CLASS III 



CRINOIDEA 



239 



wing-like or spiniform projections. The entire skeleton exhibiting a reticulated 

 structure with coarse meshes. Upper Jura. 



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

 the Lithographic Stone of Eichstiidt and Solenhofen, Bavaria. It is a 



Scwrocomu pecllnata Go]d(. Upper Jura (Kiinnieridgian) ; Ek-hstadt, Bavaria, a, Individual, natural size; 

 h, Side view of calyx ; c, Calyx seen from below, -/j ; </, 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 arms straightened out ; g. Lower 

 brachials of S. tenella Goldf. (Figs, d and f/ greatly, the others slightly enlarged.) 



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

 first clearly demonstrated by Jaekel in 1892. 



Family 7. Eugeniacrinidae Zittel. 



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



Calyx composed of five {rarely three, or four) thick, rigidly united radials, resting 

 upon a proximate composed of fused hasals and top stem-joint ; basals invisible, 

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

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

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

 cylindrical joints with granulated or striated articular faces ; terminating in a more 

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



Eugeniacrinus Miller (Symphytocrinus Konig ; Caryophyllites of pre-Linnaean 



