180 



PALEONTOLOGY OF MEW-YOEK. 



573. 2. GLYPTOCRINUS PLUMOSUS. 



Pl. a XLI. Fig. da-g. 

 Actinocrinusl plumosus. Geol. Rep. 4th Dist. N. York, 1843, p. 72. 



Body unknown ; fingers long, slender, and furnished with long, numerously jointed tentacula' ; 

 joints of the tentacula slightly longer than the joints of the fingers (the former being from J^ 

 to -f\, and the latter j\ to ^\ parts of an inch) ; column long, slender, obtusely five-angled, 

 consisting of alternating thicker and thinner joints ; sections of the column, or ends of the larger 

 joints roseate, and distinctly divided into five parts, each one bearing an impression. 



I have united the fragments of fingers and tentacula with the columns under the same species, 

 though having no positive evidence that they are identical. The joints of the fingers bear a close 

 resemblance to those of the column, and are evidently closely related, if not of one species. The 

 joints of the fingers and tentacula are very numerous. In the latter, I have counted twenty-seven 

 in an imperfect one. The columns are easily identified by the obtusely pentangular form and the 

 pentapetalous section. The joints are extremely numerous, and often entirely cover the surface 

 of some thin layers. The column is always longitudinally marked by a fine line or slit, in- 

 dicating the line of separation between the five parts of each plate. 



The character of the column and joints induces me to unite this species to the Glyptocrinxts, 

 since it is very clear that it is not an Actinocrinus, that genus being as yet unknown in the 

 Silurian or devonian periods of our country. 



Fio-. 3 c. A portion of a single finger, with the tentacula attached. . 



Fig. 3 b. Two joints of the finger enlarged, with several of the tentacular joints attached. 



Fig. 3 c. A fragment of the column, probably of the same species. 



Fig. 3 d. A few joints of the same enlarged, showing the longitudinal line of separation between 



the five parts of the plate. The same line is seen also in 3 c. 

 Fiof. 3 e. The end of the same column enlarged. 

 Fig. 3/. A small fragment of the rock, with the surface nearly covered with the joints of this 



crinoid. 

 Fig. 3 g. Several of these joints enlarged, showing their variable character. 



Position and locality. This species is but rarely seen in the group east of the Genesee river, 

 but becomes more abundant in the western part of the State. On the Oak-orchard creek south 

 of Medina village, the columns and joints are very abundant ; and also at Reynale's basin in 

 Niagara county, where the fingers and tentacula are also found associated. It likewise occurs at 

 Lockport. In all these localities, it is found in the lower part of the group. On the Niagara 

 river, and at other localities in Canada West, it is of extremely rare occurrence : its horizontal 

 range, therefore, appears to be quite limited. {State Collection. Collection of Col. Jewett.) 



