The Crinoidea of the Lower Niagara Limestone. 305 



This species is readily distiiig-uisherl by its coarse granules or 

 nodes which coalesce and form ridges or striae towards the maruins 

 of the larger plates to meet corresponding ones from the plates 

 adjoining; and the strong radial ridges being comparatively smooth 

 above the primary series. In the primary radials the granulations 

 and rugae extend somewhat upon them. 



From the Lower Niagara Limestone, Lockport, N. Y. 



Quite a number of bases and parts of the sides have been found, 

 but no entire calyx as yet. Subgen. Eucrinus differs from Glyp- 

 taster only in the possession of a tertiary series of radials. Wachs- 

 muth and Springer give no American species in their list, and no 

 other publication of one has fallen under my observation. 



Icttayocriiilis conoideiis n. sp. PL III, fig. 5. — Calyx inverted coni- 

 cal, evenly tapering by straight sides to the broad base ; almost circular in 

 section, there being just the faintest suggestion of angularity radially. Arms, 

 column, etc., unknown. Sub-basals three, entirely hidden by column. Basala 

 five, with just the outer angles presenting beyond the base. The lower angle 

 of the radial opposite the smaller sub-basal extending upon the base. 



Three series of primary radials can be observed in the type 

 specimen ; they are of the usual form, with a smooth or minutely 

 granulose surface ; two of the series contain three successive radials, 

 while the other has four; above each primary series the first primary 

 radials are preserved. In another specimen there are four secondary 

 series of three each. 



This species is readily distinguished from I. Isevis, of the shales, 

 by its elongate calyx with straight sides and its proportionately 

 broader base. 



From the Lower Niagara Limestone, Lockport, N. Y. 



£llcalyptocrinils miiralis n. sp. PI. Ill, fig. 3. — Calyx inverted 

 conical ; sides nearly straight, but slightly curved outwards ; base well 

 defined, about twice as wide as the excavation for the reception of the column. 

 Surface covered with coarse, closely arranged, and at times coalescing, gran- 

 ules witJi spreading bases, and which are but slightly raised above the general 

 surface of the plates, and seem to be without any definite arrangement into 

 radiating lines, as is usually the case in this genus. Column and arms un- 

 known. Basal plates hidden from view by the retention of a joint of the 

 column. First radial plates large and evenly rounded in at the base to the 

 excavated portion, where they are abruptly bent upwards forming its perpen- 

 dicular walls. The rest of the plates are of average size and construction, and 

 have the outer face convex, evenly rounded up from the sharply defined suture 

 lines. 



