508 FOSSIL INVERTEBRATED ANIMALS. 



externally, the traces of articulations, the rays, nevertheless, 

 do not proceed to the circumference. These rays, which catch 

 in with those of the contiguous articulation, appear to have 

 been intended to hinder the stem from turning on itself; but, 

 considering the great number of articulations of which this stem 

 is composed, it is extremely probable that these polyparia had 

 a certain movement of rotation and of libration on their axis. 



There are some specimens, with very thick stems, found in 

 the island of Gothland, and at Pffeffingen ; but their species is 

 undetermined. That which is called lilium lapideum by Ellis, 

 and encrinus Ulii/ormis by Lamarck, is supported on a round 

 stem, of from ten to fifteen inches in length. The head, or 

 corona, of this species, is formed of ten bifurcated rays, which 

 have the form of the floAver of a closed lily when contracted. 

 These rays are supported on a piece, which has been named 

 the root of the rays ; so that two of these last have always a 

 common root. This root is attached to a part of a pentagonal 

 form, which has been named the base, and which is composed 

 of five pieces, often joined in one, by which the corolla is united 

 to the stem. This last is composed of articulations of different 

 forms : in the part most remote from the corolla, after six or 

 eight cylindrical articulations, which are smooth externally, one 

 is found more thick, and resembling a compressed musket-ball. 

 On the whole, there are many varieties in those stems. — There 

 are some which are channelled circularly ; some round and 

 smooth ; some with swellings of different thicknesses, which 

 alternate one with another ; some with gibbous or convex arti- 

 culations ; and others, with three slender articulations placed 

 between two more thick, &c. Encrini of these kinds are found 

 at Wessembourg, Lower Rhine ; in Saxony ; in Thuringia ; in 

 Silesia; in the environs of Frankfort on the Oder; in Switzer- 

 land ; at Dudley, in this country 5 and in many other places. 

 Figures of them may be seen in Ellis"*s work on Corallines, 

 and in that of Kruezz on Fossils, &c. 



At La Haye-du-Puits, department of the Manche, are found 



