3f>8 I'KoCEEDINGS OF THE ACADEMY OP [1885. 



the fourth ring, which form the upper part of the neck, are 

 generally composed of four plates, forming a tubular cavity, which 



is covered by small pieces surrounding the anal opening. There 

 are no Lateral extensions along these plates, but the upper end is 

 frequently provided with a thickened rim, sometimes, however, 

 extended into long spines, which are spread out horizontally. 



Arms twenty, not extending beyond the top of the tubular 

 neck; they are composed of two series of interlocking pieces, 

 and are provided with long pinnules, composed of six or more 

 elongate joints. The arms rest within the niches formed by the 

 braces, the greater portion of them remaining free. 



Column round, composed of rather long joints with a medium- 

 sized, apparently circular canal. 



Geological Position, etc. — Gallicrinus has been recognized only 

 from the Upper Silurian of Sweden ; it is possible, however, that 

 some of the casts described from the Niagara group of Wisconsin 

 represent this genus. 



1878. Callicrinus beyrichianus Angelin, Iconogr. Crin. Suec, p. 15, PI. 2, fig. 6. — 

 Upper Silurian. Gothland, Sweden. 



L837. C. costatus (Hisinger), Eugeniacrinites i ?) rostatus, Lethaea Suec., p. 90, PI. 30, 

 fig. 1 4 a I) ; D'Orbigny, 1850, Calliocrinus costatus ( Type of the genus), Pro- 

 drome i, p. 45; Angelin, 1878, Callicrinus costatus, Iconogr. Crin. Suec, 

 p. 15, PI. 1, fig. 6, and PI. 2, figs. 1-4: PI. 21, figs. 4, 5; also PI. 24, figs. 23- 

 26 ; PI. 28, figs. 19-22 and 24, 25; also PI. 29, figs. 1-26 and 65-68.— Upper 

 Silurian. Gothland, Sweden. 



1878. C. diadema Angelin, [conogr. Crin. Suec, p. 16, PI. 28, figs. 27, 27 a.— Upper 

 Silurian, (iuthland, Sweden. 



1878. C. koninckianus Angelin, Iconogr. Crin. Suec, p. 15, PI. 1, figs. 4, 4 a, and PI. 

 28, figs. 18-26.— Upper Silurian. Gothland, Sweden. 



1878. C. minor Angelin, [conogr. Crin. Suec, p. 16, PI. 25, tig. 15. — Upper Silurian. 

 i lothland, Sweden. 



1878. C. murchisouiauus Angelin, Iconogr. Crin. Suec, p. 15, PI. 1, fig. :;, and PI, 

 2S, lij^s. 11-17. — Upper Silurian. Gothland, Sweden. 



L878. C. rcbmerianus Angelin, Iconogr. Crin. Suec, p. 15, PI. 1. figs. 1,2, and PI. 

 28, fig. 23.— Upper Silurian. Gothland, Sweden. 



1878. C. sedgwickianus Angelin, [conogr. Crin. Suec., \>. 15, PI. 1, fig. 5. — Upper 

 nrian. ( rOthland, Sweden. 



