THE CRINOIDEA 



197 



FAMILY 7. EUGENIACRINIDAE. Pinnata with patina of 5 RR only, 

 BB having been overgrown by RR and absorbed by a continuance of such 

 a process as produced the rosette of Antedon. RR united by close suture, 

 often fused. IBr 2 axillary, united to IBr x by syzygy or fusion. Rami 

 10, robust, incurving. Stem short ; columnals cylindrical, high, with 

 joint-surface granulate, or marginally striate ; no cirri ; root encrusting, 

 lobed. All European (see de Loriol, 

 1883, and Jaekel, 1891). Genera 

 Euyeniacrinus, J. S. Miller (1821 ; syn. 

 Symphytocrinus, Konig ; Caryophyllites, 

 Auctt. pre-Linn.), Bathonian to Lower 

 Cretaceous (Fig. CXX.). Patina cylin- 

 drical or clove - shaped, with shallow 

 depression for viscera ; radial facets 

 separated by processes ; lax rising above 

 origin of IIBr into a 3 -sided spine, 

 which perhaps helped to support the 

 tegmen ; IIBr small. Torynocrinus, 

 Seeley (1866 ; synn. Oyrtocrinus, Jaek. ; 

 ? Hemicrinus, d'Orb.), Upper Jurassic to 

 Lower Cretaceous ; patina and proximale 

 fused, the ventral surface bent to one side 

 and bearing stout arms. Gammarocrinus, 

 Querist. (1858 ; syn. Sclerocrinus, Jaek.), 

 Upper Jurassic ; patina massive, concave 

 below. Gymnocrinus, de Lor. (1879, em. 

 Jaek., 1891); Upper Jurassic; lax re- 

 markably developed. Phyllocrinus, d'Orb. 

 (1849), Bajocian to Neocomian ; RR have 

 small facets and long spines. Tormocrinus, 

 Jaek. (1891), Eocene, and Trigonocrinus, 

 Bather (1889), Oxfordian, have very 

 small radial facets, rounded spines, and 

 a deep tubular cup-cavity ; the latter 

 differs in the loss and atrophy of certain 

 rays. Dolichocrinus, de Loriol (1891 ; 

 syn. Tetanocrinus, Jaek.), Upper Jurassic ; 

 RR form a tube 10 mm. long, 2-25 mm. 

 wide, with interradial re-entrant angles 

 at its base ; the radial facets are of 

 Bourgueticrine or Antedonid type, and if 

 BB were present, as de Loriol supposes, the genus must be removed from 

 this family. FAMILY 8. HOLOPODIDAE. Pinnata with patina of 5 RR, 

 usually fused, and enclosing a relatively wide cavity. BB presumably as in 

 Eugeniacrinidae. large, surrounded by a few iAmb. lax fused to IBi^ 

 in adult, and supports stout, incurved, unbranching rami ; no stem ; 

 attachment by base of patina. No sacculi. The arm-structure led Jaekel 

 (1891) to combine these forms with the Eugeniacrinidae. Genera 

 Holopus, d'Orb. (1837), Tertiary of Italy, Recent, Caribbean Sea, shallow 



FIG. CXX. 



Eugeniacriniis caryophyllatns, partial 

 reconstruction (x 2 diam.), and in- 

 terior view of a {trimaxil (x 3 diam.), 

 on which are seen the articular facets 

 (IIBr') for the secundibrachs ; the 

 latter are only partially known. Other 

 letters as usual. (Based on the obser- 

 vations of Jaekel.) 



