WHITEAVE5.] FOSSILS OP HA3IILT0N FORMATION OP ONTARIO. 99 



DOLATOCRINUS LAMELL08US, Hall. 



Cacabocrlnmlamellom.'!, Hall. ISGi'. Fifteenth Rep. N. York St. Cab. Nat. Hist., 



p. 141. 

 Dolatocrinm lametto.^u.^S. A. ililler. 1.S77. Cat. Am. Pal. Fos.s., p. 77. 



Wachsmuth and Springer. 1881. Rev. Palasocrinoidea, 



pt. 2, p. 126. 



Near Thedford, Eev. Hector furrie, LS82, teste Waclismutb one 

 nearly lierfect and tolerabl}' well preserved but S(jmewhat cru-lied 

 example of the calyx. 



DOLATOCRINTJS CANADENSIS. (X. Sp.) 



Plate 12, figs. 3, 3 a, 3 b, and 3 c. 



Calyx rather ^mall, sub-hemispherical, much broader than high . 

 " dor^ul cup ■ broadh' and shallowly basin-shaped but deeply concave 

 in the centre exteriorly ; dome moderately elevated, rather distinctly 

 pentalobate as viewed from above, the radial areas being slightly raised 

 and the interradial as slightly depressed. 



United basals small and forming a funnel-shaped concavity for the 

 reception of the column. 



First primary radials hexagonal, broader than high and broadest 

 above the middle, — almost completely sunk in the basal concavity. 

 Second primary radials quadrangular, much broader than high, rather 

 .smaller than the first and unlike them foi'ming part of the lateral wall 

 of the calyx. Third primary radials pentagonal, much broader than 

 high and a little broader than the second. On the upper sloping sides 

 of each third primary radial, there is a similarly shaped but much 

 smaller pair of secondary radials, or radials of the second order. On 

 its two upper sides each secondary radial to the right bears a pair of 

 still smaller tertiary radials while each one on the left bears a single 

 tertiary radial on its inner and upper side. These three tertiary 

 radials are quadrangular or hubquadrangular in outline, but their 

 ujjper margins are obliquely bevelled off and deeply omarginate in the 

 centre, in such a way as to form articulating bases, or portions of bases, 

 of attachment for the arms. In every ray, therefore, there were 

 originally three arms, two on the right .bide and one on the left, though 

 the arms themselves do not happen to be preserved in the only 

 specimen known to the writer. 



Interradials two : the first rather larger than the first primary radials, 



