., 

 Technocr.), Eucahjptocrinidce, Dolatocrinida. 



Sub-Order Batocrinoidea. — RR in lateral contact, except in post. IR. 

 Proximal anal heptagonal ; IBrj quadrangular, exc. in Periechocrinidse. Famm. 

 Tanaocrinidce, Xenocrinidm (incl.Co?wj9socr., Abacocr.), Carpocrinidcc (incl. Acacocr. 

 Desinidocr., Macavocr.), Bavrandeocrinidce, Coelocrinidce (incl. Cmlocr. [ = Aorocr., 

 AV. and Sp.], Dorycr., Agaricocr.), BatocrinidcB (incl. Hyperocr., M. and "\V. 

 [s. Uperoci-.'] = Lobocr., W. and Sp.), Periechocrinidm. 



Sub-Order Actinocritioidea. — RR in lateral contact except in post. IR ; 

 proximal anal hexagonal ; IBrj usually hexagonal ; BB 3, equal, forming a hexagon. 

 Famm, Actinocnnidee (as in Wachsm. and Spr., exc. Amplwracr. which forms — ) 

 Ain2)hovacrinid(e. 



Sub-Class B. Dictclica. — Base consists of BB and IBB, the latter being liable 

 to atrophy or fusion with the proximale, but the aboral prolongations of the cham- 

 bered organ are always radial ; new columnals may or may not be introduced at 

 the proximal end of the stem. 



Order 1. Inadunata. — Dorsal cup primitively confined to the patina and occa- 

 sional intercalated anals, no other plates ever occur between RR (Grade — Dis- 

 tincta) ; Br may be incorporated in the cup, with or without iBr, but never rigidly, 

 and their corresponding Amb remain suprategminal (Grade — Articulata) ; new 

 columnals introduced at extreme proximal end of the stem. 



Sub-Order 1. Cyathocrinoidea have a fairly stout tegmen, in which five 

 orals (A, sub-ambulacrals, interradials, consolidating apparatus, of authors) are 

 usually conspicuous, helping to stiffen the tegmen, supporting the ambulacra on 

 their adjacent edges, and inclosing but not covering the peristome ; post.O 

 frequently a madreporite ; radial facet usually narrow, and arms distinct from 

 dorsal cup, unbranched or simply dichotomous ; none are known to attain the 

 pinmilate stage, but the presence of pinnules would not in itself remove a genus 

 from the Cyathocrinoidea. Famm. Carahocrinidce, Valaocrinidce (incl. Porocr., 

 Bactrocr), Eiispirocrinidce, SphcBrocrinidm (incl. Parisocr.), Cyathocrmid(e (incl. 

 Gissocr., Lecythocr.), Petalocrinida, Crotcdocrinidce, Codiacrinidm (incl. LecytMocr.'), 

 Cupressocrinidoi, Gasferocomidm (incl. Scolocr., Achradocr., Hypocr.). 



Sub-Order 2. Deiidrocrinoidea have a thin flexible tegmen, or the ventral 

 surface almost entirely occupied by a large anal tube or ventral sack ; orals incon- 

 spicuous or entirely atrophied in the adult ; no madreporite ; radial facet often 

 wide, so that the distinctness of arms from dorsal cup is not maintained ; arms 

 dichotomous, the dichotomy often irregular, leading up to a pinnulate stage. 

 Famm. Dend7-ocn?ndcs{mcl.Merocr.,Ottaivacr.,Homocr.,The9iarocr.),Bofryocnnid(e 

 (incl. Gothocr., Mastigocr., Gastrocr., Rhadinocr., Goniocr., Atelestocr., Streptocr.), 

 Lophocrinidce, Scaphiocrinida (incl. Poteriocr., Woodoci:, Zeacr., Coeliocr., Bursacr.), 

 Scytalecrinidce (incl. Decadocr.), GrapMocrinidce (incl. JE&iocr., Delocr. = Ceriocr. 

 White non Desor), Cromyocrinidce (incl. Enpachycr., Agassizocr., Tribrachiocr., 

 Phialocr., Uloci:), Encrimdce (incl. Stemmatocr., Erinocr), Pentacrinid(S (incl. 

 Dadocr., Holocr., and Sub-fam. Pentacrinince), Vintacrinidoi, Marsiqntidcp, Bathy- 

 crinidfp? (only Bathycr.). 



Order 2. Flexibilia. — Proximal Br incorporated in dorsal cup, either by 

 their own sides, or by iBr, or by a finely plated skin, but never rigidly ; plates may 

 occur between RR. Tegmen flexible, with distinct Amb and numerous small 

 iAmb ; mouth and food-grooves remain suprategminal and open. Top columnal I 

 a persistent proximale, often fusing with IBB, which are frequently atrophied in 

 the adult. Arms non-pinnulate (Grade Impinnata), or pinnulate (Grade Pinnata), 

 but always uniserial. 



Grade Iinpinnata. — All plates of the crown united by loose suture or 

 muscular articulation. IBB three, the primitive right posterior remaining as the 

 small unfused IB. Br united by waving sutures, often with patelloid plates. 

 Arms isotomous, or rami may bear ramules on one or both sides, but no pinnules. 

 Ventral groove wide and shallow; axial canal separated from it in proximal] 

 region. Five 0, between which food- grooves pass to the mouth. 



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