KIAGARA GKOUP. 



211 



Fig. i d. A scapular plate enlarged, showing the elongated tubercular ornament. 

 Fig. 4 e. The large costal or intercostal plate enlarged, and showing the peculiar arrangement 

 of the tubercles upon its surface. 



Position and locality. This specimen was found in the same position, and associated with 

 the preceding species at Lockport. 



598. 2. EUCALYPTOCRINUS PAPULOSUS (w. sp.)- 



Pl. XLVII. Fig. 5 a, b. 

 Compare Eucalyptocrinut decorus, ut supra. 



The structure of the fragment figured shows no deviation from E. decorus, and is probably 

 only a variety of that species, having some peculiarity in its external characters or surface 

 ornament. 



Fig. 5 a. A fragment of the cup, having the base and arms broken off. It presents some pecu- 

 liarities in its surface markings ; many of the plates having rows of granules or 

 minute tubercles arranged along their margins, and parallel to the same. There are 

 also round or oval depressions with raised margins, many of them penetrating the 

 plates. These depressions, or pore-like orifices, are indiscriminately scattered over 

 the surface, sometimes near the junction of the plates, or in the line of separation, 

 and sometimes at a distance from the margins. The irregularity of their arrange- 

 ment induces hesitation in regarding them as pores communicating with the interior. 



Fig. 5 b. Several of these plates enlarged, showing more distinctly the arrangement of tubercles 

 and pore-like openings mentioned above. The form of this cup is more spreading 

 from the base upwards, than any specimen that has fallen under my observation. 



Position and locality. This fragment was found in the Niagara shale at Marshall's mill, in 

 the town of Sweden, Monroe county. 



In a paper recently read before the American Association for the Advancement of Science, 

 giving a list of the Fossil Crinoids of Tennessee, by Prof. Troost of Nashville, ten species are 

 given under the Genus Eucalyptocrinites, viz. E. splendidus, ovalis, extensus, Icevis, phil- 

 lippsii, goldfussii, nashvillce, conicus, tennesssex, and gibbosus. It seems to me very probable, 

 from the names of some of these, that specimens which I have regarded only as varieties 

 are given the rank of species. It is certainly very remarkable that so large a number of species 

 of a genus having the singular structure of Eucalyptocrinus should be found in one region. 

 The entire list, however, shows a most remarkable development of this family within the limits 

 of Tennessee. Unfortunately the geological position of these fossils is not given, and we can 

 only infer that they are from the strata embraced between the base of the Silurian and the 

 upper part of the Carboniferous systems inclusive. 



