THE CRINOIDEA 203 



Ganymeda, J. E. Gray (1834) ; centrodorsal of Antedon, apud L. Agassiz (1841). 



Gaurocrinus, S. A. Miller (1883), Ordovician, N. America ; referred by Wachs- 

 muth & Springer part to Reteocrinus, part to Ptychocrinus. 



Glenotremites, Goldfuss (1832), centrodorsal of Antedon. 



Gnathocrinus, T. & T. Austin, nom. nud. (1842). The genotype G. fusiformis 

 is proved by Austin's MS. drawings to be syn. of Millericrinus Pratti. 



Goldfussia, Norman (1891, non Castelnau, 1843), proposed for Comatula vel Corn- 

 aster multiradiata, Goldf. non Linn., ?iecLam., a quite unrecognisable form. 



Grammocrinus, Eichwald (1859), Ordovician ; columnals incertae sedis. 



Halophenix "of our British Museum," fide Cumberland (1826); syn. of 

 Pentacrinus. 



Helmintholithus cntrochus, Linn. (1768) ; stems of various Palaeozoic Crinoids. 



Helmintholithus portentosus, Linn. (1768); syn. of Pentacrinus. 



Hertha, v. Hagenow (1840) ; centrodorsal of Antedon. 



Icosidactylocrinus, D. D. Owen, nom. nud. (1843) ; referred to Glyptocrinus by 

 Shumard (1866). 



Kallispongia, Wright (1877) ; larva of Antedon. 



Koninckocrinus, Seeley, nom. nud. (1864) ; syn. of Torynocrinus and Acrocliordo- 

 crinus. 



Medusacrinus, T. & T. Austin, nom. nud., fide Wachsmuth & Springer (1881). 



Microcrinus, Emmons (1858), Eocene, N. Carolina ; probably centrodorsal of 

 Atelecrinus. 



Mitrocrinus, Miller & Gurley (1894), Ordovician, Tennessee ; based on a six- 

 rayed individual, probably abnormal, and a Periechocrinid or Carpocrinid. 



Pachyantedon, Jaekel (1891), Upper Cretaceous, N. Germany. Based on impres- 

 sion of stout arms, and a few cirri ; Br and cirrals in zigzag. 



Pachycrinus, Eichwald (1840), Carboniferous, Russia ; columnals only, in part 

 a syn. of Platycrinus (see p. 132). 



Pachyocrinus, E. Billings (1859), Ordovician, Canada ; founded on a single base, 

 with no diagnostic features. 



Pentacjonites, Rafmesque (1 819), based on pentagonal columnals, probably of a 

 Heterocrinid. 



Perischodomus magnus, Tornquist (1894) ; syn. of Adelocrinus hystrix, Phill. 



Petinocrinus, Hall (1859), Geol. Iowa, vol. i. Suppl. p. 49. Not seen. 



PTiialocrinus, Eichwald (1860), Ordovician, Russia ; encrusting roots with ridged 

 under surface (see p. 133). 



PlatyspTiaerites, Trenkner (1868), doubtfully crinoidal. 



Proteuryale, J. Miiller ex C. F. Roemer MS. (1855) ; syn. of Cylicocrinus con- 

 fluentinus, apud Jaekel (1895). 



Pterocoma, L. Agassiz (1835) ; syn. of Antedon. 



Rhodocalix, Trenkner (1868), doubtfully Crinoidal. 



Shumardocrinus, Miller & Gurley (1895), based on imperfect specimens of 

 Steyanocrinus concinnus. 



Solacrinus, L. Agassiz (1835), for Solanocrinus, Goldf. (1832), which is syn. of 

 v Antedon. 



Sphenocrinus, Eichwald (1856), quinquepartite columnals. 



Sycocrinus, T. & T. Austin (1843 1 ) ; the authors' MS. drawings suggest that 

 S. dausus=Lageniocrinus, S. Jacksoni = Cryptoerinus, and S. anaiwpta- 

 menos = Hypocrinus. 



Syringocrinus, E. Billings (1859), Ordovician, Canada ; stem of Dendrocystis. 



Tetracrinus, T. & T. Austin, nom. nud. (1842, non Minister). Not known. 



