202 ORGANIC REMAINS. 



flatness may possibly originate in a difference of organization. — Two 

 belemnites, one large and the other small, are seen imbedded among 

 the portions of the encrinite; and in the other side of the stone is a 

 piece of petrified wood. 



No. 1 is part of a pentacrinite of an uncommon size, from the 

 aluminous beds near the north cheek of Robin Hood's Bay. The 

 •whole specimen exhibited a number of large branches, with many 

 smaller ones, lying in a confused state, and occupying several square 

 feet on the scar. Many of the branches, or arms, are above a quarter 

 of an inch in diameter, and some of them run nearly in a straight line 

 for about ten inches or a foot ; but most of them are bent, and not a 

 few distorted and broken. Thotigh its arms are less crowded than 

 those of No. 6, we may view it as the briaraean pentacrinite, especially 

 as it corresponds with the specimens given by Parkinson, Vol. II, 

 PI. XVII, Fig. 15 and 16, in having its strongest arms, or vertebral 

 columns, composed of thicker and thinner vertebrsE, placed alternately, 

 and forming curiously waved lines at their junction, greatly adding 

 to the external beauty of the columns. Like many of the pentacri- 

 nites, it does not display on its vertebrae a star with five points, but a 

 flower with five petals ; and the exterior profile of its column is not 

 pentagonal, properly speaking, but presents five rounded projections, 

 something in the way of the clustered pillars in Gothic buildings. 



Pentacrinites with sharp angled columns are more common in 

 our strata, but we generally find them in a very broken state. No. 2 

 exhibits a specimen of pentagonal stars, of the usual form. They 

 occur of various sizes, some of them being very minute. Encrinites 

 are also found, having very slender stalks and branches. An elegant 

 specimen of this kind, imbedded in a small nodule of limestone, is in 

 the valuable collection of Thomas Hinderwell, Esq., at Scarborough. 

 It was found on the beach near that place, among the stones washed 

 down from the alluvial cliffs. 



