1885.] NATURAL SCIENCES OF PHILADELPHIA. 337 



traces of ambulacra, which were probably hidden within the clefts, 

 and parti}' covered by the interradials, instead of being placed, as 

 we had supposed, on a level with them. A similar position was 

 probably occupied by the central plate, which, in our opinion, 

 formed the bottom part of the central space. 



We have but little doubt that the conditions of Coccocrinus 

 rosaceus were essential!}' the same as those of G. bacca; in the 

 former, however, the outer interradials were not preserved, having 

 been probably extended out to the free rays, as, more or less, in 

 the case of all discoid species of Platycrinus. That the}' were 

 present is indicated by the irregular width of the lateral clefts, 

 which, as seen in the specimens, suddenly widen on approaching 

 the arm bases, while they should rather grow narrower if repre- 

 senting the clefts between the orals in Holopus, as which they 

 were regarded by Carpenter. 



CORDYLOCRINUS Angelin, Rev. ii, p. 60. 



MARSUPIOCRINUS Phillips, Rev. ii, p. 62. 

 Additional species : — 



*1S75. M. praematurus (Hall), Platycrinus praematurus, Geol. Rep. Ohio, Palseont. 

 ii, p. 124, PI. 6, figs. 3-6.— Niagara gr. Green Co., 0. 



PLATYCRINUS Miller, Rev. ii, p. 65. 



PI. discoideus Hall, 1858, not Owen and Shumard, 1850. = Eucladocrinus 

 pleuroviminus White. 



Additional species not noted before : — 



1882. P. monroensis Worthen, Rull. i, 111. State Mus. Nat. Hist., p. 30; also Geol. 

 Rep. Ills, vii, p. 306, PI. 30, fig. 9. —St. Louis limest. Monroe Co., III.— We 

 have but little doubt that Prof. Worthen described here a young specimen of 

 P. bonoensis White. 

 1838. PI. coronatus Goldfuss, Nova Acta, Leop. xix, i, p. 344, PI. 31, fig. 8.— Car- 

 boniferous. Bristol, Engl. 



PL bloomfieldensis S. A. Miller, syn. of Platycrinus planus O. and Shum. 



PL poculum S. A. Miller. Too imperfect for identification. 



PL vesiculus McCoy, Rev. ii, p. 76, read PL vesiculosus. 



PL praematurus Hall & Whitf. = Marsupiocrinus praematurus. 



EUCLADOCRINUS Meek, Rev. ii, p. 76. 



COTYLEDONOCRINUS Cass and Lyon, Rev. ii, p. 77. 

 23 



