195 



but in the Derbyshire encrinite, as far as can be judged from this 

 specimen, hardly any two of the arms divide alike. Indeed, so irre- 

 gular is their division, as to render it very difficult to give an idea of 

 it by words. In some of the arms the division takes place very low, 

 even at the third, and in others not until they have reached the se- 

 venth or eighth articulation. Unlike, too, to what takes place in the 

 lily encrinite, the fingers, which are formed by this division, divide 

 and subdivide, and that, apparently, not in any particular order; one 

 of the fingers of the same arm appearing to pass undivided to its 

 termination, whilst its fellow finger suffers a still further division. 

 How many divisions actually take place before their termination is 

 completed, cannot be determined by the present specimen, since full 

 a third part of it is concealed by being immersed in its matrix; nor 

 can any thing be said of its tentacula, excepting that analogy will 

 lead us to conclude that they are nearly alike in form and arrange- 

 ment to those of the lily encrinite. 



I had already remarked, that the contour of the pentagonal base of 

 this species which I had first noticed, Plate XV. Fig. 2, differed from 

 that of the lily encrinus in being more rounded ; and by the specimen 

 of Mr. Stevens, it is-seen that this circumstance results from its adap- 

 tation to the general form of this species, which is characterised by its 

 rounded and pyriform figure. 



"With respect to the lower extremity of this species, I do not know 

 that any conjecture has been made, as to the form it assumes : I, how- 

 ever, have some reason for suspecting that the spathose fossil, 

 Plate XIV. Fig. 5, is a polished section of this part. It was originally 

 in the collection of Mr. Strange, but where it was obtained from I 

 have had no opportunity of knowing. 



This fossil has been longitudinally divided, so that the section 

 shews a trunk, which seems to have been transversely divided, at small 

 distances, and from which appear to have proceeded cup-formed la- 

 mellae, disposed like those of a truncated bulb. These have been 



