388 PROCEEDINGS OF THE ACADEMY OF [1888. 



opposite each other not alternating. Toward the upper ends of the 

 arm joints there are more or less conspicuous transverse projections 

 — one from each side of the joint — which are more prominent and 

 elongate at the ventral side. They border the arm furrow, and give 

 to the arm, when viewed from the side, a pectinate appearance, 

 which is more strongly marked toward the distal ends of the arms 

 (PL XX, tigs (jLil). Ambulacral farrows shallow, with covering 

 plates arranged in the usual way. ^ 



Vault apparently similar to that of Crotalocrinus ; median part 

 unknown ; ambulacra toward the periphery roofed over by convex 

 alternating pieces having the form of vault plates, which pass out 

 over the arms. Anal opening unknown. 



Column round, very large, with short joints and thin walls; canal 

 round and of extremely large size. 



Geological Position, etc. Upper Silurian of Sweden and England. 

 List of Species : — 

 1878. Enallocrinus assulosus Angelin, Icon. Crin. Suec, p. 26, PL 



XV, figs. 1 — 4. Upper Silurian, Gothland, Sweden. 

 1828. E. scriptus Plisinger (CyathocrinitesT), Anteckn IV, p. 217; 

 PL V, fig. 9 ; PL VII, fig. 1.— 1831. {Apiocriiiites (?) scrip- 

 tus), Anteckn V, p. 123, Esquisse d'un tableau des Petref. 

 de la Su6de, p. 23.— 1837. Leth. Suec, p. 89, PL XXV, figs. 

 1 and 2. — D'Orbigny, 1840 (Miller icrinus scriptus), Hist. 

 Nat. Crin., p. 94, PL XVI, fig. 29.— 1850. Prodr. d. Pal., I, 

 p. 46. — Angelin, 1878, Icon. Crin. Suec, p. 25, PL VII, figs, 

 1— 3a; PL IX, figs. 18 and 19 ; PL XXV, figs. 1—7 ; PL 

 XXVII, figs. 17— 20a. 



Syn. — Enallocrinus punetatus Hisinger, Leth. Suec, p. 89. — 

 3filler icrinus punetatus D'Orbigny, Hist. Xat. Crin., p. 94, 

 PL XVI, fig. 30. — Enallocrinus punetatus Salter, apud 

 Murchison, Siluria, (Ed. 2), j). 218. — Anthocrimis scriptus 

 and A. punetatus, Quenstedt, Handb. d. Petref, IV, p. 944, 

 PL 75, figs. 6, 7. 

 Upper Silurian. Gothland, Sweden and Dudley England. 



1 We have observed these projections on the arms only in the Enghsh specimens. 

 We give it as a generic character, as we think it hkely the Swedish ones will show 

 it also when sufficiently well preserved ; and because we consider it of some im- 

 portance, as representing the projections on the arms of Crotalocrinus by which 

 these M'ere connected, and thus exhibiting a tendency toward the reticulate struct- 

 ure. 



