T6 PROCEEDINGS OF THE ACADEMY OF [1886. 



small alternating side pieces, and covered along the median line 

 by two rows of saumpliittchen. 



Anal plate one, in line with first radials. Of the numerous 

 interradials only one or two are exposed dorsally, and these are 

 succeeded veutrally by an indefinite number of other vault plates. 

 Ventral tube lateral, its construction unknown. Column strong, 

 round, with short joints; axial canal large, round or obtusely 

 pentangular. 



Geological rosition, etc. Upper Silurian ; known only from 

 Gothland, Sweden. 



Two species have been recognized : 



3828. Enallocrinus scriptus Ilisinger (Cyathocrinites?), Anteckn iv, ji. 217: Tab. 

 V, fig. 9; Tab. vii, fig. 1. 1831. (Apiocrinites (?) scriptus), Anteckn v, p. 

 123, Esquisse d. tab. petrif. d. Swede, p. 23. 1837. Leth. Suec, p. 89, Tab. 

 XXV, figs. 1 and 2. D'Orbigny, 1840 (Millericrinus scriptus), Hist. Nat. 

 Crin., p. 94, PI. xvi, fig. 29. 1850. Prodr. d. Pal. i, p. 46. Angelin, 1878, Icon. 

 Crin. Suec,, p. 25, Tab. vii, figs. 1-3 a; Tab. ix, figs. 18 and 19; Tab. xxv, 

 figs. 1-7; Tab. xxvii, figs. 17-20 a. Upper Silurian. Gothland, Sweden. 

 Spi. Enallocrinus punctatus Hisinger, Leth. Suec, p. 89. Millei'icrinus 

 punctatus d'Orbigny, Hist. Nat. Crin., p. 94, Pi. xvi, fig. 30. Enallocrinus 

 punctatus Salter, apud Murchison, Siluria, Ed. 2, p. 218. Anthocrinus 

 scriptus and A. punctatus, Quenstedt, Handb. d. Petref. iv, p. 944, Tab. 

 75, tigs. 6, 7. 



1878. E. assulosus Angelin, Icon. Crin. Suec, p. 26, Tab. xv, figs. 1-4. Upper 



Silurian. Gothland, Sweden. 



CLEIOCRINUS Billings. 



1856. Geol. Surv. Canada, p. 276. 

 1859. Ibid, Decade IV, p. 52. 



1879. "Wachsm. and Spr., Rev. i, p. 35. 

 1879. Zittel, Handb. d. Pal., i. 357. 



Cleiocrinus in its general habitus has close aflfinities with the 

 Ichthyocrinidse and Crotalocrinidse^ and this has induced us to 

 place it provisionally with the Articulata, without assigning it to 

 any special family, although it diff'ers in two important points. 

 Cleiocrinus^ contrary to all other Articulata, has an interradial 

 in lateral contact with the first radials, forming a ring Avith them, 

 and the plates of the calyx apparently were not articulated in a 

 strict sense. Zittel has referred the genus to the Grotalocrinidse^ 

 while we placed it in Part I with the Ichthyocrinidse. If certain 

 parts were better known, we should make it the type of a new 

 family, but at present, having no positive knowledge of the 



