NO. 1850. KNOBSTONE CRINOID FAUNA— SPRINGER. 193 



EURYOCRINUS Phillips. 



This genus was described from the Lower Carboniferous of York- 

 shire, England. It has since been recognized in the Devonian of 

 this country, and a well-defined species is now found in the Knob- 

 stone beds of Whites Creek and the Knobs of Kentucky and Indiana. 



SYNBATHOCRINUS Phillips. 



1. S. rohustus Shumard.^ Originally described from Button-mould 

 Knob, where the author says it is ''rather abundant in the blue marl 

 layers, interstratified with the fine grained sandstone." It is listed 

 as from the Keokuk Group by Worthen,^ Wachsmuth and Springer,^ 

 Miller,* and Weller.^ It is an abundant and widely distributed 

 species, notable for being, when mature, the largest of the genus. 

 I have it from Palmer's farm, Clark County, Indiana; Button-mould 

 and Bradbury Knobs, and Bradfordsville, Kentucky; and Whites 

 Creek, Tennessee. At Whites Creek we find it in both the reddish 

 and bluish preservation, and in place in the grey Knobstone beds, 

 but not in the Keokuk beds above. Worthen's specimen, figured 

 in Geological Survey of Illinois, vol. 6, plate 29, was from Greene 

 County, Illinois, where Kinderhook, Burlington, and Keokuk are all 

 present, although the Kinderhook is said to be nonfossiliferous. It 

 is possible, however, that it came from the Keokuk beds, and is an 

 unusually large example of S. swallovi, which occurs in the Keokuk 

 and Warsaw. Synhathocrinus is one of the genera wliich persists 

 through the crinoidal formation with but little change, and species 

 from the different horizons are often hard to distinguish. It is to be 

 noted, however, that the specimens of this genus occurring at un- 

 doubted Keokuk localities in southern Indiana and Kentucky are 

 invariably much smaUer than S. rohustus, and this species has not 

 been found at any locality where the Knobstone beds do not occur. 

 The genus begins in the Devonian, occurs abundantly in the Lower 

 and Upper Burlington of Iowa and Missouri, culminating in the latter, 

 and becoming extinct in the Warsaw. It is found in the Lake Valley 

 beds of New Mexico, and the Mountain Limestone of England; a 

 species is described by Wetherby from the Kinderhook beds at Kings 

 Mountain Tunnel, Kentucky, and one by HaU from the Goniatite 

 Limestone (Kinderhook) of Rockford, Indiana. 



Locality. — As above stated. 



2. S. angularis Miller and Gurley,^ is described from Button-mould 

 Kjiob, as Keokuk. A small form with more angular plates than the 

 last, but found associated with it, and perhaps only its younger stage. 



1 Trans. Acad. Sci. St. Louis, vol. 2, 1866, p. 397. ^ North Amer. Geol. and Pal., 18S9, p. 285. 



2 Geol. Sur\'. lUinois, vol. 6, p. 514. 6 Bull. 153, U. S. Geol. Surv., p. 618. 



3 Rev. Pal., vol. 3, p. 169. 6 BuU. No. 5, Illinois State Mus., p. 42. 



94428°— Proc.N .M.vol.41— li 13 



