106 PROCEEDINGS OF THE ACADEMY OP [1886. 



1838. C. elongatus Goldfuss, Nova Acta Ac. Leopold, xix, Pt. 1, p. ^?il, PI. 30, fig. 2. 

 Miinster, 1839, Beitr. d. Petrefactenk., p. 3, PI. i, figs. 1 a, b. D'Orbigny, 

 1850, Prodr. i, p. 102. Schultze, 1866, Mon. Echin. Eifl. Kalk., p. 23, PI. r^, 

 fig. 1. Dujardin and IIup6, Hist, natur. Zooph. Echin., p. 112. Devonian. 

 Eifel, Germany. 

 Syn. C. gerolsteinensis Stein, 1849, Verst. d. Eifel, 1849, p. 20. 

 St/n. C. prismatious Stein, 1849, ibid., p. 20. 

 Syn. C. elongatus Stein, Geogn. Beschreib. d. Eifel, p. .">6. 

 1826. C. gracilis Goldfuss, Petref. Gernaaniae, i, p. 213, PI. 64, fig. 5 : also Nova 

 Acta Ac. Leopold, xix. Pt. I, p. 334, PI. 30, figs. 5 or, ft, c (not b d). Steininger, 

 1849, Versteiner. d. Eifel, p. 20. D'Orbigny, 1850, Prodr. i, p. 1 02. Dujardin, 

 and Hupe, 1862, Hist. nat. Zooph. Echin., p. 113. Schultze, 1866, Mon. 

 Echin. Eifl. Kalk., p. 23, PI. 3, fig. 2. Devonian. Eifel. Germany. 

 1866. C. hieroglypMcus Schultze, Mon. Echin. Eifl. Kalk;, p. 25, PI. 1, fig. 3. 



Devonian. Eifel, Germany. 

 1866. C. inflatus Schultze, Mon. Echin. Eifl. Kalk., p. 24, PL 1, fig. 2. Devonian. 



Eifel, Germany. 

 1866. C. scaber Schultze, Mon. Echin. Eifl. Kalk., p. 25, PI. 1, fig. 4. Devonian. 

 Eifel, Germany. 



Family XVI. GASTEROCOMIDJE. 



The Gasterocomidse embrace the following genera : Gastero- 

 coma, Nanocrinus and Myrtillocrinus. They were united by 

 Pictet and by Dujardin and Hup^, with the Haplocrinidse ; Roemer, 

 Schultze, Zittel and De Loriol, however, treated them as a sepa- 

 rate family. 



GASTEROCOMA Goldfuss. 



1838. Goldfuss, Nova Acta Ac. Leopold, xix, 1, p. 350. 



1853. Steininger, Geogn. Beschreib. d. Eifel, p. 38. 



1857. Miiller, Neue Echin. Eifl. Kalk., p. 257. 



1857. Pictet, Traite de Paleont., iv, p. 314. 



1862. Dujardin and Hupe, Hist, natur. des Zooph. Ecliin., p. 109. 



1866. Schultze, Mon. Echin. Eifl. Kalk., p. 95. 



1879. Zittel, Handb. d. Palseont., i, p. 863. 



Syn. Ceramocrimcs Miiller, 1855, Verb, naturh. Virein f. Rheinlande, 

 xii (n. ser.), p. 83. 



Syn. Epactocrinus Muller, 1855, ibid., p. 84. 



Gasterocoma was described by Goldfuss to be composed of five 

 basals and five radials, the latter as enclosing laterally an anal 

 plate, and the anal opening as being located next to the posterior 

 basal. This definition, although substantially correct, was after- 

 wards modified by Schultze. He found that among species, and 

 even among individuals of the same species, the construction of 

 the azygous side undergoes most remarkable variations ; such as 

 in other groups would be sufficient for generic separation. The 



