THE CRINOIDEA 



201 



Rhipidocrinus, Zittel (1879, ex Beyrich, MS.), Devonian, Germany, has 

 stout uniserial rami giving off biserial ramuli on alternate sides. Acantho- 

 crinus, C. F. Roemer (1850, em. Jaekel, 1895), Devonian, Germany, does 

 not differ greatly from the next genus. Rhodocrinus, J. S. Miller (1821, 

 restricted W. & Sp., 1881), Carboniferous and (?) Devonian, Europe and 



As 



FIG. CXXVll. 



Gilbertsocrinus. 1, G. lyonanus (=G. dispansus, W. & Sp.), ventral view, showing the 

 tegminal appendages and the proximal portions of the arms emerging from beneath them. 

 2, G. tuberculosus, the appendages mostly broken off, but more of the arms preserved. 3, G. cal- 

 caratus, showing how the appendages of the European forms are double where they issue from 

 the teginen. 4, G. typus, patina from below ; ap, tegminal appendages ; op', their points of 

 origin, showing central canal ; Ax, primaxil ; Br, pinnulate arms, which issue from the dorsal 

 cup at Br'. Other letters as usual. (All after Wachsmnth & Springer.) x 3. 



N. America ; has a vertical series of anals and isotomous arms, all the 

 free parts of which or only the finials are biserial. Condylocrinus, 

 Eichwald (1859, em. Tschernyschew, 1893), Lower Devonian, Ural, 

 differs, if at all, in iBr series, which runs 1, 1, 2, 3. Ophiocrinus, 

 Salter (1856 ; non Charlesworth, nee Semper, nee Angelin), Devonian, 

 S. Africa, has numerous iBr and several illBr ; IIIBr free and in zigzag. 

 Gilbertsocrinus, Phillips (1836; synn. Ollacrinus, Cumberland MS.; 

 Goniasteroidocrinus, Ly. & Cass. ; Trematocrinus, Hall), Devonian and 

 Carboniferous, Europe and N. America (Fig. CXXVll.), distinguished by 

 small pendent arms, and large, branching, horizontal, hollow extensions 

 of the interambulacral areas of the tegmen, of uncertain function. 



The following incorrect or indeterminable Names may be added to those 

 already quoted as synonyms or incertac sedis : 



Adelocrinus, Phillips (1841), Devonian, Britain, is probably syn. of either 



Hexacrinus or Arthracantha (see Whidborne, 1899). 

 Allionia, Michelotti (1861), syn. of Antedon. 

 Aporocrinus, Austin (1842), is an Agelacrinid, fide label on A. gyratus in 



Bristol Museum. 



Aspidocrinus, Hall (1859), Silurian, New York ; encrusting root of a crinoid. 

 Asteria, Auctt. vett., a Pentacrinoid columnal ( = Pentacrinos, Agricola). 

 Asterias, Linn, pars (1758) ; syn. of Antedon and Actinometra. 

 Asteriatites, Schloth. (1813) ; A. pennatus and A. rosaceus, syn. of Antedon. 

 Asterocrinus, Miinster (1838), "aus dem Orthoceratiten-kalk bei Elbersreutb," 



if a Crinoid at all, is an Inadunate. 



