BEVISION OF PALEOZOIC STELLEROIDEA. 261 



Genus FURCASTER Stlirtz. 



Furcaster Sturtz, Palseontographica, vol. 32, 1886, p. 79; N. Jalirb. fiir Min., 

 etc., 1886, vol. 2, p. 148; Verh. naturh. Ver. preusa. Rheinl., etc., vol. 50, 

 1893, p. 25.— Gregory, Proc. Zool. Soc. London for 1896, 1897, p. 1038; 

 Treat. Zool., vol. 3, Echinoderma, 1900, p. 275, fig. 31. 



Disk small, circular. Rays five, short, narrow, tapering gradually, 

 and slightly flexible. Actmally flat and abactmally rounded. There 

 is a dorsal median column of slightly projectmg plates and two lateral 

 ranges of side plates. The dorsal plates are medially depressed, with 

 their outer sides extended into ears, into which fit the spine-bearing 

 side plates. 



"Ambulacral ossicles [opposite] of a long central body and two 

 short wings, which are attached only to the anterior corner of the 

 ossicle." (Gregory.) Buccal scutes small. 



Genoliolotype. — F. palseozoicus Sturtz. F. (?) daoulasensis (Davy) 

 may also belong here. 



Remarl:s. — ''In Stiirtz's description he refers to the existence in 

 this genus of ventral arm plates, and even figures them. His type- 

 specimens are now in the British Museum, but I can not veiify the 

 existence of any ventral arm plates." (Gregory.) 



FURCASTER PAL.EOZOICUS Sturtz. 



Furcaster paheozoicus Sturtz, Pateontograpliica, vol. 32, 1886, p. 79, pi. 8, 

 figs. 4, 5; N. Jahrb. fiir Min., etc., 1886, vol. 2, p. 148; Palseontographica, 

 vol. 36, 1890, p. 214.— Gregory, Proc. Zool. Soc. London for 1896, 1897, 

 p. 1038. 



Formation and locality. — In the Lower Devonic roofing slates, 

 Bundenbach, Germany. There are three specimens of this species 

 at Yale University. 



Cat. No. 59383, U.S.N.M. 



FURCASTER (?) DAOULASENSIS (Davy). 



Protaster daoulasensis Davy, Bull. Soc. geol. France, ser. 3, vol. 14, 1887, pp. 182- 

 187, text figs.— Gregory, Proc. Zool. Soc. London for 1896, 1897, p. 1038, 

 footnote ("is an ally of Furcaster"). 



Formation and locality. — From the Lower Devonic, Rumguen, near 

 Brest, France. 



Genus PALASTROPECTEN Sturtz. 



Palastropedcn Stijutz, Palseontographica, vol. 32, 1886, p. 88, pi. 10, figs. 3, 4; 



vol. 36, 1890, p. 213, pi. 26, figs. 12, 13.— Gregory, Proc. Zool. Soc. London 



for 1896, 1897, p. 1038. 

 Palxspondylus Stijrtz, Verh. naturh. Ver. preuss. Eheinl., etc., vol. 56, 1900, 



p. 190. 

 Palseospondi/lu^ StUrtz, Verh. naturh. Ver. preuss. IlhoiuL, etc., vol. 56, 1900, 



pp. 191, 202. 



Diagnosis hy Gregory. — "Disk circular, large (badly preserved in 

 the specimens; probably originally soft and irregular), ^ii'ms thick, 



