170 ECHINODERMATA—PELMATOZOA SUB-KINGDOM III 
Family 4. Hugeniacrinidae. Zittel. 
(Coadunata, Miller ; Holopocrinidae, pp. Jaekel.) 
Dorsal cup composed of five (rarely four) thick, rigidly united radials resting 
upon a centrodorsal ; basals invisible, tegmen unknown. Costals compressed, flange- 
like ; united by syzygial sutures, or fused 
with one another. Arms uniserial, robust, 
and incurving. Stem short, destitute of 
cirri, and composed of but a few long 
cylindrical joints with granulated or 
striated articular faces.  Dorsocentral 
thickened and expanded. Lias to Lower 
Cretaceous ; Europe. 
Eugeniacrinus, Miller (Fig. 284). 
Dorsal cup small, saucer-shaped, and 
with shallow body- 
cavity. Centro- 

Fic. 284. dorsal covered with 
Eugeniacrinus caryophyllatus, Mill. Upper Jura; five radiating ridges. 
Streitberg, Franconia. a, Calyx with centrodorsal, 
sae ee = 
seen from one side (nat. size); b, c, Ventral and dorsal B invisible w hen the 
aspects, 3/2; d, d*, First brachial, inner and upper oa A nce ic s 
surface 3 e, Second brachial, seen from the inside (nat. centi odor sal Is at 
size); f, h, E. nutans, Goldf. Same locality ; f,f*, First tached, but from the 
and second Lr fused together, seen from the outside 
and inside, respectively ; g, Arm-plate, figured in four COUYrS€ of the axial 
positions ; Dorsal ¢ ateral aspects inrollec : : iQ \es 
Ons h, Dorsal and lateral aspects of an inrolled canals (Fig. 285) it 
is apparent that 
they are pushed upward so as to be completely enveloped 
by the R. The latter are very heavy, closely united, and 
sometimes completely anchylosed. The lateral margins of 
their upper faces are extended upwards so as to form con- 
spicuous projections ; the intermediate spaces are occupied 
by transverse ridges and deep fossae. Costals two, the 
upper one axillary. Structure of arms unknown. Abun- 
dant in the Upper Jura, notably in the Spongitenkalk of 
Southern Germany, Switzerland, France, and the Car- 
pathians. Less common in the Dogger and Lower 
Cretaceous of the Alps. 
Jaekel! divides Hugeniacrinus into the following sub- 
genera :—Cyrtocrinus, Sclerocrinus, Tetanocrinus, Hugeniacrinus, 
s. str., and Gymnocrinus. The chief differential characters 
consist in modifications of the distichals, the arms, and 
articular surfaces of the radials. Eugentactinus caryo- 
Eudesicrinus, de Loriol. Stem reduced to two short pha, AS hones 
thick segments which bear the five / directly. Lias. without the arms (after 
Tetracrinus, Miinst. & typically four, rarely three or ibe chow the siliei- 
five; apparently reposing directly upon the column, as no Je. s\'! Co ee 
B or IB are visible. Upper face of the centrodorsal 
marked by four (sometimes three or five) prominent ridges which are radially 
disposed ; lower face bearing about fifteen radiating prominences, which are 

Fic. 285. 
1 Zeitschrift der deutsch. geol. Gesellsch. Bd. XLIII., 1891. 
