EETEOCRINID^. 179 



Reteocrinus fimbriatus Billings. 

 Plate IX. Fig, Jf. 



1859. E. Billings ; Geol. Rep. Canada, Dec. IV. p. 65, Plate 9, Eig. 3. 



1877. S. A. Miller; Catal. Amer. Palseoz. Eoss., p. 90. 



1881. W. and Sp.; Revision Palgeocr. Part II., p. 193. 



1883. W. and Sp. ; Amer. Journ. Sci., Yol. XXV., p. 266. 



1889. S. A. Miller; North Amer. Geol. & Palj»ont., p. 377. 



A small species of the type of Beteocrinus magmficus. Dorsal cup to the 

 top of the costals subpyramidal ; slightly more spreading from there upward. 

 The plates forming the rays rounded, and elevated conspicuously above the 

 interradial spaces. 



Infrabasals small, their upper angles and the adjoining lower angles 

 of the basals depressed into small pits surrounding the column. Similar 

 pits are formed in a radial direction by the basals and lower margins of the 

 radials. Costals two, as large as the radials. Distichals eight or more, 

 narrower than the costals, the lower one longer than wide, the length of the 

 succeeding ones gradually decreasing upwards. Six of them apparently are 

 included in the calyx, the others free arm plates. The upper distichal is 

 axillary, and supports two arms, one of which remains simple, while the other 

 bifurcates once more. The arms decrease but little in size ; they are cylin- 

 drical, composed of rather long pieces, quadrangular in outline, with nearly 

 parallel faces. Pinnules decidedly tapering to their distal ends. Inter- 

 radial spaces deep, paved by a large number of very small, slightly convex 

 pieces, without definite arrangement. There is generally but one plate in 

 contact with the basals, but its outlines are very irregular, and that is still 

 more the case with the succeeding plates, and the numerous interdistichals. 

 Form of ventral disk, and construction of the anal side unknown. Column 

 at its upper end sharply pentagonal, with re-entering angles. 



Horizon and Locality. — Hudson River group \ Charleton Point ; Anticosti. 



Type in the Canada Survey Museum. 



Reteocrinus Nealli (Hall). 

 Flate IX. Figs. la-f. 



1872. Qli/ptocrmm Nealli — TLkll-, 24tli Rep. N. Y. State Cab. Nat. Hist., p. 206, Plate 5, Pigs. 18 & 19. 



1873. Ghjptocrinus Onealli — Meek; Geol. Rep. Ohio, Palaeont., I., p. 34, Plate 2, Pigs, ^a, b, c, 



1881. Reteocrinus Onealli — W. and Sp.; Revision Palseocr., Part II., p. 193. 



1882. Glyptocrinm Nealli — S. A. Miller; Journ. Cincin. Soc. Nat. Hist., Vol. V., p. 37. 



1883. Reteocrinus Onealli — W. and Sp. ; Amer. Jonrn. Sci., Vol. XXV., p. 260. 

 1883. Gaurocrinus Nealli — S. A. Milleu; Journ. Cincin. Soc. Nat. Hist., p. 229. 



