CLASS III CRINOIDEA 225 



Subfaniily B. Graphiocrininae Ballier. 



No radianal. Anal x more or less between radials. Arms dichotomous, uniserial 

 to hiserial. Infrabasals usually five, frequently minute, liidden hy the column, Stern 

 usually round, cirriferous. Lower Carboniferous to Upper Carboniferous. 



Graj)hiocrinus Kon. (Scaphiocrinus RaW ; Phialocrinus Trautschold; Aesiocrinus 

 Miller and Gurley) (Fig. 328). Calyx low, turbinate or obconic to bowl- 

 shaped. Infrabasals minute to fair size. Arms 

 uniserial, usually long, slender, branching once, 

 sometimes unbranched in one or more rays, making 

 the number variable from five to ten. Bracbials 

 quadrangular. Ventral sac very large and con- 

 spicuous. Stern round, with long cirri throughout. 

 A genus of ereat stratierraphic ränge and wide fio. 328. 



T , .^ ,. T /TT-- 11 1 \ , TT i-^ Analy8isofGra;)7aocrmtt*'. ib, In- 



distribution. Lower (KindernOOk) to Upper Uar- frabasals ;&, Basais ; r, Radials ; 



boniferous ; North America, Belgium and Russia. Satitr).^ ' ^'' ^'*'^'^^' ^^^^'' 



Bursacrinus Meek and Worthen. Calyx obconic. 

 Arms rather broad, closely abutting, branching twice or more, to some extent 

 as in Zeacrinus ; uniserial, with quadrangular brachials. Ventral sac incon- 

 spicuous. Very rare. Lower Carboniferous (Burlington); Mississippian area, 

 North America. 



Delocrinus Miller and Gurley {Ceriocrinus White, non Koenig). Similar to 

 Graphioc7'inus, but with concave base, ventral sac inconspicuous, and heavy 

 biserial arms. Axillary primibrach frequently protuberant or spiniferous. 

 Infrabasals at bottom of a deep funnel, hidden by column. Stern rather small, 

 round, cirriferous. Upper Carboniferous ; North America. 



Cibolocrinus Weller. Dorsal cup low, bowl-shaped. Infrabasals three. 

 Other parts unknown. Permian ; Western Texas. 



Subfamily C. Encrininae Austin (emend). 



Dorsal cup with perfed pentamerous symmefry, having no radianal or anal 

 plate. Arms dichotomous, biserial; usually Jieavy, and two to the ray. Ventral 

 sac inconspicuous or wanting. Infrabasals five, coalesced into one, or atrophied. 

 Calyx usually low, bowl-shaped, with rounded or more or less concave base. Stern 

 usually round. Lower Carboniferous to Trias. 



Stemmatocrinus Trautschold. Base broadly rounded. Infrabasals coalesced 

 into a large fTat pentagon. No anal x nor tube-plate visible in cup. Arms 

 ten, thick, closely abutting, and strongly resembling those of Encrinus 

 liliiformis. Lower Carboniferous ; Russia and North America. 



Erisocrinus White. Base rounded, with but little concavity. Infrabasals 

 five, fairly large, not in a fui^nel, usually visible outside of the stem. Anal 

 « or a tube-plate rests on the upper surface of posterior radials. A close 

 derivative from Delocrinus, which it resembles in the arms and general form, 

 difFering in the base and absence of anal plate in the cup. Upper Carbonifer- 

 ous ; North America. 



Encrinus C. F. Schulze (Chelocrinus, Calathocrinus v. Meyer ; Flabellocrinus 

 Klipstein ; (?) Cassianocrinus Laube ; (?) Traumatocrinus Wöhrmann ; Porocrinus 



VOL. I Q 



