444 



REMARKS ON NEW SPECIES OF CRINOIDEA, 



crinus liratus var. multilira (G. I. var. mnlt'dira), Dolatocrinus vox. intermedins (C var. inter- 

 medins), Ancyrocrinus bulbosus: all the above are Hall's species. EnletJierocrinus Casse- 

 dayi, Actinocrinus Gassedayi, A. Kentuekyensis Gyathocrinus sculptus, G. valens, G. leviculus, 

 and others; and several new, or not identified with any description. 



Pentremites of the carboniferous type, intermediate between P. florealis (Oodoni) and P. 

 pyriformis, Say, are obtained in this bed. These have not been identified. 



At the Bear Grass Quarries, where the covering of the lower horizon of crinoideans are 

 separated by the thin layer of hydraulic limestone, there is a partial mingling of the crin- 

 oidea of the two beds separated by it. JSfucleocrinus Verneuilli are found in the upper bed. 

 They are smaller, less robust, and differ very considerably from those obtained in the bed 

 below the hydraulic limestone at the Falls of the Ohio. 



From the year 1835 until 1867, fragments from the Nucleocrinus beds were added to 

 the collections made from year to year. They were generally parts of crinoidal bodies of 

 large size, pieces of bases, fragments from the middle of the body, fragments of the dome- 

 covering, &c. Until 1867 no specimen revealed the true structure of the calyx of any of 

 the species. No arms or parts of arms have ever been found attached to any of the species. 

 Columns of very large size, short, rapidly tapering from below upward, having many side 

 branches; often found clasping the column or other bodies, are associated with these 

 remains. These are provisionally referred to II. plenissimus. They do not belong to any 

 species of Dolatocrinus. The column has been found attached to the largest species found 

 in the horizon in which it occurs, and to many of the smaller species of Dolatocrinus occur- 

 ring either in the lower or upper beds ; all these are of an entirely different type. In the 

 general form and surface-markings, it most resembles Dolatocrinus, associated with it in 

 the same bed. The base of all the species known are deeply excavate. In Hadrocrinus 

 plenissimus the basal pieces are entirely hidden under the columnar facet. The first 

 radials, and part of the first radials of the second series, and the interradials of the first 

 series, 5re deeply implanted in the basal pit, or included within its margin. No specimen 

 that has been observed exhibits the basal pieces, if seen from the outside of the specimen. 

 All fragments, properly cleaned, that contains the base of the animal, will show the struc- 

 ture of the base, seen from the inside. 



The first radial pieces arc very large. In IT. plenissimus they differ greatly, both in 

 size and form. They all appear to be ray-bearing. No irregular side, analogous to the 

 asygos (anal) side, has been seen in any of the examples observed. 



It is no slight matter, in the present condition of our knowledge respecting these ani- 

 mals, to decide what may be differences of structure that have true generic significance. 

 These bodies will not fall into any genera as now defined. The general aspect is different 

 from all known genera and species that have been observed. 



