1888.] NATURAL SCIENCES OF PHILADELPHIA. 387 



Zittel, Handb. d. Palreont., I., p. 357, fig. 244.-1885, Quen- 



stedt, ( Cyathocrinus, rugosus), Handb. d. Petrefactenk., IV, p. 



943, fig. 349.— 1886. W. and Sp., Rev. Palreocr., Pt. Ill, p. 



150. 



Upper Silurian. Gothland, Sweden and Dudley, Eng. 

 1878. Crotalocrinus superhus Angelin, Iconogr. Crin. Suec., p. 26, 



PI. XVII, figs. 2, 2 a, b.— 1886, W. and Sp., Rev. Palseocr., 



Pt. Ill, p. 150. 



Upper Silurian. Gothland, Sweden. 

 Crotalocrinus (undescribed species). PI. Ill, fig. 4 (Referred by 



Angelin, PI. XVII, figs. 3, 3 a, b, to C. rugosus). 



Upper Silurian. Gothland, Sweden and Dudley, Eng. 



ENALLOCRINUS D'Orbigny. 



1850. D'Orbigny, Prodr. d. Pal., 1., p. 46 ; Cours. elem., II, p. 142. 



1854. Salter, apud Murchison, Siluria, (3rd Ed.), p. 247. 



1857. Pictet, Traite d. Pal., IV., p. 320. 



1862, Dujardin and Hupe, Hist. nat. Zooph. Echin., p. 134. 



1878. Angelin, Icon. Crin. Suec, p. 25. 



1879. Zittel, Handb. d. Pal., I., p. 356. 



1886. Wachsmuth and Springer, Rev. Palaeocr., Pt. Ill, p. 150. 



Syn. Apiocrinites (Hisinger) in part ; 



Millericrinus (D'Orbigny) in part ; Anihocrinus (Quenstedt) in part. 



Generic Diagnosis. — Calyx similar in fiorm and construction to 

 that of Crotalocrinus; interradials sometimes appearing dorsally. 

 Arms not reticulate. 



First radials wide, their distal faces usually occupied by a deep 

 lunate excavation in Avhich the second primary and one or two higher 

 radials rest ; sometimes, however, truncate. Second primary and 

 higher radials inserted and connected as in Crotalocrinus, curving 

 upward and appearing on the ventral side in a similar way. Rays 

 completely disconnected from the first radials up, and the arms be- 

 coming free variously between the first to the fourth bifurcation. 

 Second radials perforated by a large axial canal which passes down- 

 ward ; it ramifies within the higher radials, and passes into the 

 arms, but apparently does not extend to their full length. 



Arms uniserial, very long, tapering little, bifurcating at lengthen- 

 ing intervals toward the upper parts into very numerous equal 

 branches, the ultimate divisions being extremely attenuate ; the arms 

 capable of being spread out horizontally. Arm joints shorter than 

 in Crotalocrinus, with parallel sutures; those of adjacent branches 



