182 PROCEEDINGS OF THE ACADEMY OP [1886. 



tion in the arms, cannot be sustained. Ilis Dadocrinus, however, 

 seems to be a good generic form, and will be treated by us as 

 such. We separate from the Encrinida3 Picard's Encrinus Bey- 

 richi, which we refer to the Belemnocrinidae. Von Meyer's genus 

 Calathocrinus, which some writers assert to be identical with. 

 Encrinus, is known only from a single imperfect specimen. 



ENCRINUS (Lamarck), J. S. Miller. 



1816. Lamarck, Descr. des Aiiimaux sans vertebres (Ed. i), vol. ii, p. 435. 

 1821. Miller, A Natural History of the Crinoidea, p. 37. 

 1823. Schlotheim, Nachtr. z. Petrefactenkuude, p. 335. 

 1826-33. Goldfuss, Petrefacta. Germ., vol. i, p. 177. 

 1857. Pictet, Traite de Paleont. (Ed. ii), vol. iv, p. 337. 

 1857. Beyrich (in part), Ueber die Criuoid. d. Muschelkalk (Berl. Acad, d. 

 Wissenschaften). 



1876. Quenstedt, Petrefactenk. Deutschlands, vol. iv, p. 455. 



1877. De Loriol, Monogr. Grin. Foss. de la Suisse, p. 7. 

 1879. Zittel, Haudb. d. Palaeontologie, i, p. 383. 



1882. De Loriol, Paleont. Francaise (Ser. I), Crinoidea, p. 6. 



Syn. Entroclms and Trocldtes Agricola ; CTielocrinus and perhaps 

 Calathocrinus v. Meyer, (?) Tetracrinm Gotullo, Flabellocrinui 

 Klippstein, and (?) Gassianocrinus Laube. 



Generic Diagnosis. Dorsal cup regularly pentamerous ; short, 

 saucer-shaped ; composed of 5 underbasals, 5 basals and 5 radials, 

 all equal in size and form ; there being no azygous plates. 



Underbasals minute, rhomboidal, forming together a five-rayed 

 star ; entirely covered by the top stem joint. Basals small, hexa- 

 gonal, for the greater part hidden by the column. They rest with 

 their lower sides between two underbasals, are laterally united, 

 support with their sloping upper sides the radials, and form 

 jointly a pentagon with almost straight sides. The radials are 

 large, subquadrangular ; their distal sides once and a half as wide 

 as their lower or proximal sides ; they are thick, heavy, the faces 

 toward the basi-radial suture somewhat hollowed out, showing 

 shallow fossae, while their lateral faces indicate a syzygial union. 



Brachials two, the first quadrangular, the other pentangular ; 

 they are heavy plates with straight lateral faces by which they 

 abut against the apposed faces of adjoining plates. The upper 

 plate is axillary, supporting two arms, which either remain simple, 



