CLASS III 



CRINOIDEA 



239 



wing-like or spiniform projeäions. TU entire skeleton exhibiting a reticulated 

 struäure with coarse meshes. Upper Jura. 



I 



The only known genus, Saccocoma Ag. (Fig. 343), occurs profusely in 

 ;he Lithographie Stone of Eichstädt and Solenhofen, Bavaria. It is a 



Saccocoma jxxtiTuita Goldf. Upper Jura (Kimmeridgian) ; Eichstadt, Bavaria. a, Individual, natural size ; 

 h, Side View of calyx ; c, Calyx seen from below, -/x ; d, Two of the lower arm-plates ; e, Two arm-plates of a 

 higher order with one of the branches ; /, The upper part of one of the arins straightened out ; g, Lower 

 brachials of 5. tenella Goldf. (Figs. d and g greatly, the others slightly enlarged.) 



free-swimming form, whose affinities with the monocyclic Plicatocrinidae were 

 first clearly demonstrated by Jaekel in 1892. 



Family 7. Eugreniacrinidae Zittel. 



(Coadunata Miller ; Holopocrinidae p.p. Jaekel.) 



Calyx composed of five (rarely three, orfour) thick, rigidly united radicdsy resting 

 upon a proximale composed of fused basals and top stem-joint ; basals inrnsiblCj 

 tegmen unknown. Costals compressed, flange-like ; united by syzygial sutwes, or 

 fused with one anofher. Arms robust, and incurving, usually branching on the 

 second brachial. Stern short, destitute of cirri, and composed of but a few long 

 cylindrical joints with granulated oi' striated articular faces ; terminating in a mm'e 

 or less lobed, encrusting root. Lias to Lower Cretaceous ; Europe. 



Eugeniacrinus Miller (Symphytocrinus König ; Caryophyllites of pre-Linnaean 



