1886.] NATURAL SCIENCES OP PHILADELPHIA. 95 



In the construction of the dorsal cup, Stylocrinus agrees with 

 Symbathocrinus. The two genera, however, differ in the articular 

 extensions of their radials, which extend only inward, not 

 upward, and form a level with the outer edges of the radials. 

 The arms are composed of quadrangular joints, with parallel 

 sutures, and they possess a deep ventral furrow. The column is 

 circular, and consists of thick joints, those at the upper end 

 being comparatively strong, but they are reduced very soon to 

 less than one half of their greatest width. 



The only known species is : 



*1838. Stylocrinus tabulatus (Goldf.), Platycrinus tabulatus, Nova Acta. Leopold. 



xix, i, p. 345. Quenstedt, Handb. d. Petrefactenk. (Ed. 1), p. 618, PL 54, 



fig. 25. Symbathocrinus tabulatus, Miiller, 1855, Verb, naturh. Verein f. 



Rheinl. xii, p. 19, PI. i, figs. 4, 5 ; Schultze, 1866, Monogr. Eifl. Kalk., p. 



27, PI. 3, figs. 4, 5. Devonian. Eifel, Germany. 

 Var. alta Miiller, Verein f. Rheinl. xii, PI. 4, fig. 5; Schultze Monogr., PL 3, 



fig. 4. 

 Var. depressa Miiller, ibid., PI. 4, fig. 4; Schultze, ibid., PI. 3, fig. 5. 

 Si/n. Platycrinus laevigatus Goldf.; P. alutaceus, P. scrobiculatus, P. nodu- 



losus. These names were applied by Goldfuss to specimens in the Museum 



of Bonn to mere variations of Stylocrinus tabulatus, but have never been 



published (Schultze). 

 Syn. Stylocrinus scaber Sandberger, Versteinerungen Nassau's, p. 400, PI. 



35, fig. 12. 

 Syn. Platycrinus gerolsteiniensis Steininger, Geogn. Beschreib. d. Eifel, 



p. 37. 



STORTINGOCRINUS Schultze. 



1866. Monogr. Echin, Eifl. Kalk., p. 69. 



Syn. Platycrinus (partim), Goldfuss and Wirthgen and Zeiler. 



Stortingocrinus agrees in the lower portions of its calyx with 

 Platycrinus^ to which it was referred by Goldfuss and Miiller. 

 That it does not belong to the Camarata, and hence is no Platy- 

 crinoid, is shown by the mode of articulation, which is like that 

 of HaplociHnus, and by the form of the radials, which, in the 

 place of being notched, are extended upward, and support upon 

 their limbs a sing-le interradial as those of the Blastoids. 



Generic Diagnosis. Basals three, unequal; two of them twice 

 the size of the third one, which is rhomboidal. Radials large, 

 subquadrangular ; their articular facets deeply inserted, forming 

 a depression with a slightly concave upper face. Their lateral 

 margins of adjoining radials are connected by suture, they extend 



