1886.] NATURAL SCIENCES OF PHILADELPHIA. 99 



was in our opinion perfectly justified in establishing for it a new 

 genus. 



1857. Triacrinus altus (Muller), Tricliocriinis altus, Neue Echin. Eifl. Kalk.. p. 249, 



PI. 2, figs. S-11. Schultze, 1SG6, Triacrinus altus, Echinod. Eifl. Kalk., p. 



109, PI. 12, fig. 9. Devonian. Eifel, Germany. 

 1857. T. depressus (Muller), Trichocrinus depressus, Xeue Echin. Eifl. Kalk., p. 249, 



PI. 2, tigs. 12-17. Schultze, 1866, Triacrinus depressus, Echin. Eifl. Kalk., 



p. 108, PI. 12, fig. 8. Devonian. Eifel. 

 1839. T. granulatus Miinster, Beitr. z. Petrefactenk., p. 4. Upper Silur. (?). 



Schiibekammer, Germany. 

 1839. T. granulatus Jliinster, type of the genus, Beitr. z. Petref., p. 3, PI. 1, figs. 



4 a, b, c. Devonian. Benitzlosau, near Hof, Germany. 



LAGENIOCRINUS De Kon. & Lehon. 



1853. De Kon. and Lehon., Recherch. snr les Crin. Carbon, de la Belg., 



p. 1S7. 

 1879. Zittel, Handb. d. Palseontologie, i.. p. 350. 



Zittel has placed Lageniocrinus along with Symbathocrinus and 

 Phimocrinus, and we think for good reasons. We also agree 

 with him that the five plates, which in the specimens cover the 

 ventral surface, represent the arms and not radials as was sup- 

 posed by De Koninck. These plates evidently could be opened, 

 and there were plates underneath covering the calyx. Lagenio- 

 crinus represents in our opinion an embryonic form, and may 

 possibly be the young stage of Symbathocrinus. Of this genus 

 we found a verv minute specimen, in which the arms consisted of 

 but three successive joints, forming jointly a pyramid : while 

 adult specimens sometimes have as many as a hundred. 



Generic Diagnosis. General form flagon-shaped ; that of the 

 dorsal cup funnel-shaped. Basals three, elongate, two of them 

 larsrer and pentangular, the smaller one rhomboidal, which 

 together form a tubular body which is slightly wider above. The 

 radials are quadrangular, wider above than below. Two of them 

 rest upon the truncate upper faces of the two larger basals, the 

 three others against their sloping sides and against the upper 

 s.AcS of the smaller basaL There is no anal plate. The arms 

 consist of single joints, which, folded together, form a pyramid. 

 The ventral surface of the calyx is not known. 



IS'AS. Lageaioeriftms seMisolas I^ Koa. asd Leltoa, Bediereli. car ks Ciim. CariMB. 

 4elkB^.,p.lS9, PL4fs.l-e. MooitaiB loMst. Tm^ 



